AI prompts
base on A comprehensive, efficient, and reusable util function library of Go. <div align=center>
<img src="./logo.png" width="200" height="200"/>
<br/>
![Go version](https://img.shields.io/badge/go-%3E%3Dv1.18-9cf)
[![Release](https://img.shields.io/badge/release-2.3.4-green.svg)](https://github.com/duke-git/lancet/releases)
[![GoDoc](https://godoc.org/github.com/duke-git/lancet/v2?status.svg)](https://pkg.go.dev/github.com/duke-git/lancet/v2)
[![Go Report Card](https://goreportcard.com/badge/github.com/duke-git/lancet/v2)](https://goreportcard.com/report/github.com/duke-git/lancet/v2)
[![test](https://github.com/duke-git/lancet/actions/workflows/codecov.yml/badge.svg?branch=main&event=push)](https://github.com/duke-git/lancet/actions/workflows/codecov.yml)
[![codecov](https://codecov.io/gh/duke-git/lancet/branch/main/graph/badge.svg?token=FC48T1F078)](https://codecov.io/gh/duke-git/lancet)
[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/duke-git/lancet/blob/main/LICENSE)
[![Gurubase](https://img.shields.io/badge/Gurubase-Ask%20Lancet%20Guru-006BFF)](https://gurubase.io/g/lancet)
</div>
<div STYLE="page-break-after: always;"></div>
<p style="font-size: 20px">
Lancet is a comprehensive, efficient, and reusable util function library of go. Inspired by the java apache common package and lodash.js.
</p>
## <a href="https://www.golancet.cn/en/" target="_blank"> Website</a> | [简体中文](./README_zh-CN.md)
## Features
- 👏 Comprehensive, efficient and reusable.
- 💪 700+ go util functions, support string, slice, datetime, net, crypt...
- 💅 Only depends on two kinds of libraries: go standard library and golang.org/x.
- 🌍 Unit test for every exported function.
## Installation
### Note:
1. <b>For users who use go1.18 and above, it is recommended to install lancet v2.x.x. Cause in v2.x.x all functions were rewritten with generics of go1.18.</b>
```go
go get github.com/duke-git/lancet/v2 // will install latest version of v2.x.x
```
2. <b>For users who use version below go1.18, you should install v1.x.x. The latest of v1.x.x is v1.4.6. </b>
```go
go get github.com/duke-git/lancet // below go1.18, install latest version of v1.x.x
```
## Usage
Lancet organizes the code into package structure, and you need to import the corresponding package name when use it. For example, if you use string-related functions,import the strutil package like below:
```go
import "github.com/duke-git/lancet/v2/strutil"
```
## Example
Here takes the string function Reverse (reverse order string) as an example, and the strutil package needs to be imported.
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/strutil"
)
func main() {
s := "hello"
rs := strutil.Reverse(s)
fmt.Println(rs) //olleh
}
```
## Documentation
### <span id="index">Index<span>
- [Algorithm](#user-content-algorithm)
- [Compare](#user-content-compare)
- [Concurrency](#user-content-concurrency)
- [Condition](#user-content-condition)
- [Convertor](#user-content-convertor)
- [Cryptor](#user-content-cryptor)
- [Datetime](#user-content-datetime)
- [Datastructure](#user-content-datastructure)
- [Fileutil](#user-content-fileutil)
- [Formatter](#user-content-formatter)
- [Function](#user-content-function)
- [Maputil](#user-content-maputil)
- [Mathutil](#user-content-mathutil)
- [Netutil](#user-content-netutil)
- [Pointer](#user-content-pointer)
- [Random](#user-content-random)
- [Retry](#user-content-retry)
- [Slice](#user-content-slice)
- [Stream](#user-content-stream)
- [Structs](#user-content-structs)
- [Strutil](#user-content-strutil)
- [System](#user-content-system)
- [Tuple](#user-content-tuple)
- [Validator](#user-content-validator)
- [Xerror](#user-content-xerror)
<h3 id="algorithm">1. Algorithm package implements some basic algorithm. eg. sort, search. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/algorithm"
```
#### Function list:
- **<big>BubbleSort</big>** : sorts slice with bubble sort algorithm, will change the original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#BubbleSort)]
[[play](https://go.dev/play/p/GNdv7Jg2Taj)]
- **<big>CountSort</big>** : sorts slice with bubble sort algorithm, don't change original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#CountSort)]
[[play](https://go.dev/play/p/tB-Umgm0DrP)]
- **<big>HeapSort</big>** : sorts slice with heap sort algorithm, will change the original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#HeapSort)]
[[play](https://go.dev/play/p/u6Iwa1VZS_f)]
- **<big>InsertionSort</big>** : sorts slice with insertion sort algorithm, will change the original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#InsertionSort)]
[[play](https://go.dev/play/p/G5LJiWgJJW6)]
- **<big>MergeSort</big>** : sorts slice with merge sort algorithm, will change the original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#MergeSort)]
[[play](https://go.dev/play/p/ydinn9YzUJn)]
- **<big>QuickSort</big>** : sorts slice with quick sort algorithm, will change the original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#QuickSort)]
[[play](https://go.dev/play/p/7Y7c1Elk3ax)]
- **<big>SelectionSort</big>** : sorts slice with selection sort algorithm, will change the original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#SelectionSort)]
[[play](https://go.dev/play/p/oXovbkekayS)]
- **<big>ShellSort</big>** : sorts slice with shell sort algorithm, will change the original slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#ShellSort)]
[[play](https://go.dev/play/p/3ibkszpJEu3)]
- **<big>BinarySearch</big>** : returns the index of target within a sorted slice, use binary search (recursive call itself).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#BinarySearch)]
[[play](https://go.dev/play/p/t6MeGiUSN47)]
- **<big>BinaryIterativeSearch</big>** : returns the index of target within a sorted slice, use binary search (no recursive).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#BinaryIterativeSearch)]
[[play](https://go.dev/play/p/Anozfr8ZLH3)]
- **<big>LinearSearch</big>** : returns the index of target in slice base on equal function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#LinearSearch)]
[[play](https://go.dev/play/p/IsS7rgn5s3x)]
- **<big>LRUCache</big>** : implements memory cache with lru algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/algorithm.md#LRUCache)]
[[play](https://go.dev/play/p/-EZjgOURufP)]
<h3 id="compare"> 2. Compare package provides a lightweight comparison function on any type. <a href="#index">index</a> </h3>
```go
import "github.com/duke-git/lancet/v2/compare"
```
#### Function list:
- **<big>Equal</big>** : Checks if two values are equal or not. (check both type and value)
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/compare.md#Equal)]
[[play](https://go.dev/play/p/wmVxR-to4lz)]
- **<big>EqualValue</big>** : Checks if two values are equal or not. (check value only)
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/compare.md#EqualValue)]
[[play](https://go.dev/play/p/fxnna_LLD9u)]
- **<big>LessThan</big>** : Checks if value `left` less than value `right`.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/compare.md#LessThan)]
[[play](https://go.dev/play/p/cYh7FQQj0ne)]
- **<big>GreaterThan</big>** : Checks if value `left` greater than value `right`.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/compare.md#GreaterThan)]
[[play](https://go.dev/play/p/9-NYDFZmIMp)]
- **<big>LessOrEqual</big>** : Checks if value `left` less than or equal than value `right`.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/compare.md#LessOrEqual)]
[[play](https://go.dev/play/p/e4T_scwoQzp)]
- **<big>GreaterOrEqual</big>** : Checks if value `left` less greater or equal than value `right`.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/compare.md#GreaterOrEqual)]
[[play](https://go.dev/play/p/vx8mP0U8DFk)]
- **<big>InDelta</big>** : Checks if two values are equal or not within a delta.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/compare.md#InDelta)]
<h3 id="concurrency"> 3. Concurrency package contain some functions to support concurrent programming. eg, goroutine, channel, async. <a href="#index">index</a> </h3>
```go
import "github.com/duke-git/lancet/v2/concurrency"
```
#### Function list:
- **<big>NewChannel</big>** : create a Channel pointer instance.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#NewChannel)]
[[play](https://go.dev/play/p/7aB4KyMMp9A)]
- **<big>Bridge</big>** : link multiply channels into one channel.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/Bridge.md#NewChannel)]
[[play](https://go.dev/play/p/qmWSy1NVF-Y)]
- **<big>FanIn</big>** : merge multiple channels into one channel.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#FanIn)]
[[play](https://go.dev/play/p/2VYFMexEvTm)]
- **<big>Generate</big>** : creates a channel, then put values into the channel.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#Generate)]
[[play](https://go.dev/play/p/7aB4KyMMp9A)]
- **<big>Or</big>** : read one or more channels into one channel, will close when any readin channel is closed.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#Or)]
[[play](https://go.dev/play/p/Wqz9rwioPww)]
- **<big>OrDone</big>** : read a channel into another channel, will close until cancel context.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#OrDone)]
[[play](https://go.dev/play/p/lm_GoS6aDjo)]
- **<big>Repeat</big>** : create channel, put values into the channel repeatedly until cancel the context.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#Repeat)]
[[play](https://go.dev/play/p/k5N_ALVmYjE)]
- **<big>RepeatFn</big>** : create a channel, executes fn repeatedly, and put the result into the channel, until close context.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#RepeatFn)]
[[play](https://go.dev/play/p/4J1zAWttP85)]
- **<big>Take</big>** : create a channel whose values are taken from another channel with limit number.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#Take)]
[[play](https://go.dev/play/p/9Utt-1pDr2J)]
- **<big>Tee</big>** : split one chanel into two channels, until cancel the context.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/concurrency.md#Tee)]
[[play](https://go.dev/play/p/3TQPKnCirrP)]
<h3 id="condition"> 4. Condition package contains some functions for conditional judgment. eg. And, Or, TernaryOperator... <a href="#index">index</a> </h3>
```go
import "github.com/duke-git/lancet/v2/condition"
```
#### Function list:
- **<big>Bool</big>** : returns the truthy value of anything.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#Bool)]
[[play](https://go.dev/play/p/ETzeDJRSvhm)]
- **<big>And</big>** : returns true if both a and b are truthy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#And)]
[[play](https://go.dev/play/p/W1SSUmt6pvr)]
- **<big>Or</big>** : returns false if neither a nor b is truthy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#Or)]
[[play](https://go.dev/play/p/UlQTxHaeEkq)]
- **<big>Xor</big>** : returns true if a or b but not both is truthy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#Xor)]
[[play](https://go.dev/play/p/gObZrW7ZbG8)]
- **<big>Nor</big>** : returns true if neither a nor b is truthy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#Nor)]
[[play](https://go.dev/play/p/g2j08F_zZky)]
- **<big>Xnor</big>** : returns true if both a and b or neither a nor b are truthy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#Xnor)]
[[play](https://go.dev/play/p/OuDB9g51643)]
- **<big>Nand</big>** : returns false if both a and b are truthy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#Nand)]
[[play](https://go.dev/play/p/vSRMLxLIbq8)]
- **<big>TernaryOperator</big>** : ternary operator.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/condition.md#TernaryOperator)]
[[play](https://go.dev/play/p/ElllPZY0guT)]
<h3 id="convertor"> 5. Convertor package contains some functions for data conversion. <a href="#index">index</a> </h3>
```go
import "github.com/duke-git/lancet/v2/convertor"
```
#### Function list:
- **<big>ColorHexToRGB</big>** : convert color hex to color rgb.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ColorHexToRGB)]
[[play](https://go.dev/play/p/o7_ft-JCJBV)]
- **<big>ColorRGBToHex</big>** : convert rgb color to hex color.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ColorRGBToHex)]
[[play](https://go.dev/play/p/nzKS2Ro87J1)]
- **<big>ToBool</big>** : convert string to bool.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToBool)]
[[play](https://go.dev/play/p/ARht2WnGdIN)]
- **<big>ToBytes</big>** : convert value to byte slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToBytes)]
[[play](https://go.dev/play/p/fAMXYFDvOvr)]
- **<big>ToChar</big>** : convert string to char slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToChar)]
[[play](https://go.dev/play/p/JJ1SvbFkVdM)]
- **<big>ToChannel</big>** : convert a collection of elements to a read-only channel.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToChannel)]
[[play](https://go.dev/play/p/hOx_oYZbAnL)]
- **<big>ToFloat</big>** : convert value to float64, if param is a invalid floatable, will return 0.0 and error.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToFloat)]
[[play](https://go.dev/play/p/4YTmPCibqHJ)]
- **<big>ToInt</big>** : convert value to int64 value, if input is not numerical, return 0 and error.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToInt)]
[[play](https://go.dev/play/p/9_h9vIt-QZ_b)]
- **<big>ToJson</big>** : convert value to a json string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToJson)]
[[play](https://go.dev/play/p/2rLIkMmXWvR)]
- **<big>ToMap</big>** : convert a slice of structs to a map based on iteratee function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToMap)]
[[play](https://go.dev/play/p/tVFy7E-t24l)]
- **<big>ToPointer</big>** : return a pointer of passed value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToPointer)]
[[play](https://go.dev/play/p/ASf_etHNlw1)]
- **<big>ToString</big>** : convert value to string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToString)]
[[play](https://go.dev/play/p/nF1zOOslpQq)]
- **<big>StructToMap</big>** : convert struct to map, only convert exported struct field.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#StructToMap)]
[[play](https://go.dev/play/p/KYGYJqNUBOI)]
- **<big>MapToSlice</big>** : convert map to slice based on iteratee function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#MapToSlice)]
[[play](https://go.dev/play/p/dmX4Ix5V6Wl)]
- **<big>EncodeByte</big>** : encode data to byte slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#EncodeByte)]
[[play](https://go.dev/play/p/DVmM1G5JfuP)]
- **<big>DecodeByte</big>** : decode byte slice data to target object.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#DecodeByte)]
[[play](https://go.dev/play/p/zI6xsmuQRbn)]
- **<big>DeepClone</big>** : creates a deep copy of passed item, can't clone unexported field of struct.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#DeepClone)]
[[play](https://go.dev/play/p/j4DP5dquxnk)]
- **<big>CopyProperties</big>** : copies each field from the source struct into the destination struct.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#CopyProperties)]
[[play](https://go.dev/play/p/oZujoB5Sgg5)]
- **<big>ToInterface</big>** : converts reflect value to its interface type.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToInterface)]
[[play](https://go.dev/play/p/syqw0-WG7Xd)]
- **<big>Utf8ToGbk</big>** : converts utf8 encoding data to GBK encoding data
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#Utf8ToGbk)]
[[play](https://go.dev/play/p/9FlIaFLArIL)]
- **<big>GbkToUtf8</big>** : converts GBK encoding data to utf8 encoding data.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#GbkToUtf8)]
[[play](https://go.dev/play/p/OphmHCN_9u8)]
- **<big>ToStdBase64</big>** : converts a value to a string encoded in standard Base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToStdBase64)]
[[play](https://go.dev/play/p/_fLJqJD3NMo)]
- **<big>ToUrlBase64</big>** : converts a value to a string encoded in url Base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToUrlBase64)]
[[play](https://go.dev/play/p/C_d0GlvEeUR)]
- **<big>ToRawStdBase64</big>** : converts a value to a string encoded in raw standard Base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToRawStdBase64)]
[[play](https://go.dev/play/p/wSAr3sfkDcv)]
- **<big>ToRawUrlBase64</big>** : converts a value to a string encoded in raw url Base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToRawUrlBase64)]
[[play](https://go.dev/play/p/HwdDPFcza1O)]
- **<big>ToBigInt</big>** : converts an integer of any supported type (int, int64, uint64, etc.) to *big.Int.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/convertor.md#ToBigInt)]
[[play](https://go.dev/play/p/X3itkCxwB_x)]
<h3 id="cryptor"> 6. Cryptor package is for data encryption and decryption. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/cryptor"
```
#### Function list:
- **<big>AesEcbEncrypt</big>** : encrypt byte slice data with key use AES ECB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesEcbEncrypt)]
[[play](https://go.dev/play/p/zI6xsmuQRbn)]
- **<big>AesEcbDecrypt</big>** : decrypt byte slice data with key use AES ECB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesEcbDecrypt)]
[[play](https://go.dev/play/p/zI6xsmuQRbn)]
- **<big>AesCbcEncrypt</big>** : encrypt byte slice data with key use AES CBC algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesCbcEncrypt)]
[[play](https://go.dev/play/p/IOq_g8_lKZD)]
- **<big>AesCbcDecrypt</big>** : decrypt byte slice data with key use AES CBC algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesCbcDecrypt)]
[[play](https://go.dev/play/p/IOq_g8_lKZD)]
- **<big>AesCtrCrypt</big>** : encrypt/ decrypt byte slice data with key use AES CRC algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesCtrCrypt)]
[[play](https://go.dev/play/p/SpaZO0-5Nsp)]
- **<big>AesCfbEncrypt</big>** : encrypt byte slice data with key use AES CFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesCfbEncrypt)]
[[play](https://go.dev/play/p/tfkF10B13kH)]
- **<big>AesCfbDecrypt</big>** : decrypt byte slice data with key use AES CFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesCfbDecrypt)]
[[play](https://go.dev/play/p/tfkF10B13kH)]
- **<big>AesOfbEncrypt</big>** : encrypt byte slice data with key use AES OFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesOfbEncrypt)]
[[play](https://go.dev/play/p/VtHxtkUj-3F)]
- **<big>AesOfbDecrypt</big>** : decrypt byte slice data with key use AES OFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesOfbDecrypt)]
[[play](https://go.dev/play/p/VtHxtkUj-3F)]
- **<big>AesGcmEncrypt</big>** : encrypt byte slice data with key use AES GCM algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesGcmEncrypt)]
[[play](https://go.dev/play/p/rUt0-DmsPCs)]
- **<big>AesGcmDecrypt</big>** : decrypt byte slice data with key use AES GCM algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#AesGcmDecrypt)]
[[play](https://go.dev/play/p/rUt0-DmsPCs)]
- **<big>Base64StdEncode</big>** : encode string with base64 encoding.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Base64StdEncode)]
[[play](https://go.dev/play/p/VOaUyQUreoK)]
- **<big>Base64StdDecode</big>** : decode string with base64 encoding.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Base64StdDecode)]
[[play](https://go.dev/play/p/RWQylnJVgIe)]
- **<big>DesEcbEncrypt</big>** : encrypt byte slice data with key use DES ECB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesEcbEncrypt)]
[[play](https://go.dev/play/p/8qivmPeZy4P)]
- **<big>DesEcbDecrypt</big>** : decrypt byte slice data with key use DES ECB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesEcbDecrypt)]
[[play](https://go.dev/play/p/8qivmPeZy4P)]
- **<big>DesCbcEncrypt</big>** : encrypt byte slice data with key use DES CBC algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesCbcEncrypt)]
[[play](https://go.dev/play/p/4cC4QvWfe3_1)]
- **<big>DesCbcDecrypt</big>** : decrypt byte slice data with key use DES CBC algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesCbcDecrypt)]
[[play](https://go.dev/play/p/4cC4QvWfe3_1)]
- **<big>DesCtrCrypt</big>** : encrypt/decrypt byte slice data with key use DES CRY algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesCtrCrypt)]
[[play](https://go.dev/play/p/9-T6OjKpcdw)]
- **<big>DesCfbEncrypt</big>** : encrypt byte slice data with key use DES CFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesCfbEncrypt)]
[[play](https://go.dev/play/p/y-eNxcFBlxL)]
- **<big>DesCfbDecrypt</big>** : decrypt byte slice data with key use DES CFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesCfbDecrypt)]
[[play](https://go.dev/play/p/y-eNxcFBlxL)]
- **<big>DesOfbEncrypt</big>** : encrypt byte slice data with key use DES OFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesOfbEncrypt)]
[[play](https://go.dev/play/p/74KmNadjN1J)]
- **<big>DesOfbDecrypt</big>** : decrypt byte slice data with key use DES OFB algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#DesOfbDecrypt)]
[[play](https://go.dev/play/p/74KmNadjN1J)]
- **<big>HmacMd5</big>** : return the md5 hmac hash of string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacMd5)]
[[play](https://go.dev/play/p/uef0q1fz53I)]
- **<big>HmacMd5WithBase64</big>** : return the md5 hmac hash of base64 string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacMd5WithBase64)]
- **<big>HmacSha1</big>** : return the hmac hash of string use sha1.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacSha1)]
[[play](https://go.dev/play/p/1UI4oQ4WXKM)]
- **<big>HmacSha1WithBase64</big>** : return the hmac hash of string use sha1 with base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacSha1WithBase64)]
[[play](https://go.dev/play/p/47JmmGrnF7B)]
- **<big>HmacSha256</big>** : return the hmac hash of string use sha256.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacSha256)]
[[play](https://go.dev/play/p/HhpwXxFhhC0)]
- **<big>HmacSha256WithBase64</big>** : return the hmac hash of string use sha256 with base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacSha256WithBase64)]
[[play](https://go.dev/play/p/EKbkUvPTLwO)]
- **<big>HmacSha512</big>** : return the hmac hash of string use sha512.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacSha512)]
[[play](https://go.dev/play/p/59Od6m4A0Ud)]
- **<big>HmacSha512WithBase64</big>** : return the hmac hash of string use sha512 with base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacSha512WithBase64)]
[[play](https://go.dev/play/p/c6dSe3E2ydU)]
- **<big>Md5Byte</big>** : return the md5 string of byte slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Md5Byte)]
[[play](https://go.dev/play/p/suraalH8lyC)]
- **<big>Md5ByteWithBase64</big>** : return the md5 string of byte slice with base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Md5ByteWithBase64)]
[[play](https://go.dev/play/p/Tcb-Z7LN2ax)]
- **<big>Md5String</big>** : return the md5 value of string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Md5String)]
[[play](https://go.dev/play/p/1bLcVetbTOI)]
- **<big>Md5StringWithBase64</big>** : return the md5 value of string with base64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Md5StringWithBase64)]
[[play](https://go.dev/play/p/Lx4gH7Vdr5_y)]
- **<big>Md5File</big>** : return the md5 value of file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Md5File)]
- **<big>Sha1</big>** : return the sha1 value (SHA-1 hash algorithm) of base64 string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Sha1)]
[[play](https://go.dev/play/p/_m_uoD1deMT)]
- **<big>Sha1WithBase64</big>** : return the sha1 value (SHA-1 hash algorithm) of string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Sha1WithBase64)]
[[play](https://go.dev/play/p/fSyx-Gl2l2-)]
- **<big>Sha256</big>** : return the sha256 value (SHA-256 hash algorithm) of string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Sha256)]
[[play](https://go.dev/play/p/tU9tfBMIAr1)]
- **<big>Sha256WithBase64</big>** : return the sha256 value (SHA256 hash algorithm) of base64 string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Sha256WithBase64)]
[[play](https://go.dev/play/p/85IXJHIal1k)]
- **<big>Sha512</big>** : return the sha512 value (SHA-512 hash algorithm) of string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Sha512)]
[[play](https://go.dev/play/p/3WsvLYZxsHa)]
- **<big>Sha512WithBase64</big>** : return the sha512 value (SHA-512 hash algorithm) of base64 string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Sha512WithBase64)]
[[play](https://go.dev/play/p/q_fY2rA-k5I)]
- **<big>GenerateRsaKey</big>** : create rsa private and public pemo file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#GenerateRsaKey)]
[[play](https://go.dev/play/p/zutRHrDqs0X)]
- **<big>RsaEncrypt</big>** : encrypt data with ras algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#RsaEncrypt)]
[[play](https://go.dev/play/p/7_zo6mrx-eX)]
- **<big>RsaDecrypt</big>** : decrypt data with ras algorithm.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#RsaDecrypt)]
[[play](https://go.dev/play/p/7_zo6mrx-eX)]
- **<big>GenerateRsaKeyPair</big>** : creates rsa private and public key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#GenerateRsaKeyPair)]
[[play](https://go.dev/play/p/sSVmkfENKMz)]
- **<big>RsaEncryptOAEP</big>** : encrypts the given data with RSA-OAEP.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#RsaEncryptOAEP)]
[[play](https://go.dev/play/p/sSVmkfENKMz)]
- **<big>RsaDecryptOAEP</big>** : decrypts the data with RSA-OAEP
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#RsaDecryptOAEP)]
[[play](https://go.dev/play/p/sSVmkfENKMz)]
- **<big>RsaSign</big>** : signs the data with RSA.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#RsaSign)]
[[play](https://go.dev/play/p/qhsbf8BJ6Mf)]
- **<big>RsaVerifySign</big>** : verifies the signature of the data with RSA.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#RsaVerifySign)]
[[play](https://go.dev/play/p/qhsbf8BJ6Mf)]
<h3 id="datetime"> 7. Datetime package supports date and time format and compare. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/datetime"
```
#### Function list:
- **<big>AddDay</big>** : add or sub day to the time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddDay)]
[[play](https://go.dev/play/p/dIGbs_uTdFa)]
- **<big>AddHour</big>** : add or sub day to the time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddHour)]
[[play](https://go.dev/play/p/rcMjd7OCsi5)]
- **<big>AddMinute</big>** : add or sub day to the time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddMinute)]
[[play](https://go.dev/play/p/nT1heB1KUUK)]
- **<big>AddYear</big>** : add or sub year to the time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddYear)]
[[play](https://go.dev/play/p/MqW2ujnBx10)]
- **<big>BeginOfMinute</big>** : return the date time at the begin of minute of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#BeginOfMinute)]
[[play](https://go.dev/play/p/ieOLVJ9CiFT)]
- **<big>BeginOfHour</big>** : return the date time at the begin of hour of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#BeginOfHour)]
[[play](https://go.dev/play/p/GhdGFnDWpYs)]
- **<big>BeginOfDay</big>** : return the date time at the begin of day of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#BeginOfDay)]
[[play](https://go.dev/play/p/94m_UT6cWs9)]
- **<big>BeginOfWeek</big>** : return the date time at the begin of week of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#BeginOfWeek)]
[[play](https://go.dev/play/p/ynjoJPz7VNV)]
- **<big>BeginOfMonth</big>** : return the date time at the begin of month of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#BeginOfMonth)]
[[play](https://go.dev/play/p/bWXVFsmmzwL)]
- **<big>BeginOfYear</big>** : return the date time at the begin of year of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#BeginOfYear)]
[[play](https://go.dev/play/p/i326DSwLnV8)]
- **<big>EndOfMinute</big>** : return the date time at the end of minute of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#EndOfMinute)]
[[play](https://go.dev/play/p/yrL5wGzPj4z)]
- **<big>EndOfHour</big>** : return the date time at the end of hour of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#EndOfHour)]
[[play](https://go.dev/play/p/6ce3j_6cVqN)]
- **<big>EndOfDay</big>** : return the date time at the end of day of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#EndOfDay)]
[[play](https://go.dev/play/p/eMBOvmq5Ih1)]
- **<big>EndOfWeek</big>** : return the date time at the end of week of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#EndOfWeek)]
[[play](https://go.dev/play/p/i08qKXD9flf)]
- **<big>EndOfMonth</big>** : return the date time at the end of month of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#EndOfMonth)]
[[play](https://go.dev/play/p/_GWh10B3Nqi)]
- **<big>EndOfYear</big>** : return the date time at the end of year of specific date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#EndOfYear)]
[[play](https://go.dev/play/p/G01cKlMCvNm)]
- **<big>GetNowDate</big>** : return format yyyy-mm-dd of current date.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GetNowDate)]
[[play](https://go.dev/play/p/PvfkPpcpBBf)]
- **<big>GetNowTime</big>** : return format hh-mm-ss of current time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GetNowTime)]
[[play](https://go.dev/play/p/l7BNxCkTmJS)]
- **<big>GetNowDateTime</big>** : return format yyyy-mm-dd hh-mm-ss of current datetime.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GetNowDateTime)]
[[play](https://go.dev/play/p/pI4AqngD0al)]
- **<big>GetTodayStartTime</big>** : return the start time of today, format: yyyy-mm-dd 00:00:00.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GetTodayStartTime)]
[[play](https://go.dev/play/p/84siyYF7t99)]
- **<big>GetTodayEndTime</big>** : return the end time of today, format: yyyy-mm-dd 23:59:59.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GetTodayEndTime)]
[[play](https://go.dev/play/p/jjrLnfoqgn3)]
- **<big>GetZeroHourTimestamp</big>** : return timestamp of zero hour (timestamp of 00:00).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GetZeroHourTimestamp)]
[[play](https://go.dev/play/p/QmL2oIaGE3q)]
- **<big>GetNightTimestamp</big>** : return timestamp of zero hour (timestamp of 23:59).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GetNightTimestamp)]
[[play](https://go.dev/play/p/UolysR3MYP1)]
- **<big>FormatTimeToStr</big>** : convert time to string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#FormatTimeToStr)]
[[play](https://go.dev/play/p/_Ia7M8H_OvE)]
- **<big>FormatStrToTime</big>** : convert string to time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#FormatStrToTime)]
[[play](https://go.dev/play/p/1h9FwdU8ql4)]
- **<big>NewUnix</big>** : return unix timestamp of specific time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#NewUnix)]
[[play](https://go.dev/play/p/psoSuh_kLRt)]
- **<big>NewUnixNow</big>** : return unix timestamp of current time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#NewUnixNow)]
[[play](https://go.dev/play/p/U4PPx-9D0oz)]
- **<big>NewFormat</big>** : return unix timestamp of specific time string, t should be "yyyy-mm-dd hh:mm:ss".
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#NewFormat)]
[[play](https://go.dev/play/p/VkW08ZOaXPZ)]
- **<big>NewISO8601</big>** : return unix timestamp of specific iso8601 time string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#NewISO8601)]
[[play](https://go.dev/play/p/mkhOHQkdeA2)]
- **<big>ToUnix</big>** : return unix timestamp.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#ToUnix)]
[[play](https://go.dev/play/p/_LUiwAdocjy)]
- **<big>ToFormat</big>** : return the time string 'yyyy-mm-dd hh:mm:ss' of unix time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#ToFormat)]
[[play](https://go.dev/play/p/VkW08ZOaXPZ)]
- **<big>ToFormatForTpl</big>** : return the time string which format is specific tpl.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#ToFormatForTpl)]
[[play](https://go.dev/play/p/nyXxXcQJ8L5)]
- **<big>ToIso8601</big>** : return iso8601 time string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#ToIso8601)]
[[play](https://go.dev/play/p/mkhOHQkdeA2)]
- **<big>IsLeapYear</big>** : check if param `year` is leap year or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#IsLeapYear)]
[[play](https://go.dev/play/p/xS1eS2ejGew)]
- **<big>BetweenSeconds</big>** : returns the number of seconds between two times.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#BetweenSeconds)]
[[play](https://go.dev/play/p/n3YDRyfyXJu)]
- **<big>DayOfYear</big>** : returns which day of the year the parameter date `t` is.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#DayOfYear)]
[[play](https://go.dev/play/p/0hjqhTwFNlH)]
- **<big>IsWeekend</big>** : checks if passed time is weekend or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#IsWeekend)]
[[play](https://go.dev/play/p/cupRM5aZOIY)]
- **<big>NowDateOrTime</big>** : returns current datetime with specific format and timezone.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#NowDateOrTime)]
[[play](https://go.dev/play/p/EZ-begEjtT0)]
- **<big>Timestamp</big>** : returns current second timestamp.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#Timestamp)]
- **<big>TimestampMilli</big>** : returns current mill second timestamp.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#TimestampMilli)]
[[play](https://go.dev/play/p/4gvEusOTu1T)]
- **<big>TimestampMicro</big>** : returns current micro second timestamp.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#TimestampMicro)]
[[play](https://go.dev/play/p/2maANglKHQE)]
- **<big>TimestampNano</big>** : returns current nano second timestamp.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#TimestampNano)]
[[play](https://go.dev/play/p/A9Oq_COrcCF)]
- **<big>TrackFuncTime</big>** : tracks function execution time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#TrackFuncTime)]
[[play](https://go.dev/play/p/QBSEdfXHPTp)]
- **<big>DaysBetween</big>** : returns the number of days between two times.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#DaysBetween)]
[[play](https://go.dev/play/p/qD6qGb3TbOy)]
- **<big>GenerateDatetimesBetween</big>** : returns a slice of strings between two times.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#GenerateDatetimesBetween)]
[[play](https://go.dev/play/p/6kHBpAxD9ZC)]
- **<big>Min</big>** : returns the earliest time among the given times.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#Min)]
[[play](https://go.dev/play/p/MCIDvHNOGGb)]
- **<big>Max</big>** : returns the latest time among the given times.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#Max)]
[[play](https://go.dev/play/p/9m6JMk1LB7-)]
- **<big>MaxMin</big>** : returns the latest and earliest time among the given times.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#MaxMin)]
[[play](https://go.dev/play/p/rbW51cDtM_2)]
<h3 id="datastructure"> 8. Datastructure package contains some common data structure. eg. list, linklist, stack, queue, set, tree, graph. <a href="#index">index</a></h3>
```go
import list "github.com/duke-git/lancet/v2/datastructure/list"
import copyonwritelist "github.com/duke-git/lancet/v2/datastructure/copyonwritelist"
import link "github.com/duke-git/lancet/v2/datastructure/link"
import stack "github.com/duke-git/lancet/v2/datastructure/stack"
import queue "github.com/duke-git/lancet/v2/datastructure/queue"
import set "github.com/duke-git/lancet/v2/datastructure/set"
import tree "github.com/duke-git/lancet/v2/datastructure/tree"
import heap "github.com/duke-git/lancet/v2/datastructure/heap"
import hashmap "github.com/duke-git/lancet/v2/datastructure/hashmap"
import optional "github.com/duke-git/lancet/v2/datastructure/optional"
```
#### Structure list:
- **<big>List</big>** : a linear table, implemented with slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/list.md)]
- **<big>CopyOnWriteList</big>** : a thread-safe list implementation that uses go slicing as its base.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/copyonwritelist.md)]
- **<big>Link</big>** : link list structure, contains singly link and doubly link.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/link.md)]
- **<big>Stack</big>** : stack structure(fifo), contains array stack and link stack.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/stack.md)]
- **<big>Queue</big>** : queue structure(filo), contains array queue, circular queue, link queue and priority queue.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/queue.md)]
- **<big>Set</big>** : a data container, like slice, but element of set is not duplicate.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/set.md)]
- **<big>Tree</big>** : binary search tree structure.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/tree.md)]
- **<big>Heap</big>** : a binary max heap.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/heap.md)]
- **<big>Hashmap</big>** : hash map structure.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/hashmap.md)]
- **<big>Optional</big>** : Optional container.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/optional.md)]
<h3 id="fileutil"> 9. Fileutil package implements some basic functions for file operations. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/fileutil"
```
#### Function list:
- **<big>ClearFile</big>** : write empty string to target file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ClearFile)]
[[play](https://go.dev/play/p/NRZ0ZT-G94H)]
- **<big>CreateFile</big>** : create file in path.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#CreateFile)]
[[play](https://go.dev/play/p/lDt8PEsTNKI)]
- **<big>CreateDir</big>** : create directory in absolute path.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#CreateDir)]
[[play](https://go.dev/play/p/qUuCe1OGQnM)]
- **<big>CopyFile</big>** : copy src file to dest file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#CopyFile)]
[[play](https://go.dev/play/p/Jg9AMJMLrJi)]
- **<big>CopyDir</big>** : copy src directory to dest directory.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#CopyDir)]
[[play](https://go.dev/play/p/YAyFTA_UuPb)]
- **<big>FileMode</big>** : return file's mode and permission.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#FileMode)]
[[play](https://go.dev/play/p/2l2hI42fA3p)]
- **<big>MiMeType</big>** : return file mime type.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#MiMeType)]
[[play](https://go.dev/play/p/bd5sevSUZNu)]
- **<big>IsExist</big>** : checks if a file or directory exists.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#IsExist)]
[[play](https://go.dev/play/p/nKKXt8ZQbmh)]
- **<big>IsLink</big>** : checks if a file is symbol link or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#IsLink)]
[[play](https://go.dev/play/p/TL-b-Kzvf44)]
- **<big>IsDir</big>** : checks if the path is directory or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#IsDir)]
[[play](https://go.dev/play/p/WkVwEKqtOWk)]
- **<big>ListFileNames</big>** : return all file names in the path.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ListFileNames)]
[[play](https://go.dev/play/p/Tjd7Y07rejl)]
- **<big>RemoveFile</big>** : remove file, param should be file path.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#RemoveFile)]
[[play](https://go.dev/play/p/P2y0XW8a1SH)]
- **<big>ReadFileToString</big>** : return string of file content.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ReadFileToString)]
[[play](https://go.dev/play/p/cmfwp_5SQTp)]
- **<big>ReadFileByLine</big>** : read file line by line, return string slice of file content.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ReadFileByLine)]
[[play](https://go.dev/play/p/svJP_7ZrBrD)]
- **<big>Zip</big>** : create a zip file of fpath, fpath could be a file or a directory.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#Zip)]
[[play](https://go.dev/play/p/j-3sWBp8ik_P)]
- **<big>ZipAppendEntry</big>** : append a single file or directory by fpath to an existing zip file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ZipAppendEntry)]
- **<big>UnZip</big>** : unzip the zip file and save it to dest path.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#UnZip)]
[[play](https://go.dev/play/p/g0w34kS7B8m)]
- **<big>CurrentPath</big>** : return current absolute path.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#CurrentPath)]
[[play](https://go.dev/play/p/s74a9iBGcSw)]
- **<big>IsZipFile</big>** : checks if file is zip file or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#IsZipFile)]
[[play](https://go.dev/play/p/9M0g2j_uF_e)]
- **<big>FileSize</big>** : return file size in bytes.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#FileSize)]
[[play](https://go.dev/play/p/H9Z05uD-Jjc)]
- **<big>MTime</big>** : return file modified time(unix timestamp).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#MTime)]
[[play](https://go.dev/play/p/s_Tl7lZoAaY)]
- **<big>Sha</big>** : return file sha value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#Sha)]
[[play](https://go.dev/play/p/VfEEcO2MJYf)]
- **<big>ReadCsvFile</big>** : read file content into slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ReadCsvFile)]
[[play](https://go.dev/play/p/OExTkhGEd3_u)]
- **<big>WriteCsvFile</big>** : write content to target csv file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#WriteCsvFile)]
- **<big>WriteMapsToCsv</big>** : write slice of map to csv file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#WriteMapsToCsv)]
[[play](https://go.dev/play/p/umAIomZFV1c)]
- **<big>WriteBytesToFile</big>** : write bytes to target file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#WriteBytesToFile)]
[[play](https://go.dev/play/p/s7QlDxMj3P8)]
- **<big>WriteStringToFile</big>** : write string to target file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#WriteStringToFile)]
[[play](https://go.dev/play/p/GhLS6d8lH_g)]
- **<big>ReadFile</big>** : read file or url.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ReadFile)]
- **<big>ChunkRead</big>** : reads a block from the file at the specified offset and returns all lines within the block.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ChunkRead)]
[[play](https://go.dev/play/p/r0hPmKWhsgf)]
- **<big>ParallelChunkRead</big>** : reads the file in parallel and send each chunk of lines to the specified channel.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ParallelChunkRead)]
[[play](https://go.dev/play/p/teMXnCsdSEw)]
- **<big>GetExeOrDllVersion</big>** : Get the version of exe or dll file on windows os.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#GetExeOrDllVersion)]
[[play](https://go.dev/play/p/iLRrDBhE38E)]
<h3 id="formatter"> 10. Formatter contains some functions for data formatting. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/formatter"
```
#### Function list:
- **<big>Comma</big>** : add comma to a number value by every 3 numbers from right, ahead by a prefix symbol char.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/formatter.md#Comma)]
[[play](https://go.dev/play/p/eRD5k2vzUVX)]
- **<big>Pretty</big>** : pretty print data to JSON string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/formatter.md#Pretty)]
[[play](https://go.dev/play/p/YsciGj3FH2x)]
- **<big>PrettyToWriter</big>** : pretty encode data to writer.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/formatter.md#PrettyToWriter)]
[[play](https://go.dev/play/p/LPLZ3lDi5ma)]
- **<big>DecimalBytes</big>** : returns a human readable byte size under decimal standard (base 1000).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/formatter.md#DecimalBytes)]
[[play](https://go.dev/play/p/FPXs1suwRcs)]
- **<big>BinaryBytes</big>** : returns a human-readable byte size under binary standard (base 1024).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/formatter.md#BinaryBytes)]
[[play](https://go.dev/play/p/G9oHHMCAZxP)]
- **<big>ParseDecimalBytes</big>** : return the human readable bytes size string into the amount it represents(base 1000).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/formatter.md#ParseDecimalBytes)]
[[play](https://go.dev/play/p/Am98ybWjvjj)]
- **<big>ParseBinaryBytes</big>** : return the human readable bytes size string into the amount it represents(base 1024).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/formatter.md#ParseBinaryBytes)]
[[play](https://go.dev/play/p/69v1tTT62x8)]
<h3 id="function"> 11. Function package can control the flow of function execution and support part of functional programming. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/function"
```
#### Function list:
- **<big>After</big>** : return a function that invokes passed function once the returned function is called more than n times.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#After)]
[[play](https://go.dev/play/p/eRD5k2vzUVX)]
- **<big>Before</big>** : return a function that invokes passed function once the returned function is called less than n times
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Before)]
[[play](https://go.dev/play/p/0HqUDIFZ3IL)]
- **<big>CurryFn</big>** : make a curry function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#CurryFn)]
[[play](https://go.dev/play/p/5HopfDwANKX)]
- **<big>Compose</big>** : compose the functions from right to left.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Compose)]
[[play](https://go.dev/play/p/KKfugD4PKYF)]
- **<big>Delay</big>** : call the function after delayed time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Delay)]
[[play](https://go.dev/play/p/Ivtc2ZE-Tye)]
- **<big>Debounced<sup>deprecated</sup></big>** : creates a debounced function that delays invoking fn until after wait duration have elapsed since the last time the debounced function was invoked.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Debounced)]
[[play](https://go.dev/play/p/absuEGB_GN7)]
- **<big>Debounce</big>** : creates a debounced version of the provided function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Debounce)]
[[play](https://go.dev/play/p/-dGFrYn_1Zi)]
- **<big>Throttle</big>** : creates a throttled version of the provided function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Throttle)]
[[play](https://go.dev/play/p/HpoMov-tJSN)]
- **<big>Schedule</big>** : invoke function every duration time, util close the returned bool channel.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Schedule)]
[[play](https://go.dev/play/p/hbON-Xeyn5N)]
- **<big>Pipeline</big>** : takes a list of functions and returns a function whose param will be passed into the functions one by one.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Pipeline)]
[[play](https://go.dev/play/p/mPdUVvj6HD6)]
- **<big>AcceptIf</big>** : returns another function of the same signature as the apply function but also includes a bool value to indicate success or failure.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#AcceptIf)]
[[play](https://go.dev/play/p/XlXHHtzCf7d)]
- **<big>And</big>** : returns a composed predicate that represents the logical AND of a list of predicates.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#And)]
[[play](https://go.dev/play/p/dTBHJMQ0zD2)]
- **<big>Or</big>** : returns a composed predicate that represents the logical OR of a list of predicates.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Or)]
[[play](https://go.dev/play/p/LitCIsDFNDA)]
- **<big>Negate</big>** : returns a predicate that represents the logical negation of this predicate.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Negate)]
[[play](https://go.dev/play/p/jbI8BtgFnVE)]
- **<big>Nor</big>** : returns a composed predicate that represents the logical NOR of a list of predicates.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Nor)]
[[play](https://go.dev/play/p/2KdCoBEOq84)]
- **<big>Nand</big>** : returns a composed predicate that represents the logical Nand of a list of predicates.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Nand)]
[[play](https://go.dev/play/p/Rb-FdNGpgSO)]
- **<big>Xnor</big>** : returns a composed predicate that represents the logical XNOR of a list of predicates.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Xnor)]
[[play](https://go.dev/play/p/FJxko8SFbqc)]
- **<big>Watcher</big>** : Watcher is used for record code execution time. can start/stop/reset the watch timer. get the elapsed time of function execution.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/function.md#Watcher)]
[[play](https://go.dev/play/p/l2yrOpCLd1I)]
<h3 id="maputil"> 12. Maputil package includes some functions to manipulate map. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/maputil"
```
#### Function list:
- **<big>MapTo</big>** : quick map any value to struct or any base type.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#MapTo)]
[[play](https://go.dev/play/p/4K7KBEPgS5M)]
- **<big>ForEach</big>** : executes iteratee function for every key and value pair in map.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ForEach)]
[[play](https://go.dev/play/p/OaThj6iNVXK)]
- **<big>Filter</big>** : iterates over map, return a new map contains all key and value pairs pass the predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Filter)]
[[play](https://go.dev/play/p/fSvF3wxuNG7)]
- **<big>FilterByKeys</big>** : iterates over map, return a new map whose keys are all given keys
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#FilterByKeys)]
[[play](https://go.dev/play/p/7ov6BJHbVqh)]
- **<big>FilterByValues</big>** : iterates over map, return a new map whose values are all given values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#FilterByValues)]
[[play](https://go.dev/play/p/P3-9MdcXegR)]
- **<big>OmitBy</big>** : the opposite of Filter, removes all the map elements for which the predicate function returns true.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OmitBy)]
[[play](https://go.dev/play/p/YJM4Hj5hNwm)]
- **<big>OmitByKeys</big>** : the opposite of FilterByKeys, extracts all the map elements which keys are not omitted.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OmitByKeys)]
[[play](https://go.dev/play/p/jXGrWDBfSRp)]
- **<big>OmitByValues</big>** : the opposite of FilterByValues. remove all elements whose value are in the give slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OmitByValues)]
[[play](https://go.dev/play/p/XB7Y10uw20_U)]
- **<big>Intersect</big>** : iterates over maps, return a new map of key and value pairs in all given maps.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Intersect)]
[[play](https://go.dev/play/p/Zld0oj3sjcC)]
- **<big>Keys</big>** : returns a slice of the map's keys.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Keys)]
[[play](https://go.dev/play/p/xNB5bTb97Wd)]
- **<big>KeysBy</big>** : creates a slice whose element is the result of function mapper invoked by every map's key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#KeysBy)]
[[play](https://go.dev/play/p/hI371iB8Up8)]
- **<big>Merge</big>** : merge maps, next key will overwrite previous key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Merge)]
[[play](https://go.dev/play/p/H95LENF1uB-)]
- **<big>Minus</big>** : creates a map of whose key in mapA but not in mapB.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Minus)]
[[play](https://go.dev/play/p/3u5U9K7YZ9m)]
- **<big>Values</big>** : returns a slice of the map's values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Values)]
[[play](https://go.dev/play/p/CBKdUc5FTW6)]
- **<big>ValuesBy</big>** : creates a slice whose element is the result of function mapper invoked by every map's value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ValuesBy)]
[[play](https://go.dev/play/p/sg9-oRidh8f)]
- **<big>MapKeys</big>** : transforms a map to other type map by manipulating it's keys.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#MapKeys)]
[[play](https://go.dev/play/p/8scDxWeBDKd)]
- **<big>MapValues</big>** : transforms a map to other type map by manipulating it's values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#MapValues)]
[[play](https://go.dev/play/p/g92aY3fc7Iw)]
- **<big>Entries</big>** : transforms a map into array of key/value pairs.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Entries)]
[[play](https://go.dev/play/p/Ltb11LNcElY)]
- **<big>FromEntries</big>** : creates a map based on a slice of key/value pairs.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#FromEntries)]
[[play](https://go.dev/play/p/fTdu4sCNjQO)]
- **<big>Transform</big>** : transform a map to another type map.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#Transform)]
[[play](https://go.dev/play/p/P6ovfToM3zj)]
- **<big>IsDisjoint</big>** : check two map are disjoint if they have no keys in common.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#IsDisjoint)]
[[play](https://go.dev/play/p/N9qgYg_Ho6f)]
- **<big>HasKey</big>** : checks if map has key or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#HasKey)]
[[play](https://go.dev/play/p/isZZHOsDhFc)]
- **<big>GetOrSet</big>** : returns value of the given key or set the given value value if not present.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#GetOrSet)]
[[play](https://go.dev/play/p/IVQwO1OkEJC)]
- **<big>MapToStruct</big>** : converts map to struct.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#MapToStruct)]
[[play](https://go.dev/play/p/7wYyVfX38Dp)]
- **<big>ToSortedSlicesDefault</big>** : converts a map to two slices sorted by key: one for the keys and another for the values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ToSortedSlicesDefault)]
[[play](https://go.dev/play/p/43gEM2po-qy)]
- **<big>ToSortedSlicesWithComparator</big>** : converts a map to two slices sorted by key and using a custom comparison function: one for the keys and another for the values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ToSortedSlicesWithComparator)]
[[play](https://go.dev/play/p/0nlPo6YLdt3)]
- **<big>NewOrderedMap</big>** : creates a new OrderedMap.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#NewOrderedMap)]
[[play](https://go.dev/play/p/Y4ZJ_oOc1FU)]
- **<big>OrderedMap_Set</big>** : sets the given key-value pair for ordered map.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Set)]
[[play](https://go.dev/play/p/Y4ZJ_oOc1FU)]
- **<big>OrderedMap_Get</big>** : returns the value for the given key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Get)]
[[play](https://go.dev/play/p/Y4ZJ_oOc1FU)]
- **<big>OrderedMap_Delete</big>** : deletes the key-value pair for the given key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Delete)]
[[play](ttps://go.dev/play/p/5bIi4yaZ3K-)]
- **<big>OrderedMap_Clear</big>** : clears the ordered map.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Clear)]
[[play](https://go.dev/play/p/8LwoJyEfuFr)]
- **<big>OrderedMap_Front</big>** : returns the first key-value pair.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Front)]
[[play](https://go.dev/play/p/ty57XSimpoe)]
- **<big>OrderedMap_Back</big>** : returns the last key-value pair.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Back)]
[[play](https://go.dev/play/p/rQMjp1yQmpa)]
- **<big>OrderedMap_Range</big>** : calls the given function for each key-value pair.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Range)]
[[play](https://go.dev/play/p/U-KpORhc7LZ)]
- **<big>OrderedMap_Keys</big>** : returns the keys in order.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Keys)]
[[play](https://go.dev/play/p/Vv_y9ExKclA)]
- **<big>OrderedMap_Values</big>** : returns the values in order.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Values)]
[[play](https://go.dev/play/p/TWj5n1-PUfx)]
- **<big>OrderedMap_Elements</big>** : returns the key-value pairs in order.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Elements)]
[[play](https://go.dev/play/p/4BHG4kKz6bB)]
- **<big>OrderedMap_Len</big>** : returns the number of key-value pairs.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Len)]
[[play](https://go.dev/play/p/cLe6z2VX5N-)]
- **<big>OrderedMap_Contains</big>** : returns true if the given key exists.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Contains)]
[[play](https://go.dev/play/p/QuwqqnzwDNX)]
- **<big>OrderedMap_Iter</big>** : returns a channel that yields key-value pairs in order.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_Iter)]
[[play](https://go.dev/play/p/tlq2tdvicPt)]
- **<big>OrderedMap_ReverseIter</big>** : returns a channel that yields key-value pairs in reverse order.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_ReverseIter)]
[[play](https://go.dev/play/p/8Q0ssg6hZzO)]
- **<big>OrderedMap_SortByKey</big>** : sorts the map by key given less function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_SortByKey)]
[[play](https://go.dev/play/p/N7hjD_alZPq)]
- **<big>OrderedMap_MarshalJSON</big>** : implements the json.Marshaler interface.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_MarshalJSON)]
[[play](https://go.dev/play/p/C-wAwydIAC7)]
- **<big>OrderedMap_UnmarshalJSON</big>** : implements the json.Unmarshaler interface.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#OrderedMap_UnmarshalJSON)]
[[play](https://go.dev/play/p/t_pkwerIRVx)]
- **<big>NewConcurrentMap</big>** : creates a ConcurrentMap with specific shard count.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#NewConcurrentMap)]
[[play](https://go.dev/play/p/3PenTPETJT0)]
- **<big>ConcurrentMap_Set</big>** : set the value for a key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ConcurrentMap_Set)]
[[play](https://go.dev/play/p/3PenTPETJT0)]
- **<big>ConcurrentMap_Get</big>** : get the value stored in the map for a key, or nil if no.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ConcurrentMap_Get)]
[[play](https://go.dev/play/p/3PenTPETJT0)]
- **<big>ConcurrentMap_GetOrSet</big>** : returns the existing value for the key if present.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ConcurrentMap_GetOrSet)]
[[play](https://go.dev/play/p/aDcDApOK01a)]
- **<big>ConcurrentMap_Delete</big>** : delete the value for a key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ConcurrentMap_Delete)]
[[play](https://go.dev/play/p/uTIJZYhpVMS)]
- **<big>ConcurrentMap_GetAndDelete</big>** :returns the existing value for the key if present and then delete the value for the key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ConcurrentMap_GetAndDelete)]
[[play](https://go.dev/play/p/ZyxeIXSZUiM)]
- **<big>ConcurrentMap_Has</big>** : checks if map has the value for a key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ConcurrentMap_Has)]
[[play](https://go.dev/play/p/C8L4ul9TVwf)]
- **<big>ConcurrentMap_Range</big>** : calls iterator sequentially for each key and value present in each of the shards in the map.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#ConcurrentMap_Range)]
[[play](https://go.dev/play/p/iqcy7P8P0Pr)]
- **<big>SortByKey</big>** : sorts the map by its keys and returns a new map with sorted keys.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#SortByKey)]
[[play](https://go.dev/play/p/PVdmBSnm6P_W)]
- **<big>GetOrDefault</big>** : returns the value of the given key or a default value if the key is not present.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/maputil.md#GetOrDefault)]
[[play](https://go.dev/play/p/99QjSYSBdiM)]
<h3 id="mathutil"> 13. Mathutil package implements some functions for math calculation. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/mathutil"
```
#### Function list:
- **<big>Average</big>** :return average value of numbers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Average)]
[[play](https://go.dev/play/p/Vv7LBwER-pz)]
- **<big>Exponent</big>** : calculate x^n for int64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Exponent)]
[[play](https://go.dev/play/p/uF3HGNPk8wr)]
- **<big>Fibonacci</big>** :calculate fibonacci number before n for int.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Fibonacci)]
[[play](https://go.dev/play/p/IscseUNMuUc)]
- **<big>Factorial</big>** : calculate x! for uint.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Factorial)]
[[play](https://go.dev/play/p/tt6LdOK67Nx)]
- **<big>Max</big>** : return maximum value of numbers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Max)]
[[play](https://go.dev/play/p/cN8DHI0rTkH)]
- **<big>MaxBy</big>** : return the maximum value of a slice using the given comparator function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#MaxBy)]
[[play](https://go.dev/play/p/pbe2MT-7DV2)]
- **<big>Min</big>** : return minimum value of numbers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Min)]
[[play](https://go.dev/play/p/21BER_mlGUj)]
- **<big>MinBy</big>** : return the minimum value of a slice using the given comparator function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#MinBy)]
[[play](https://go.dev/play/p/N9qgYg_Ho6f)]
- **<big>Percent</big>** : calculate the percentage of value to total.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Percent)]
[[play](https://go.dev/play/p/s0NdFCtwuyd)]
- **<big>RoundToFloat</big>** : round up to n decimal places for float64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#RoundToFloat)]
[[play](https://go.dev/play/p/ghyb528JRJL)]
- **<big>RoundToString</big>** : round up to n decimal places for float64, return string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#RoundToString)]
[[play](https://go.dev/play/p/kZwpBRAcllO)]
- **<big>TruncRound</big>** : round off n decimal places for int64.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#TruncRound)]
[[play](https://go.dev/play/p/aumarSHIGzP)]
- **<big>CeilToFloat</big>** : round float up n decimal places.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#CeilToFloat)]
[[play](https://go.dev/play/p/8hOeSADZPCo)]
- **<big>CeilToString</big>** : round float up n decimal places, then conver to string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#CeilToString)]
[[play](https://go.dev/play/p/wy5bYEyUKKG)]
- **<big>FloorToFloat</big>** : round float down n decimal places.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#FloorToFloat)]
[[play](https://go.dev/play/p/vbCBrQHZEED)]
- **<big>FloorToString</big>** : round float down n decimal places, then conver to string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#FloorToString)]
[[play](https://go.dev/play/p/Qk9KPd2IdDb)]
- **<big>Range</big>** : Creates a slice of numbers from start with specified count, element step is 1.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Range)]
[[play](https://go.dev/play/p/9ke2opxa8ZP)]
- **<big>RangeWithStep</big>** : Creates a slice of numbers from start to end with specified step.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Range)]
[[play](https://go.dev/play/p/akLWz0EqOSM)]
- **<big>AngleToRadian</big>** : converts angle value to radian value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#AngleToRadian)]
[[play](https://go.dev/play/p/CIvlICqrHql)]
- **<big>RadianToAngle</big>** : converts radian value to angle value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#RadianToAngle)]
[[play](https://go.dev/play/p/dQtmOTUOMgi)]
- **<big>PointDistance</big>** : get two points distance.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#PointDistance)]
[[play](https://go.dev/play/p/RrG4JIaziM8)]
- **<big>IsPrime</big>** : checks if number is prime number.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#IsPrime)]
[[play](https://go.dev/play/p/Rdd8UTHZJ7u)]
- **<big>GCD</big>** : return greatest common divisor (GCD) of integers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#GCD)]
[[play](https://go.dev/play/p/CiEceLSoAKB)]
- **<big>LCM</big>** : return Least Common Multiple (LCM) of integers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#LCM)]
[[play](https://go.dev/play/p/EjcZxfY7G_g)]
- **<big>Cos</big>** : return the cosine of the radian argument.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Cos)]
[[play](https://go.dev/play/p/Sm89LoIfvFq)]
- **<big>Sin</big>** : return the sine of the radian argument.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Sin)]
[[play](https://go.dev/play/p/TWMQlMywDsP)]
- **<big>Log</big>** : returns the logarithm of base n.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Log)]
[[play](https://go.dev/play/p/_d4bi8oyhat)]
- **<big>Sum</big>** : return sum of passed numbers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Sum)]
[[play](https://go.dev/play/p/1To2ImAMJA7)]
- **<big>Abs</big>** : returns the absolute value of param number.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Sum)]
[[play](https://go.dev/play/p/fsyBh1Os-1d)]
- **<big>Div</big>** : returns the result of x divided by y.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Div)]
[[play](https://go.dev/play/p/WLxDdGXXYat)]
- **<big>Variance</big>** : returns the variance of numbers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Variance)]
[[play](https://go.dev/play/p/uHuV4YgXf8F)]
- **<big>StdDev</big>** : returns the standard deviation of numbers.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#StdDev)]
[[play](https://go.dev/play/p/FkNZDXvHD2l)]
- **<big>Permutation</big>** : calculates P(n, k).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Permutation)]
[[play](https://go.dev/play/p/MgobwH_FOxj)]
- **<big>Combination</big>** : calculates C(n, k).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/mathutil.md#Combination)]
[[play](https://go.dev/play/p/ENFQRDQUFi9)]
<h3 id="netutil"> 14. Netutil package contains functions to get net information and send http request. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/netutil"
```
#### Function list:
- **<big>ConvertMapToQueryString</big>** : convert map to sorted url query string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#ConvertMapToQueryString)]
[[play](https://go.dev/play/p/jnNt_qoSnRi)]
- **<big>EncodeUrl</big>** : encode url(?a=1&b=[2] -> ?a=1&b=%5B2%5D).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#EncodeUrl)]
[[play](https://go.dev/play/p/bsZ6BRC4uKI)]
- **<big>GetInternalIp</big>** : return internal ipv4.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#GetInternalIp)]
[[play](https://go.dev/play/p/5mbu-gFp7ei)]
- **<big>GetIps</big>** : return all ipv4 of current system.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#GetIps)]
[[play](https://go.dev/play/p/NUFfcEmukx1)]
- **<big>GetMacAddrs</big>** : return mac address of current system.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#GetMacAddrs)]
[[play](https://go.dev/play/p/Rq9UUBS_Xp1)]
- **<big>GetPublicIpInfo</big>** : return [public ip information](http://ip-api.com/json/).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#GetPublicIpInfo)]
[[play](https://go.dev/play/p/YDxIfozsRHR)]
- **<big>GetRequestPublicIp</big>** : return the http request public ip.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#GetRequestPublicIp)]
[[play](https://go.dev/play/p/kxU-YDc_eBo)]
- **<big>IsPublicIP</big>** : verify a ip is public or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#IsPublicIP)]
[[play](https://go.dev/play/p/nmktSQpJZnn)]
- **<big>IsInternalIP</big>** : verify an ip is intranet or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#IsInternalIP)]
[[play](https://go.dev/play/p/sYGhXbgO4Cb)]
- **<big>HttpRequest</big>** : a composed http request used for HttpClient send request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpRequest)]
[[play](https://go.dev/play/p/jUSgynekH7G)]
- **<big>HttpClient</big>** : a http client tool, used for sending http request
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpClient)]
[[play](https://go.dev/play/p/jUSgynekH7G)]
- **<big>SendRequest</big>** : send http request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#SendRequest)]
[[play](https://go.dev/play/p/jUSgynekH7G)]
- **<big>DecodeResponse</big>** : decode http response into target object.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#DecodeResponse)]
[[play](https://go.dev/play/p/jUSgynekH7G)]
- **<big>StructToUrlValues</big>** : convert struct to url values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#StructToUrlValues)]
[[play](https://go.dev/play/p/pFqMkM40w9z)]
- **<big>HttpGet<sup>deprecated</sup></big>** : send http get request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpGet)]
- **<big>HttpDelete<sup>deprecated</sup></big>** : send http delete request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpDelete)]
- **<big>HttpPost<sup>deprecated</sup></big>** : send http post request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpPost)]
- **<big>HttpPut<sup>deprecated</sup></big>** : send http put request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpPut)]
- **<big>HttpPatch<sup>deprecated</sup></big>** : send http patch request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpPatch)]
- **<big>ParseHttpResponse</big>** : decode http response into target object.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#ParseHttpResponse)]
- **<big>DownloadFile</big>** : download the file exist in url to a local file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#DownloadFile)]
- **<big>UploadFile</big>** : upload the file to a server.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#UploadFile)]
- **<big>IsPingConnected</big>** : checks if can ping the specified host or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#IsPingConnected)]
[[play](https://go.dev/play/p/q8OzTijsA87)]
- **<big>IsTelnetConnected</big>** : checks if can if can telnet the specified host or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#IsTelnetConnected)]
[[play](https://go.dev/play/p/yiLCGtQv_ZG)]
<h3 id="pointer"> 15. Pointer package contains some util functions to operate go pointer. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/pointer"
```
#### Function list:
- **<big>ExtractPointer</big>** : return the underlying value by the given interface type.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/pointer.md#ExtractPointer)]
[[play](https://go.dev/play/p/D7HFjeWU2ZP)]
- **<big>Of</big>** : return a pointer to the value `v`.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/pointer.md#Of)]
[[play](https://go.dev/play/p/HFd70x4DrMj)]
- **<big>Unwrap</big>** : return the value from the pointer.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/pointer.md#Unwrap)]
[[play](https://go.dev/play/p/cgeu3g7cjWb)]
- **<big>UnwrapOr</big>** : UnwrapOr returns the value from the pointer or fallback if the pointer is nil.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/pointer.md#UnwrapOr)]
[[play](https://go.dev/play/p/mmNaLC38W8C)]
- **<big>UnwarpOrDefault</big>** : UnwarpOrDefault returns the value from the pointer or the default value if the pointer is nil.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/pointer.md#UnwrapOrDefault)]
[[play](https://go.dev/play/p/ZnGIHf8_o4E)]
<h3 id="random"> 16. Random package implements some basic functions to generate random int and string. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/random"
```
#### Function list:
- **<big>RandBytes</big>** : generate random byte slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandBytes)]
[[play](https://go.dev/play/p/EkiLESeXf8d)]
- **<big>RandInt</big>** : generate random int number between min and max.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandInt)]
[[play](https://go.dev/play/p/pXyyAAI5YxD)]
- **<big>RandString</big>** : generate random string of specific length.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandString)]
[[play](https://go.dev/play/p/W2xvRUXA7Mi)]
- **<big>RandUpper</big>** : generate a random upper case string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandUpper)]
[[play](https://go.dev/play/p/29QfOh0DVuh)]
- **<big>RandLower</big>** : generate a random lower case string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandLower)]
[[play](https://go.dev/play/p/XJtZ471cmtI)]
- **<big>RandNumeral</big>** : generate a random numeral string of specific length.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandNumeral)]
[[play](https://go.dev/play/p/g4JWVpHsJcf)]
- **<big>RandNumeralOrLetter</big>** : generate a random numeral or letter string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandNumeralOrLetter)]
[[play](https://go.dev/play/p/19CEQvpx2jD)]
- **<big>UUIdV4</big>** : generate a random UUID of version 4 according to RFC 4122.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#UUIdV4)]
[[play](https://go.dev/play/p/_Z9SFmr28ft)]
- **<big>RandUniqueIntSlice</big>** : generate a slice of random int that do not repeat.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandUniqueIntSlice)]
[[play](https://go.dev/play/p/uBkRSOz73Ec)]
- **<big>RandSymbolChar</big>** : generate a random symbol char of specified length.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandSymbolChar)]
[[play](https://go.dev/play/p/Im6ZJxAykOm)]
- **<big>RandFloat</big>** : generate a random float64 number between [min, max) with specific precision.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandFloat)]
[[play](https://go.dev/play/p/zbD_tuobJtr)]
- **<big>RandFloats</big>** : generate a slice of random float64 numbers that do not repeat.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandFloats)]
[[play](https://go.dev/play/p/I3yndUQ-rhh)]
- **<big>RandStringSlice</big>** : generate a slice of random string of length strLen based on charset.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandStringSlice)]
[[play](https://go.dev/play/p/2_-PiDv3tGn)]
- **<big>RandBool</big>** : generate a random boolean value (true or false).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandBool)]
[[play](https://go.dev/play/p/to6BLc26wBv)]
- **<big>RandBoolSlice</big>** : generate a random boolean slice of specified length.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandBoolSlice)]
[[play](https://go.dev/play/p/o-VSjPjnILI)]
- **<big>RandIntSlice</big>** : generate a slice of random int. Number range in [min, max)
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandIntSlice)]
[[play](https://go.dev/play/p/GATTQ5xTEG8)]
- **<big>RandFromGivenSlice</big>** : generate a random element from given slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandFromGivenSlice)]
[[play](https://go.dev/play/p/UrkWueF6yYo)]
- **<big>RandSliceFromGivenSlice</big>** : generate a random slice of length num from given slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandSliceFromGivenSlice)]
[[play](https://go.dev/play/p/68UikN9d6VT)]
- **<big>RandNumberOfLength</big>** : generates a random int number of specified length.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/random.md#RandNumberOfLength)]
[[play](https://go.dev/play/p/oyZbuV7bu7b)]
<h3 id="retry"> 17. Retry package is for executing a function repeatedly until it was successful or canceled by the context. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/retry"
```
#### Function list:
- **<big>Context</big>** : set retry context config option.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#Context)]
[[play](https://go.dev/play/p/xnAOOXv9GkS)]
- **<big>Retry</big>** : executes the retryFunc repeatedly until it was successful or canceled by the context.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#Retry)]
[[play](https://go.dev/play/p/nk2XRmagfVF)]
- **<big>RetryFunc</big>** : function that retry executes.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#RetryFunc)]
[[play](https://go.dev/play/p/nk2XRmagfVF)]
- **<big>RetryDuration</big>** : set duration of retry
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#RetryDuration)]
[[play](https://go.dev/play/p/nk2XRmagfVF)]
- **<big>RetryTimes</big>** : set times of retry.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#RetryTimes)]
[[play](https://go.dev/play/p/ssfVeU2SwLO)]
- **<big>BackoffStrategy</big>** : An interface that defines a method for calculating backoff intervals.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#BackoffStrategy)]
- **<big>RetryWithCustomBackoff</big>** : set abitary custom backoff strategy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#RetryWithCustomBackoff)]
[[play](https://go.dev/play/p/jIm_o2vb5Y4)]
- **<big>RetryWithLinearBackoff</big>** : set linear strategy backoff.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#RetryWithLinearBackoff)]
[[play](https://go.dev/play/p/PDet2ZQZwcB)]
- **<big>RetryWithExponentialWithJitterBackoff</big>** : set exponential strategy backoff.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/retry.md#RetryWithExponentialWithJitterBackoff)]
[[play](https://go.dev/play/p/xp1avQmn16X)]
<h3 id="slice"> 18. Slice contains some functions to manipulate slice. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/slice"
```
#### Function list:
- **<big>AppendIfAbsent</big>** : if the item is absent,append it to the slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#AppendIfAbsent)]
[[play](https://go.dev/play/p/GNdv7Jg2Taj)]
- **<big>Contain</big>** : check if the value is in the slice or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Contain)]
[[play](https://go.dev/play/p/_454yEHcNjf)]
- **<big>ContainBy</big>** : returns true if predicate function return true.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ContainBy)]
[[play](https://go.dev/play/p/49tkHfX4GNc)]
- **<big>ContainSubSlice</big>** : check if the slice contain a given subslice or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ContainSubSlice)]
[[play](https://go.dev/play/p/bcuQ3UT6Sev)]
- **<big>Chunk</big>** : creates a slice of elements split into groups the length of size.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Chunk)]
[[play](https://go.dev/play/p/b4Pou5j2L_C)]
- **<big>Compact</big>** : creates an slice with all falsy values removed. The values false, nil, 0, and "" are falsy.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Compact)]
[[play](https://go.dev/play/p/pO5AnxEr3TK)]
- **<big>Concat</big>** : creates a new slice concatenating slice with any additional slices.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Concat)]
[[play](https://go.dev/play/p/gPt-q7zr5mk)]
- **<big>Count</big>** : returns the number of occurrences of the given item in the slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Count)]
[[play](https://go.dev/play/p/Mj4oiEnQvRJ)]
- **<big>CountBy</big>** : iterates over elements of slice with predicate function, returns the number of all matched elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#CountBy)]
[[play](https://go.dev/play/p/tHOccTMDZCC)]
- **<big>Difference</big>** : creates an slice of whose element in slice but not in compared slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Difference)]
[[play](https://go.dev/play/p/VXvadzLzhDa)]
- **<big>DifferenceBy</big>** : accepts iteratee which is invoked for each element of slice and values to generate the criterion by which they're compared.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#DifferenceBy)]
[[play](https://go.dev/play/p/DiivgwM5OnC)]
- **<big>DifferenceWith</big>** : accepts comparator which is invoked to compare elements of slice to values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#DifferenceWith)]
[[play](https://go.dev/play/p/v2U2deugKuV)]
- **<big>DeleteAt</big>** : delete the element of slice at index.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#DeleteAt)]
[[play](https://go.dev/play/p/800B1dPBYyd)]
- **<big>DeleteRange</big>** : delete the element of slice from start index to end index(exclude).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#DeleteRange)]
[[play](https://go.dev/play/p/945HwiNrnle)]
- **<big>Drop</big>** : drop n elements from the start of a slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Drop)]
[[play](https://go.dev/play/p/jnPO2yQsT8H)]
- **<big>DropRight</big>** : drop n elements from the end of a slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#DropRight)]
[[play](https://go.dev/play/p/8bcXvywZezG)]
- **<big>DropWhile</big>** : drop n elements from the start of a slice while predicate function returns true.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#DropWhile)]
[[play](https://go.dev/play/p/4rt252UV_qs)]
- **<big>DropRightWhile</big>** : drop n elements from the end of a slice while predicate function returns true.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#DropRightWhile)]
[[play](https://go.dev/play/p/6wyK3zMY56e)]
- **<big>Equal</big>** : checks if two slices are equal: the same length and all elements' order and value are equal.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Equal)]
[[play](https://go.dev/play/p/WcRQJ37ifPa)]
- **<big>EqualWith</big>** : checks if two slices are equal with comparator func.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#EqualWith)]
[[play](https://go.dev/play/p/b9iygtgsHI1)]
- **<big>Every</big>** : return true if all of the values in the slice pass the predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Every)]
[[play](https://go.dev/play/p/R8U6Sl-j8cD)]
- **<big>Filter</big>** : iterates over elements of slice, returning an slice of all elements pass the predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Filter)]
[[play](https://go.dev/play/p/SdPna-7qK4T)]
- **<big>FilterMap</big>** : returns a slice which apply both filtering and mapping to the given slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#FilterMap)]
[[play](https://go.dev/play/p/J94SZ_9MiIe)]
- **<big>Find<sup>deprecated</sup></big>** : iterates over elements of slice, returning the first one that passes a truth test on predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Find)]
[[play](https://go.dev/play/p/CBKeBoHVLgq)]
- **<big>FindBy</big>** : iterates over elements of slice, returning the first one that passes a truth test on predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#FindBy)]
[[play](https://go.dev/play/p/n1lysBYl-GB)]
- **<big>FindLast<sup>deprecated</sup></big>** : return the last item that passes a truth test on predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#FindLast)]
[[play](https://go.dev/play/p/FFDPV_j7URd)]
- **<big>FindLastBy</big>** : iterates over elements of slice, returning the last one that passes a truth test on predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#FindLastBy)]
[[play](https://go.dev/play/p/8iqomzyCl_s)]
- **<big>Flatten</big>** : flattens slice one level.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Flatten)]
[[play](https://go.dev/play/p/hYa3cBEevtm)]
- **<big>FlattenDeep</big>** : flattens slice recursive to one level.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#FlattenDeep)]
[[play](https://go.dev/play/p/yjYNHPyCFaF)]
- **<big>FlatMap</big>** : manipulates a slice and transforms and flattens it to a slice of another type.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#FlatMap)]
[[play](https://go.dev/play/p/_QARWlWs1N_F)]
- **<big>ForEach</big>** : iterates over elements of slice and invokes function for each element.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ForEach)]
[[play](https://go.dev/play/p/DrPaa4YsHRF)]
- **<big>ForEachWithBreak</big>** : iterates over elements of slice and invokes function for each element, when iteratee return false, will break the for each loop.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ForEachWithBreak)]
[[play](https://go.dev/play/p/qScs39f3D9W)]
- **<big>ForEachConcurrent</big>** : applies the iteratee function to each item in the slice concurrently.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ForEachConcurrent)]
[[play](https://go.dev/play/p/kT4XW7DKVoV)]
- **<big>GroupBy</big>** : iterate over elements of the slice, each element will be group by criteria, returns two slices.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#GroupBy)]
[[play](https://go.dev/play/p/QVkPxzPR0iA)]
- **<big>GroupWith</big>** : return a map composed of keys generated from the results of running each element of slice thru iteratee.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#GroupWith)]
[[play](https://go.dev/play/p/ApCvMNTLO8a)]
- **<big>IntSlice<sup>deprecated</sup></big>** : convert param to int slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#IntSlice)]
[[play](https://go.dev/play/p/FdQXF0Vvqs-)]
- **<big>InterfaceSlice<sup>deprecated</sup></big>** : convert param to interface slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#InterfaceSlice)]
[[play](https://go.dev/play/p/FdQXF0Vvqs-)]
- **<big>Intersection</big>** : creates a slice of unique elements that included by all slices.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Intersection)]
[[play](https://go.dev/play/p/anJXfB5wq_t)]
- **<big>InsertAt</big>** : insert the value or other slice into slice at index.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#InsertAt)]
[[play](https://go.dev/play/p/hMLNxPEGJVE)]
- **<big>IndexOf</big>** : returns the index at which the first occurrence of an item is found in a slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#IndexOf)]
[[play](https://go.dev/play/p/MRN1f0FpABb)]
- **<big>LastIndexOf</big>** : returns the index at which the last occurrence of the item is found in a slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#LastIndexOf)]
[[play](https://go.dev/play/p/DokM4cf1IKH)]
- **<big>Map</big>** : creates an slice of values by running each element of slice thru iteratee function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Map)]
[[play](https://go.dev/play/p/biaTefqPquw)]
- **<big>MapConcurrent</big>** : applies the iteratee function to each item in the slice by concrrent.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#MapConcurrent)]
[[play](https://go.dev/play/p/H1ehfPkPen0)]
- **<big>Merge</big>** : merge all given slices into one slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Merge)]
[[play](https://go.dev/play/p/lbjFp784r9N)]
- **<big>Reverse</big>** : return slice of element order is reversed to the given slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Reverse)]
[[play](https://go.dev/play/p/8uI8f1lwNrQ)]
- **<big>Reduce<sup>deprecated</sup></big>** : creates an slice of values by running each element of slice thru iteratee function.(Deprecated: use ReduceBy)
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Reduce)]
[[play](https://go.dev/play/p/_RfXJJWIsIm)]
- **<big>ReduceBy</big>** : produces a value from slice by accumulating the result of each element as passed through the reducer function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ReduceBy)]
[[play](https://go.dev/play/p/YKDpLi7gtee)]
- **<big>ReduceRight</big>** : ReduceRight is like ReduceBy, but it iterates over elements of slice from right to left.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ReduceRight)]
[[play](https://go.dev/play/p/qT9dZC03A1K)]
- **<big>ReduceConcurrent</big>** : reduces the slice to a single value by applying the reducer function to each item in the slice concurrently.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ReduceConcurrent)]
[[play](https://go.dev/play/p/Tjwe6OtaG07)]
- **<big>Replace</big>** : returns a copy of the slice with the first n non-overlapping instances of old replaced by new.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Replace)]
[[play](https://go.dev/play/p/P5mZp7IhOFo)]
- **<big>ReplaceAll</big>** : returns a copy of the slice with all non-overlapping instances of old replaced by new.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ReplaceAll)]
[[play](https://go.dev/play/p/CzqXMsuYUrx)]
- **<big>Repeat</big>** : creates a slice with length n whose elements are passed item.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Repeat)]
[[play](https://go.dev/play/p/1CbOmtgILUU)]
- **<big>Shuffle</big>** : shuffle the slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Shuffle)]
[[play](https://go.dev/play/p/YHvhnWGU3Ge)]
- **<big>IsAscending</big>** : Checks if a slice is ascending order.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#IsAscending)]
[[play](https://go.dev/play/p/9CtsFjet4SH)]
- **<big>IsDescending</big>** : Checks if a slice is descending order.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#IsDescending)]
[[play](https://go.dev/play/p/U_LljFXma14)]
- **<big>IsSorted</big>** : Checks if a slice is sorted (ascending or descending).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#IsSorted)]
[[play](https://go.dev/play/p/nCE8wPLwSA-)]
- **<big>IsSortedByKey</big>** : Checks if a slice is sorted by iteratee function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#IsSortedByKey)]
[[play](https://go.dev/play/p/tUoGB7DOHI4)]
- **<big>Sort</big>** : sorts a slice of any ordered type(number or string).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Sort)]
[[play](https://go.dev/play/p/V9AVjzf_4Fk)]
- **<big>SortBy</big>** : sorts the slice in ascending order as determined by the less function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#SortBy)]
[[play](https://go.dev/play/p/DAhLQSZEumm)]
- **<big>SortByField<sup>deprecated</sup></big>** : return sorted slice by specific field.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#SortByField)]
[[play](https://go.dev/play/p/fU1prOBP9p1)]
- **<big>Some</big>** : return true if any of the values in the list pass the predicate function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Some)]
[[play](https://go.dev/play/p/4pO9Xf9NDGS)]
- **<big>StringSlice<sup>deprecated</sup></big>** : convert param to slice of string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#StringSlice)]
[[play](https://go.dev/play/p/W0TZDWCPFcI)]
- **<big>SymmetricDifference</big>** : the symmetric difference of two slice, also known as the disjunctive union.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#h42nJX5xMln)]
[[play](https://go.dev/play/p/1CbOmtgILUU)]
- **<big>ToSlice</big>** : returns a slices of a variable parameter transformation.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ToSlice)]
[[play](https://go.dev/play/p/YzbzVq5kscN)]
- **<big>ToSlicePointer</big>** : returns a pointer to the slices of a variable parameter transformation.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ToSlicePointer)]
[[play](https://go.dev/play/p/gx4tr6_VXSF)]
- **<big>Unique</big>** : remove duplicate elements in slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Unique)]
[[play](https://go.dev/play/p/AXw0R3ZTE6a)]
- **<big>UniqueBy</big>** : remove duplicate elements from the input slice based on the values returned by the iteratee function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#UniqueBy)]
[[play](https://go.dev/play/p/GY7JE4yikrl)]
- **<big>UniqueByComparator</big>** : remove duplicate elements from the input slice using the provided comparator function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#UniqueByComparator)]
[[play](https://go.dev/play/p/rwSacr-ZHsR)]
- **<big>UniqueByField</big>** : remove duplicate elements in struct slice by struct field.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#UniqueByField)]
[[play](https://go.dev/play/p/6cifcZSPIGu)]
- **<big>UniqueByConcurrent</big>** : remove duplicate elements from the slice by concurrent.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#UniqueByConcurrent)]
[[play](https://go.dev/play/p/wXZ7LcYRMGL)]
- **<big>Union</big>** : creates a slice of unique elements, in order, from all given slices.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Union)]
[[play](https://go.dev/play/p/hfXV1iRIZOf)]
- **<big>UnionBy</big>** : accepts iteratee which is invoked for each element of each slice, then union slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#UnionBy)]
[[play](https://go.dev/play/p/HGKHfxKQsFi)]
- **<big>UpdateAt</big>** : update the slice element at index.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#UpdateAt)]
[[play](https://go.dev/play/p/f3mh2KloWVm)]
- **<big>Without</big>** : creates a slice excluding all given items.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Without)]
[[play](https://go.dev/play/p/bwhEXEypThg)]
- **<big>KeyBy</big>** : converts a slice to a map based on a callback function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#KeyBy)]
[[play](https://go.dev/play/p/uXod2LWD1Kg)]
- **<big>Join</big>** : join the slice item with specify separator.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Join)]
[[play](https://go.dev/play/p/huKzqwNDD7V)]
- **<big>Partition</big>** : partition all slice elements with the evaluation of the given predicate functions.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Partition)]
[[play](https://go.dev/play/p/lkQ3Ri2NQhV)]
- **<big>Random</big>** : get a random item of slice, return its index, when slice is empty, return -1.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Random)]
[[play](https://go.dev/play/p/UzpGQptWppw)]
- **<big>SetToDefaultIf</big>** : set elements to their default value if they match the given predicate.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#SetToDefaultIf)]
[[play](https://go.dev/play/p/9AXGlPRC0-A)]
- **<big>Break</big>** : breaks a list into two parts at the point where the predicate for the first time is true.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Break)]
- **<big>RightPadding</big>** : adds padding to the right end of a slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#RightPadding)]
[[play](https://go.dev/play/p/0_2rlLEMBXL)]
- **<big>LeftPadding</big>** : adds padding to the left begin of a slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#LeftPadding)]
[[play](https://go.dev/play/p/jlQVoelLl2k)]
- **<big>Frequency</big>** : counts the frequency of each element in the slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#Frequency)]
[[play](https://go.dev/play/p/CW3UVNdUZOq)]
- **<big>JoinFunc</big>** : joins the slice elements into a single string with the given separator.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#JoinFunc)]
[[play](https://go.dev/play/p/55ib3SB5fM2)]
- **<big>ConcatBy</big>** : concats the elements of a slice into a single value using the provided separator and connector function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/slice.md#ConcatBy)]
[[play](https://go.dev/play/p/6QcUpcY4UMW)]
<h3 id="stream"> 19. Stream package implements a sequence of elements supporting sequential and operations. this package is an experiment to explore if stream in go can work as the way java does. its function is very limited. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/stream"
```
#### Function list:
- **<big>Of</big>** : creates a stream whose elements are the specified values.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Of)]
[[play](https://go.dev/play/p/jI6_iZZuVFE)]
- **<big>FromSlice</big>** : creates a stream from slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#FromSlice)]
[[play](https://go.dev/play/p/wywTO0XZtI4)]
- **<big>FromChannel</big>** : creates a stream from channel.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#FromChannel)]
[[play](https://go.dev/play/p/9TZYugGMhXZ)]
- **<big>FromRange</big>** : creates a number stream from start to end. both start and end are included. [start, end]
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#FromRange)]
[[play](https://go.dev/play/p/9Ex1-zcg-B-)]
- **<big>Generate</big>** : creates a stream where each element is generated by the provided generator function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Generate)]
[[play](https://go.dev/play/p/rkOWL1yA3j9)]
- **<big>Concat</big>** : creates a lazily concatenated stream whose elements are all the elements of the first stream followed by all the elements of the second stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Concat)]
[[play](https://go.dev/play/p/HM4OlYk_OUC)]
- **<big>Distinct</big>** : creates returns a stream that removes the duplicated items.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Distinct)]
[[play](https://go.dev/play/p/eGkOSrm64cB)]
- **<big>Filter</big>** : returns a stream consisting of the elements of this stream that match the given predicate.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Filter)]
[[play](https://go.dev/play/p/MFlSANo-buc)]
- **<big>FilterConcurrent</big>** : Applies the provided filter function `predicate` to each element of the input slice concurrently.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#FilterConcurrent)]
[[play](https://go.dev/play/p/t_pkwerIRVx)]
- **<big>Map</big>** : returns a stream consisting of the elements of this stream that apply the given function to elements of stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Map)]
[[play](https://go.dev/play/p/OtNQUImdYko)]
- **<big>Peek</big>** : returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed from the resulting stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Peek)]
[[play](https://go.dev/play/p/u1VNzHs6cb2)]
- **<big>Skip</big>** : returns a stream consisting of the remaining elements of this stream after discarding the first n elements of the stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Skip)]
[[play](https://go.dev/play/p/fNdHbqjahum)]
- **<big>Limit</big>** : returns a stream consisting of the elements of this stream, truncated to be no longer than maxSize in length.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Limit)]
[[play](https://go.dev/play/p/qsO4aniDcGf)]
- **<big>Reverse</big>** : returns a stream whose elements are reverse order of given stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Reverse)]
[[play](https://go.dev/play/p/A8_zkJnLHm4)]
- **<big>Range</big>** : returns a stream whose elements are in the range from start(included) to end(excluded) original stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Range)]
[[play](https://go.dev/play/p/indZY5V2f4j)]
- **<big>Sorted</big>** : returns a stream consisting of the elements of this stream, sorted according to the provided less function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Sorted)]
[[play](https://go.dev/play/p/XXtng5uonFj)]
- **<big>ForEach</big>** : performs an action for each element of this stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#ForEach)]
[[play](https://go.dev/play/p/Dsm0fPqcidk)]
- **<big>Reduce</big>** : performs a reduction on the elements of this stream, using an associative accumulation function, and returns an Optional describing the reduced value, if any.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Reduce)]
[[play](https://go.dev/play/p/6uzZjq_DJLU)]
- **<big>FindFirst</big>** : returns the first element of this stream and true, or zero value and false if the stream is empty.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#FindFirst)]
[[play](https://go.dev/play/p/9xEf0-6C1e3)]
- **<big>FindLast</big>** : returns the last element of this stream and true, or zero value and false if the stream is empty.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#FindLast)]
[[play](https://go.dev/play/p/WZD2rDAW-2h)]
- **<big>Max</big>** : returns the maximum element of this stream according to the provided less function. less function: a > b
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Max)]
[[play](https://go.dev/play/p/fm-1KOPtGzn)]
- **<big>Min</big>** : returns the minimum element of this stream according to the provided less function. less function: a < b
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Min)]
[[play](https://go.dev/play/p/vZfIDgGNRe_0)]
- **<big>AllMatch</big>** : returns whether all elements of this stream match the provided predicate.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#AllMatch)]
[[play](https://go.dev/play/p/V5TBpVRs-Cx)]
- **<big>AnyMatch</big>** : returns whether any elements of this stream match the provided predicate.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#AnyMatch)]
[[play](https://go.dev/play/p/PTCnWn4OxSn)]
- **<big>NoneMatch</big>** : returns whether no elements of this stream match the provided predicate.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#NoneMatch)]
[[play](https://go.dev/play/p/iWS64pL1oo3)]
- **<big>Count</big>** : returns the count of elements in the stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#Count)]
[[play](https://go.dev/play/p/r3koY6y_Xo-)]
- **<big>ToSlice</big>** : returns the elements in the stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#ToSlice)]
[[play](https://go.dev/play/p/jI6_iZZuVFE)]
- **<big>IndexOf</big>** : returns the index of the first occurrence of the specified element in this stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#IndexOf)]
[[play](https://go.dev/play/p/tBV5Nc-XDX2)]
- **<big>LastIndexOf</big>** : returns the index of the last occurrence of the specified element in this stream.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/stream.md#LastIndexOf)]
[[play](https://go.dev/play/p/CjeoNw2eac_G)]
<h3 id="structs"> 20. Structs package provides several high level functions to manipulate struct, tag, and field. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/structs"
```
#### Function list:
- **<big>New</big>** : creates a `Struct` instance.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#New)]
- **<big>ToMap</big>** : converts a valid struct to a map.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#ToMap)]
- **<big>Fields</big>** : get all fields of a given struct, that the fields are abstract struct field.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#Fields)]
- **<big>IsStruct</big>** : check if the struct is valid.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#IsStruct)]
- **<big>Tag</big>** : get a `Tag` of the `Field`, `Tag` is a abstract struct field tag.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#Tag)]
- **<big>Name</big>** : get the field name.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#Name)]
- **<big>Value</big>** : get the `Field` underlying value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#Value)]
- **<big>Kind</big>** : get the field's kind.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#Kind)]
- **<big>IsEmbedded</big>** : check if the field is an embedded field.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#IsEmbedded)]
- **<big>IsExported</big>** : check if the field is exported.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#IsExported)]
- **<big>IsZero</big>** : check if the field is zero value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#IsZero)]
- **<big>IsSlice</big>** : check if the field is a slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#IsSlice)]
- **<big>IsTargetType</big>** : check if the field is target type.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/struct.md#IsTargetType)]
<h3 id="strutil"> 21. Strutil package contains some functions to manipulate string. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/strutil"
```
#### Function list:
- **<big>After</big>** : returns the substring after the first occurrence of a specific string in the source string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#After)]
[[play](https://go.dev/play/p/RbCOQqCDA7m)]
- **<big>AfterLast</big>** : returns the substring after the last occurrence of a specific string in the source string. [[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#AfterLast)]
[[play](https://go.dev/play/p/1TegARrb8Yn)]
- **<big>Before</big>** : returns the substring before the first occurrence of a specific string in the source string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Before)]
[[play](https://go.dev/play/p/JAWTZDS4F5w)]
- **<big>BeforeLast</big>** : returns the substring before the last occurrence of a specific string in the source string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#BeforeLast)]
[[play](https://go.dev/play/p/pJfXXAoG_Te)]
- **<big>CamelCase</big>** : coverts source string to its camelCase string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#CamelCase)]
[[play](https://go.dev/play/p/9eXP3tn2tUy)]
- **<big>Capitalize</big>** : converts the first character of source string to upper case and the remaining to lower case.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Capitalize)]
[[play](https://go.dev/play/p/2OAjgbmAqHZ)]
- **<big>ContainsAll</big>** : return true if target string contains all the substrings.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#ContainsAll)]
[[play](https://go.dev/play/p/KECtK2Os4zq)]
- **<big>ContainsAny</big>** : return true if target string contains any one of the substrings.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#ContainsAny)]
[[play](https://go.dev/play/p/dZGSSMB3LXE)]
- **<big>IsString</big>** : checks if the parameter value data type is string or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#IsString)]
[[play](https://go.dev/play/p/IOgq7oF9ERm)]
- **<big>KebabCase</big>** : coverts string to kebab-case string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#KebabCase)]
[[play](https://go.dev/play/p/dcZM9Oahw-Y)]
- **<big>UpperKebabCase</big>** : coverts string to upper KEBAB-CASE string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#UpperKebabCase)]
[[play](https://go.dev/play/p/zDyKNneyQXk)]
- **<big>LowerFirst</big>** : converts the first character of string to lower case.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#LowerFirst)]
[[play](https://go.dev/play/p/CbzAyZmtJwL)]
- **<big>UpperFirst</big>** : converts the first character of string to upper case.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#UpperFirst)]
[[play](https://go.dev/play/p/sBbBxRbs8MM)]
- **<big>Pad</big>** : pads string on the left and right side if it's shorter than size.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Pad)]
[[play](https://go.dev/play/p/NzImQq-VF8q)]
- **<big>PadEnd</big>** : pads string with given characters on the right side if it's shorter than limit size. Padding characters are truncated if they exceed size.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#PadEnd)]
[[play](https://go.dev/play/p/9xP8rN0vz--)]
- **<big>PadStart</big>** : pads string with given characters on the left side if it's shorter than limit size. Padding characters are truncated if they exceed size.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#PadStart)]
[[play](https://go.dev/play/p/xpTfzArDfvT)]
- **<big>Reverse</big>** : returns string whose char order is reversed to the given string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Reverse)]
[[play](https://go.dev/play/p/adfwalJiecD)]
- **<big>SnakeCase</big>** : coverts string to snake_case string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#SnakeCase)]
[[play](https://go.dev/play/p/tgzQG11qBuN)]
- **<big>UpperSnakeCase</big>** : coverts string to upper SNAKE_CASE string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#UpperSnakeCase)]
[[play](https://go.dev/play/p/4COPHpnLx38)]
- **<big>SplitEx</big>** : split a given string which can control the result slice contains empty string or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#SplitEx)]
[[play](https://go.dev/play/p/Us-ySSbWh-3)]
- **<big>Substring</big>** : returns a substring of the specific length starting at the specific offset position.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Substring)]
[[play](https://go.dev/play/p/q3sM6ehnPDp)]
- **<big>Wrap</big>** : wrap a string with given string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Wrap)]
[[play](https://go.dev/play/p/KoZOlZDDt9y)]
- **<big>Unwrap</big>** : unwrap a given string from anther string. will change source string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Unwrap)]
[[play](https://go.dev/play/p/Ec2q4BzCpG-)]
- **<big>SplitWords</big>** : splits a string into words, word only contains alphabetic characters.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#SplitWords)]
[[play](https://go.dev/play/p/KLiX4WiysMM)]
- **<big>WordCount</big>** : return the number of meaningful word of a string, word only contains alphabetic characters.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#WordCount)]
[[play](https://go.dev/play/p/bj7_odx3vRf)]
- **<big>RemoveNonPrintable</big>** : remove non-printable characters from a string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#RemoveNonPrintable)]
[[play](https://go.dev/play/p/og47F5x_jTZ)]
- **<big>StringToBytes</big>** : converts a string to byte slice without a memory allocation.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#StringToBytes)]
[[play](https://go.dev/play/p/7OyFBrf9AxA)]
- **<big>BytesToString</big>** : converts a byte slice to string without a memory allocation.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#BytesToString)]
[[play](https://go.dev/play/p/6c68HRvJecH)]
- **<big>IsBlank</big>** : checks if a string is whitespace or empty.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#IsBlank)]
[[play](https://go.dev/play/p/6zXRH_c0Qd3)]
- **<big>IsNotBlank</big>** : checks if a string is not whitespace or not empty.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#IsNotBlank)]
[[play](https://go.dev/play/p/e_oJW0RAquA)]
- **<big>HasPrefixAny</big>** : checks if a string starts with any of an array of specified strings.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#HasPrefixAny)]
[[play](https://go.dev/play/p/8UUTl2C5slo)]
- **<big>HasSuffixAny</big>** : checks if a string ends with any of an array of specified strings.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#HasSuffixAny)]
[[play](https://go.dev/play/p/sKWpCQdOVkx)]
- **<big>IndexOffset</big>** : returns the index of the first instance of substr in string after offsetting the string by `idxFrom`.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#IndexOffset)]
[[play](https://go.dev/play/p/qZo4lV2fomB)]
- **<big>ReplaceWithMap</big>** : returns a copy of `str`, which is replaced by a map in unordered way, case-sensitively.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#ReplaceWithMap)]
[[play](https://go.dev/play/p/h3t7CNj2Vvu)]
- **<big>Trim</big>** : strips whitespace (or other characters) from the beginning and end of a string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Trim)]
[[play](https://go.dev/play/p/Y0ilP0NRV3j)]
- **<big>SplitAndTrim</big>** : splits string `str` by a string `delimiter` to a slice, and calls Trim to every element of slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#SplitAndTrim)]
[[play](https://go.dev/play/p/ZNL6o4SkYQ7)]
- **<big>HideString</big>** : Hide some chars in source string with param `replaceChar`.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#HideString)]
[[play](https://go.dev/play/p/pzbaIVCTreZ)]
- **<big>RemoveWhiteSpace</big>** : remove whitespace characters from a string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#RemoveWhiteSpace)]
[[play](https://go.dev/play/p/HzLC9vsTwkf)]
- **<big>SubInBetween</big>** : return substring between the start and end position(excluded) of source string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#SubInBetween)]
[[play](https://go.dev/play/p/EDbaRvjeNsv)]
- **<big>HammingDistance</big>** : calculates the Hamming distance between two strings.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#HammingDistance)]
[[play](https://go.dev/play/p/glNdQEA9HUi)]
- **<big>Concat</big>** : concatenates strings.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Concat)]
[[play](https://go.dev/play/p/gD52SZHr4Kp)]
- **<big>Ellipsis</big>** : truncates a string to a specified length and appends an ellipsis.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Ellipsis)]
[[play](https://go.dev/play/p/i1vbdQiQVRR)]
- **<big>Shuffle</big>** : shuffle the order of characters of given string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Shuffle)]
[[play](https://go.dev/play/p/iStFwBwyGY7)]
- **<big>Rotate</big>** : rotates the string by the specified number of characters.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Rotate)]
[[play](https://go.dev/play/p/Kf03iOeT5bd)]
- **<big>TemplateReplace</big>** : replaces the placeholders in the template string with the corresponding values in the data map.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#TemplateReplace)]
[[play](https://go.dev/play/p/cXSuFvyZqv9)]
- **<big>RegexMatchAllGroups</big>** : matches all subgroups in a string using a regular expression and returns the result.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#RegexMatchAllGroups)]
[[play](https://go.dev/play/p/JZiu0RXpgN-)]
- **<big>ExtractContent</big>** : extracts the content between the start and end strings in the source string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#ExtractContent)]
[[play](https://go.dev/play/p/Ay9UIk7Rum9)]
<h3 id="system"> 22. System package contain some functions about os, runtime, shell command. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/system"
```
#### Function list:
- **<big>IsWindows</big>** : check if current os is windows.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#IsWindows)]
[[play](https://go.dev/play/p/XzJULbzmf9m)]
- **<big>IsLinux</big>** : check if current os is linux.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#IsLinux)]
[[play](https://go.dev/play/p/zIflQgZNuxD)]
- **<big>IsMac</big>** : check if current os is macos.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#IsMac)]
[[play](https://go.dev/play/p/Mg4Hjtyq7Zc)]
- **<big>GetOsEnv</big>** : get the value of the environment variable named by the key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#GetOsEnv)]
[[play](https://go.dev/play/p/D88OYVCyjO-)]
- **<big>SetOsEnv</big>** : set the value of the environment variable named by the key.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#SetOsEnv)]
[[play](https://go.dev/play/p/D88OYVCyjO-)]
- **<big>RemoveOsEnv</big>** : remove a single environment variable.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#RemoveOsEnv)]
[[play](https://go.dev/play/p/fqyq4b3xUFQ)]
- **<big>CompareOsEnv</big>** : get env named by the key and compare it with passed env.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#CompareOsEnv)]
[[play](https://go.dev/play/p/BciHrKYOHbp)]
- **<big>ExecCommand</big>** : execute command, return the stdout and stderr string of command, and error if error occurs.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#ExecCommand)]
[[play](https://go.dev/play/p/n-2fLyZef-4)]
- **<big>GetOsBits</big>** : return current os bits (32 or 64).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#GetOsBits)]
[[play](https://go.dev/play/p/ml-_XH3gJbW)]
- **<big>StartProcess</big>** : start a new process with the specified name and arguments.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#StartProcess)]
[[play](https://go.dev/play/p/5GVol6ryS_X)]
- **<big>StopProcess</big>** : stop a process by pid.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#StopProcess)]
[[play](https://go.dev/play/p/jJZhRYGGcmD)]
- **<big>KillProcess</big>** : kill a new process with the specified name and arguments.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#KillProcess)]
[[play](https://go.dev/play/p/XKmvV-ExBWa)]
- **<big>GetProcessInfo</big>** : retrieves detailed process information by pid.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/system.md#GetProcessInfo)]
[[play](https://go.dev/play/p/NQDVywEYYx7)]
<h3 id="tuple"> 23. Tuple package implements tuple data type and some operations on it. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/tuple"
```
#### Function list:
- **<big>Tuple2</big>** : represents a 2 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple2)]
[[play](https://go.dev/play/p/3sHVqBQpLYN)]
- **<big>Tuple2_Unbox</big>** : returns values in Tuple2.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple2_Unbox)]
[[play](https://go.dev/play/p/0fD1qfCVwjm)]
- **<big>Zip2</big>** : create a slice of Tuple2, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip2)]
[[play](https://go.dev/play/p/4ncWJJ77Xio)]
- **<big>Unzip2</big>** : create a group of slice from a slice of Tuple2.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip2)]
[[play](https://go.dev/play/p/KBecr60feXb)]
- **<big>Tuple3</big>** : represents a 3 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple3)]
[[play](https://go.dev/play/p/FtH2sdCLlCf)]
- **<big>Tuple3_Unbox</big>** : returns values in Tuple3.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple3_Unbox)]
[[play](https://go.dev/play/p/YojLy-id1BS)]
- **<big>Zip3</big>** : create a slice of Tuple3, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip3)]
[[play](https://go.dev/play/p/97NgmsTILfu)]
- **<big>Unzip3</big>** : create a group of slice from a slice of Tuple3.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip3)]
[[play](https://go.dev/play/p/bba4cpAa7KO)]
- **<big>Tuple4</big>** : represents a 4 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple4)]
[[play](https://go.dev/play/p/D2EqDz096tk)]
- **<big>Tuple4_Unbox</big>** : returns values in Tuple4.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple4_Unbox)]
[[play](https://go.dev/play/p/ACj9YuACGgW)]
- **<big>Zip4</big>** : create a slice of Tuple4, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip4)]
[[play](https://go.dev/play/p/PEmTYVK5hL4)]
- **<big>Unzip4</big>** : create a group of slice from a slice of Tuple4.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip4)]
[[play](https://go.dev/play/p/rb8z4gyYSRN)]
- **<big>Tuple5</big>** : represents a 5 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple5)]
[[play](https://go.dev/play/p/2WndmVxPg-r)]
- **<big>Tuple5_Unbox</big>** : returns values in Tuple4.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple5_Unbox)]
[[play](https://go.dev/play/p/GyIyZHjCvoS)]
- **<big>Zip5</big>** : create a slice of Tuple5, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip5)]
[[play](https://go.dev/play/p/fCAAJLMfBIP)]
- **<big>Unzip5</big>** : create a group of slice from a slice of Tuple5.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip5)]
[[play](https://go.dev/play/p/gyl6vKfhqPb)]
- **<big>Tuple6</big>** : represents a 6 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple6)]
[[play](https://go.dev/play/p/VjqcCwEJZbs)]
- **<big>Tuple6_Unbox</big>** : returns values in Tuple6.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple6_Unbox)]
[[play](https://go.dev/play/p/FjIHV7lpxmW)]
- **<big>Zip6</big>** : create a slice of Tuple6, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip6)]
[[play](https://go.dev/play/p/oWPrnUYuFHo)]
- **<big>Unzip6</big>** : create a group of slice from a slice of Tuple6.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip6)]
[[play](https://go.dev/play/p/l41XFqCyh5E)]
- **<big>Tuple7</big>** : represents a 7 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple7)]
[[play](https://go.dev/play/p/dzAgv_Ezub9)]
- **<big>Tuple7_Unbox</big>** : returns values in Tuple7.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple7_Unbox)]
[[play](https://go.dev/play/p/R9I8qeDk0zs)]
- **<big>Zip7</big>** : create a slice of Tuple7, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip7)]
[[play](https://go.dev/play/p/WUJuo897Egf)]
- **<big>Unzip7</big>** : create a group of slice from a slice of Tuple7.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip7)]
[[play](https://go.dev/play/p/hws_P1Fr2j3)]
- **<big>Tuple8</big>** : represents a 8 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple8)]
[[play](https://go.dev/play/p/YA9S0rz3dRz)]
- **<big>Tuple8_Unbox</big>** : returns values in Tuple8.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple8_Unbox)]
[[play](https://go.dev/play/p/PRxLBBb4SMl)]
- **<big>Zip8</big>** : create a slice of Tuple8, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip8)]
[[play](https://go.dev/play/p/8V9jWkuJfaQ)]
- **<big>Unzip8</big>** : create a group of slice from a slice of Tuple8.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip8)]
[[play](https://go.dev/play/p/1SndOwGsZB4)]
- **<big>Tuple9</big>** : represents a 9 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple9)]
[[play](https://go.dev/play/p/yS2NGGtZpQr)]
- **<big>Tuple9_Unbox</big>** : returns values in Tuple9.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple9_Unbox)]
[[play](https://go.dev/play/p/oFJFGTAuOa8)]
- **<big>Zip9</big>** : create a slice of Tuple9, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip9)]
[[play](https://go.dev/play/p/cgsL15QYnfz)]
- **<big>Unzip9</big>** : create a group of slice from a slice of Tuple9.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip9)]
[[play](https://go.dev/play/p/91-BU_KURSA)]
- **<big>Tuple10</big>** : represents a 10 elements tuple.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple10)]
[[play](https://go.dev/play/p/799qqZg0hUv)]
- **<big>Tuple10_Unbox</big>** : returns values in Tuple10.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Tuple10_Unbox)]
[[play](https://go.dev/play/p/qfyx3x_X0Cu)]
- **<big>Zip10</big>** : create a slice of Tuple10, whose elements are correspond to the given slice elements.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Zip10)]
[[play](https://go.dev/play/p/YSR-2cXnrY4)]
- **<big>Unzip10</big>** : create a group of slice from a slice of Tuple10.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/tuple.md#Unzip10)]
[[play](https://go.dev/play/p/-taQB6Wfre_z)]
<h3 id="validator"> 24. Validator package contains some functions for data validation. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/validator"
```
#### Function list:
- **<big>ContainChinese</big>** : check if the string contain mandarin chinese.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#ContainChinese)]
[[play](https://go.dev/play/p/7DpU0uElYeM)]
- **<big>ContainLetter</big>** : check if the string contain at least one letter.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#ContainLetter)]
[[play](https://go.dev/play/p/lqFD04Yyewp)]
- **<big>ContainLower</big>** : check if the string contain at least one lower case letter a-z.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#ContainLower)]
[[play](https://go.dev/play/p/Srqi1ItvnAA)]
- **<big>ContainUpper</big>** : check if the string contain at least one upper case letter A-Z.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#ContainUpper)]
[[play](https://go.dev/play/p/CmWeBEk27-z)]
- **<big>IsAlpha</big>** : checks if the string contains only letters (a-zA-Z).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsAlpha)]
[[play](https://go.dev/play/p/7Q5sGOz2izQ)]
- **<big>IsAllUpper</big>** : check if the string is all upper case letters A-Z.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsAllUpper)]
[[play](https://go.dev/play/p/ZHctgeK1n4Z)]
- **<big>IsAllLower</big>** : check if the string is all lower case letters a-z.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsAllLower)]
[[play](https://go.dev/play/p/GjqCnOfV6cM)]
- **<big>IsBase64</big>** : check if the string is base64 string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsBase64)]
[[play](https://go.dev/play/p/sWHEySAt6hl)]
- **<big>IsChineseMobile</big>** : check if the string is chinese mobile number.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsChineseMobile)]
[[play](https://go.dev/play/p/GPYUlGTOqe3)]
- **<big>IsChineseIdNum</big>** : check if the string is chinese id card.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsChineseIdNum)]
[[play](https://go.dev/play/p/d8EWhl2UGDF)]
- **<big>IsChinesePhone</big>** : check if the string is chinese phone number.(xxx-xxxxxxxx or xxxx-xxxxxxx.)
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsChinesePhone)]
[[play](https://go.dev/play/p/RUD_-7YZJ3I)]
- **<big>IsCreditCard</big>** : check if the string is credit card.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsCreditCard)]
[[play](https://go.dev/play/p/sNwwL6B0-v4)]
- **<big>IsDns</big>** : check if the string is dns.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsDns)]
[[play](https://go.dev/play/p/jlYApVLLGTZ)]
- **<big>IsEmail</big>** : check if the string is a email address.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsEmail)]
[[play](https://go.dev/play/p/Os9VaFlT33G)]
- **<big>IsEmptyString</big>** : check if the string is empty.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsEmptyString)]
[[play](https://go.dev/play/p/dpzgUjFnBCX)]
- **<big>IsFloat</big>** : check if the value is float(float32, float34) or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsFloat)]
[[play](https://go.dev/play/p/vsyG-sxr99_Z)]
- **<big>IsFloatStr</big>** : check if the string can convert to a float.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsFloatStr)]
[[play](https://go.dev/play/p/LOYwS_Oyl7U)]
- **<big>IsNumber</big>** : check if the value is number(integer, float) or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsNumber)]
[[play](https://go.dev/play/p/mdJHOAvtsvF)]
- **<big>IsNumberStr</big>** : check if the string can convert to a number.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsNumberStr)]
[[play](https://go.dev/play/p/LzaKocSV79u)]
- **<big>IsJSON</big>** : check if the string is valid JSON.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsJSON)]
[[play](https://go.dev/play/p/8Kip1Itjiil)]
- **<big>IsRegexMatch</big>** : check if the string match the regexp.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsRegexMatch)]
[[play](https://go.dev/play/p/z_XeZo_litG)]
- **<big>IsInt</big>** : check if the string can convert to a number.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsInt)]
[[play](https://go.dev/play/p/eFoIHbgzl-z)]
- **<big>IsIntStr</big>** : check if the string can convert to a integer.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsIntStr)]
[[play](https://go.dev/play/p/jQRtFv-a0Rk)]
- **<big>IsIp</big>** : check if the string is ip.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsIp)]
[[play](https://go.dev/play/p/FgcplDvmxoD)]
- **<big>IsIpV4</big>** : check if the string is ipv4.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsIpV4)]
[[play](https://go.dev/play/p/zBGT99EjaIu)]
- **<big>IsIpV6</big>** : check if the string is ipv6.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsIpV6)]
[[play](https://go.dev/play/p/AHA0r0AzIdC)]
- **<big>IsStrongPassword</big>** : check if the string is strong password.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsStrongPassword)]
[[play](https://go.dev/play/p/QHdVcSQ3uDg)]
- **<big>IsUrl</big>** : check if the string is url.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsUrl)]
[[play](https://go.dev/play/p/pbJGa7F98Ka)]
- **<big>IsWeakPassword</big>** : check if the string is weak password.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsWeakPassword)]
[[play](https://go.dev/play/p/wqakscZH5gH)]
- **<big>IsZeroValue</big>** : check if value is a zero value.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsZeroValue)]
[[play](https://go.dev/play/p/UMrwaDCi_t4)]
- **<big>IsGBK</big>** : check if data encoding is gbk.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsGBK)]
[[play](https://go.dev/play/p/E2nt3unlmzP)]
- **<big>IsASCII</big>** : checks if string is all ASCII char.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsASCII)]
[[play](https://go.dev/play/p/hfQNPLX0jNa)]
- **<big>IsPrintable</big>** : checks if string is all printable chars.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsPrintable)]
[[play](https://go.dev/play/p/Pe1FE2gdtTP)]
- **<big>IsBin</big>** : check if a give string is a valid binary value or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsBin)]
[[play](https://go.dev/play/p/ogPeg2XJH4P)]
- **<big>IsHex</big>** : check if a give string is a valid hexadecimal value or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsHex)]
[[play](https://go.dev/play/p/M2qpHbEwmm7)]
- **<big>IsBase64URL</big>** : check if a give string is a valid URL-safe Base64 encoded string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsBase64URL)]
[[play](https://go.dev/play/p/vhl4mr8GZ6S)]
- **<big>IsJWT</big>** : check if a give string is a valid JSON Web Token (JWT).
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsJWT)]
[[play](https://go.dev/play/p/R6Op7heJbKI)]
- **<big>IsVisa</big>** : check if a give string is a valid visa card number or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsVisa)]
[[play](https://go.dev/play/p/SdS2keOyJsl)]
- **<big>IsMasterCard</big>** : check if a give string is a valid master card number or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsMasterCard)]
[[play](https://go.dev/play/p/CwWBFRrG27b)]
- **<big>IsAmericanExpress</big>** : check if a give string is a valid american expression card number or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsAmericanExpress)]
[[play](https://go.dev/play/p/HIDFpcOdpkd)]
- **<big>IsUnionPay</big>** : check if a give string is a valid union pay number or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsUnionPay)]
[[play](https://go.dev/play/p/CUHPEwEITDf)]
- **<big>IsChinaUnionPay</big>** : check if a give string is a valid china union pay number or not.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/validator.md#IsChinaUnionPay)]
[[play](https://go.dev/play/p/yafpdxLiymu)]
<h3 id="xerror"> 25. Xerror package implements helpers for errors. <a href="#index">index</a></h3>
```go
import "github.com/duke-git/lancet/v2/xerror"
```
#### Function list:
- **<big>New</big>** : creates a new XError pointer instance with message.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#New)]
[[play](https://go.dev/play/p/w4oWZts7q7f)]
- **<big>Wrap</big>** : creates a new XError pointer instance based on error object, and add message.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#Wrap)]
[[play](https://go.dev/play/p/5385qT2dCi4)]
- **<big>Unwrap</big>** : returns unwrapped XError from err by errors.As. If no XError, returns nil.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#Unwrap)]
[[play](https://go.dev/play/p/LKMLep723tu)]
- **<big>XError_Wrap</big>** : creates a new XError and copy message and id to new one.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_Wrap)]
[[play](https://go.dev/play/p/RpjJ5u5sc97)]
- **<big>XError_Unwrap</big>** : Compatible with github.com/pkg/errors.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_Unwrap)]
[[play](https://go.dev/play/p/VUXJ8BST4c6)]
- **<big>XError_With</big>** : adds key and value related to the XError object.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_With)]
[[play](https://go.dev/play/p/ow8UISXX_Dp)]
- **<big>XError_Id</big>** : sets XError object id to check equality in XError.Is.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_Id)]
[[play](https://go.dev/play/p/X6HBlsy58U9)]
- **<big>XError_Is</big>** : checks if target error is XError and Error.id of two errors are matched.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_Is)]
[[play](https://go.dev/play/p/X6HBlsy58U9)]
- **<big>XError_Values</big>** : returns map of key and value that is set by XError.With function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_Values)]
[[play](https://go.dev/play/p/ow8UISXX_Dp)]
- **<big>XError_StackTrace</big>** : returns stack trace which is compatible with pkg/errors.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_StackTrace)]
[[play](https://go.dev/play/p/6FAvSQpa7pc)]
- **<big>XError_Info</big>** : returns information of xerror, which can be printed.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_Info)]
[[play](https://go.dev/play/p/1ZX0ME1F-Jb)]
- **<big>XError_Error</big>** : implements standard error interface.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#XError_Error)]
[[play](https://go.dev/play/p/w4oWZts7q7f)]
- **<big>TryUnwrap</big>** : check if err is nil then it returns a valid value. If err is not nil, TryUnwrap panics with err.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#TryUnwrap)]
[[play](https://go.dev/play/p/acyZVkNZEeW)]
- **<big>TryCatch</big>** : simple simulation of Java-style try-catch.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/xerror.md#TryCatch)]
[[play](https://go.dev/play/p/D5Mdb0mRj0P)]
## How to Contribute
#### [Contribution Guide](./CONTRIBUTION.md)
## Contributors
Thank you to all the people who contributed to lancet!
<a href="https://github.com/duke-git/lancet/graphs/contributors">
<img src="https://contrib.rocks/image?repo=duke-git/lancet" />
</a>
## Star History
[![Star History Chart](https://api.star-history.com/svg?repos=duke-git/lancet&type=Date)](https://star-history.com/#duke-git/lancet&Date)
", Assign "at most 3 tags" to the expected json: {"id":"6363","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"