https://github.com/duke-git/lancet
A comprehensive, efficient, and reusable util function library of Go.
https://github.com/duke-git/lancet
generics go golang library lodash utils
Last synced: 3 months ago
JSON representation
A comprehensive, efficient, and reusable util function library of Go.
- Host: GitHub
- URL: https://github.com/duke-git/lancet
- Owner: duke-git
- License: mit
- Created: 2021-11-28T13:18:19.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2026-01-13T06:00:44.000Z (5 months ago)
- Last Synced: 2026-01-24T06:51:58.051Z (5 months ago)
- Topics: generics, go, golang, library, lodash, utils
- Language: Go
- Homepage: https://www.golancet.cn/en/
- Size: 5.86 MB
- Stars: 5,259
- Watchers: 44
- Forks: 522
- Open Issues: 9
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
- Security: SECURITY.md
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README
[](https://github.com/duke-git/lancet/releases)
[](https://pkg.go.dev/github.com/duke-git/lancet/v2)
[](https://goreportcard.com/report/github.com/duke-git/lancet/v2)
[](https://github.com/duke-git/lancet/actions/workflows/codecov.yml)
[](https://codecov.io/gh/duke-git/lancet)
[](https://github.com/duke-git/lancet/blob/main/LICENSE)
[](https://gurubase.io/g/lancet)
Lancet is a comprehensive, efficient, and reusable util function library of go. Inspired by the java apache common package and lodash.js.
## Website | [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. 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.
```go
go get github.com/duke-git/lancet/v2 // will install latest version of v2.x.x
```
2. For users who use version below go1.18, you should install v1.x.x. The latest of v1.x.x is v1.4.6.
```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
### Index
- [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)
1. Algorithm package implements some basic algorithm. eg. sort, search. index
```go
import "github.com/duke-git/lancet/v2/algorithm"
```
#### Function list:
- **BubbleSort** : 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)]
- **CountSort** : 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)]
- **HeapSort** : 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)]
- **InsertionSort** : 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)]
- **MergeSort** : 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)]
- **QuickSort** : 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)]
- **SelectionSort** : 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)]
- **ShellSort** : 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)]
- **BinarySearch** : 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)]
- **BinaryIterativeSearch** : 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)]
- **LinearSearch** : 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)]
- **LRUCache** : 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)]
2. Compare package provides a lightweight comparison function on any type. index
```go
import "github.com/duke-git/lancet/v2/compare"
```
#### Function list:
- **Equal** : 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)]
- **EqualValue** : 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)]
- **LessThan** : 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)]
- **GreaterThan** : 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)]
- **LessOrEqual** : 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)]
- **GreaterOrEqual** : 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)]
- **InDelta** : 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)]
3. Concurrency package contain some functions to support concurrent programming. eg, goroutine, channel, async. index
```go
import "github.com/duke-git/lancet/v2/concurrency"
```
#### Function list:
- **NewChannel** : 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)]
- **Bridge** : 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)]
- **FanIn** : 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)]
- **Generate** : 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)]
- **Or** : 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)]
- **OrDone** : 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)]
- **Repeat** : 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)]
- **RepeatFn** : 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)]
- **Take** : 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)]
- **Tee** : 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)]
4. Condition package contains some functions for conditional judgment. eg. And, Or, TernaryOperator... index
```go
import "github.com/duke-git/lancet/v2/condition"
```
#### Function list:
- **Bool** : 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)]
- **And** : 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)]
- **Or** : 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)]
- **Xor** : 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)]
- **Nor** : 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)]
- **Xnor** : 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)]
- **Nand** : 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)]
- **TernaryOperator** : 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)]
5. Convertor package contains some functions for data conversion. index
```go
import "github.com/duke-git/lancet/v2/convertor"
```
#### Function list:
- **ColorHexToRGB** : 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)]
- **ColorRGBToHex** : 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)]
- **ToBool** : 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)]
- **ToBytes** : 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)]
- **ToChar** : 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)]
- **ToChannel** : 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)]
- **ToFloat** : 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)]
- **ToInt** : 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)]
- **ToJson** : 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)]
- **ToMap** : 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)]
- **ToPointer** : 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)]
- **ToString** : 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)]
- **StructToMap** : 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)]
- **MapToSlice** : 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)]
- **EncodeByte** : 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)]
- **DecodeByte** : 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)]
- **DeepClone** : 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)]
- **CopyProperties** : 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)]
- **ToInterface** : 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)]
- **Utf8ToGbk** : 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)]
- **GbkToUtf8** : 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)]
- **ToStdBase64** : 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)]
- **ToUrlBase64** : 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)]
- **ToRawStdBase64** : 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)]
- **ToRawUrlBase64** : 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)]
- **ToBigInt** : 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)]
6. Cryptor package is for data encryption and decryption. index
```go
import "github.com/duke-git/lancet/v2/cryptor"
```
#### Function list:
- **AesEcbEncrypt** : 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)]
- **AesEcbDecrypt** : 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)]
- **AesCbcEncrypt** : 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)]
- **AesCbcDecrypt** : 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)]
- **AesCtrCrypt** : 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)]
- **AesCfbEncrypt** : 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)]
- **AesCfbDecrypt** : 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)]
- **AesOfbEncrypt** : 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)]
- **AesOfbDecrypt** : 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)]
- **AesGcmEncrypt** : 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)]
- **AesGcmDecrypt** : 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)]
- **Base64StdEncode** : 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)]
- **Base64StdDecode** : 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)]
- **DesEcbEncrypt** : 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)]
- **DesEcbDecrypt** : 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)]
- **DesCbcEncrypt** : 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)]
- **DesCbcDecrypt** : 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)]
- **DesCtrCrypt** : 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)]
- **DesCfbEncrypt** : 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)]
- **DesCfbDecrypt** : 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)]
- **DesOfbEncrypt** : 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)]
- **DesOfbDecrypt** : 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)]
- **HmacMd5** : 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)]
- **HmacMd5WithBase64** : return the md5 hmac hash of base64 string.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#HmacMd5WithBase64)]
- **HmacSha1** : 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)]
- **HmacSha1WithBase64** : 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)]
- **HmacSha256** : 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)]
- **HmacSha256WithBase64** : 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)]
- **HmacSha512** : 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)]
- **HmacSha512WithBase64** : 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)]
- **Md5Byte** : 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)]
- **Md5ByteWithBase64** : 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)]
- **Md5String** : 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)]
- **Md5StringWithBase64** : 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)]
- **Md5File** : return the md5 value of file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/cryptor.md#Md5File)]
- **Sha1** : 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)]
- **Sha1WithBase64** : 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-)]
- **Sha256** : 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)]
- **Sha256WithBase64** : 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)]
- **Sha512** : 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)]
- **Sha512WithBase64** : 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)]
- **GenerateRsaKey** : 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)]
- **RsaEncrypt** : 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)]
- **RsaDecrypt** : 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)]
- **GenerateRsaKeyPair** : 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)]
- **RsaEncryptOAEP** : 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)]
- **RsaDecryptOAEP** : 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)]
- **RsaSign** : 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)]
- **RsaVerifySign** : 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)]
7. Datetime package supports date and time format and compare. index
```go
import "github.com/duke-git/lancet/v2/datetime"
```
#### Function list:
- **AddDay** : 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)]
- **AddHour** : 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)]
- **AddMinute** : 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)]
- **AddWeek** : add or sub week to time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddWeek)]
[[play](https://go.dev/play/p/M9TqdMiaA2p)]
- **AddMonth** : add or sub months to time.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddMonth)]
[[play](https://go.dev/play/p/DLoiOnpLvsN)]
- **AddYear** : 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)]
- **AddDaySafe** : add or sub days to the time and ensure that the returned date does not exceed the valid date of the target year and month.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddDaySafe)]
[[play](https://go.dev/play/p/JTohZFpoDJ3)]
- **AddMonthSafe** : add or sub months to the time and ensure that the returned date does not exceed the valid date of the target year and month.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddMonthSafe)]
[[play](https://go.dev/play/p/KLw0lo6mbVW)]
- **AddYearSafe** : Add or sub years to the time and ensure that the returned date does not exceed the valid date of the target year and month.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#AddYearSafe)]
[[play](https://go.dev/play/p/KVGXWZZ54ZH)]
- **BeginOfMinute** : 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)]
- **BeginOfHour** : 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)]
- **BeginOfDay** : 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)]
- **BeginOfWeek** : 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/DCHdcL6gnfV)]
- **BeginOfMonth** : 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)]
- **BeginOfYear** : 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)]
- **EndOfMinute** : 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)]
- **EndOfHour** : 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)]
- **EndOfDay** : 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)]
- **EndOfWeek** : 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/mGSA162YgX9)]
- **EndOfMonth** : 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)]
- **EndOfYear** : 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)]
- **GetNowDate** : 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)]
- **GetNowTime** : 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)]
- **GetNowDateTime** : 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)]
- **GetTodayStartTime** : 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)]
- **GetTodayEndTime** : 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)]
- **GetZeroHourTimestamp** : 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)]
- **GetNightTimestamp** : 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)]
- **FormatTimeToStr** : 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)]
- **FormatStrToTime** : 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)]
- **NewUnix** : 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)]
- **NewUnixNow** : 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)]
- **NewFormat** : 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)]
- **NewISO8601** : 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)]
- **ToUnix** : 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)]
- **ToFormat** : 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)]
- **ToFormatForTpl** : 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)]
- **ToIso8601** : 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)]
- **IsLeapYear** : 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)]
- **BetweenSeconds** : 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)]
- **DayOfYear** : 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)]
- **IsWeekend** : 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)]
- **NowDateOrTime** : 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)]
- **Timestamp** : returns current second timestamp.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datetime.md#Timestamp)]
- **TimestampMilli** : 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)]
- **TimestampMicro** : 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)]
- **TimestampNano** : 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)]
- **TrackFuncTime** : 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)]
- **DaysBetween** : 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)]
- **GenerateDatetimesBetween** : 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)]
- **Min** : 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)]
- **Max** : 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-)]
- **MaxMin** : 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)]
8. Datastructure package contains some common data structure. eg. list, linklist, stack, queue, set, tree, graph. index
```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:
- **List** : a linear table, implemented with slice.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/list.md)]
- **CopyOnWriteList** : 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)]
- **Link** : 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)]
- **Stack** : 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)]
- **Queue** : 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)]
- **Set** : 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)]
- **Tree** : binary search tree structure.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/tree.md)]
- **Heap** : a binary max heap.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/heap.md)]
- **Hashmap** : hash map structure.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/hashmap.md)]
- **Optional** : Optional container.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/datastructure/optional.md)]
9. EventBus is an event bus used for handling events within an application. Index
```go
import "github.com/duke-git/lancet/v2/eventbus"
```
#### 函数列表:
- **NewEventBus** : Create an EventBus instance.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#NewEventBus)]
[[play](https://go.dev/play/p/gHbOPV_NUOJ)]
- **Subscribe** : subscribes to an event with a specific event topic and listener function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#Subscribe)]
[[play](https://go.dev/play/p/EYGf_8cHei-)]
- **Unsubscribe** : unsubscribes from an event with a specific event topic and listener function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#Unsubscribe)]
[[play](https://go.dev/play/p/Tmh7Ttfvprf)]
- **Publish** : publishes an event with a specific event topic and data payload.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#Publish)]
[[play](https://go.dev/play/p/gHTtVexFSH9)]
- **ClearListeners** : clears all the listeners.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#ClearListeners)]
[[play](https://go.dev/play/p/KBfBYlKPgqD)]
- **ClearListenersByTopic** : clears all the listeners by topic.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#ClearListenersByTopic)]
[[play](https://go.dev/play/p/gvMljmJOZmU)]
- **GetListenersCount** : returns the number of listeners for a specific event topic.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#GetListenersCount)]
[[play](https://go.dev/play/p/8VPJsMQgStM)]
- **GetAllListenersCount** : returns the total number of all listeners.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#GetAllListenersCount)]
[[play](https://go.dev/play/p/PUlr0xcpEOz)]
- **GetEvents** : returns all the events topics.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#GetEvents)]
[[play](https://go.dev/play/p/etgjjcOtAjX)]
- **SetErrorHandler** : sets the error handler function.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/eventbus.md#SetErrorHandler)]
[[play](https://go.dev/play/p/gmB0gnFe5mc)]
9. Fileutil package implements some basic functions for file operations. index
```go
import "github.com/duke-git/lancet/v2/fileutil"
```
#### Function list：
- **ClearFile** : 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)]
- **CreateFile** : 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)]
- **CreateDir** : 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)]
- **CopyFile** : 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)]
- **CopyDir** : 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)]
- **FileMode** : 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)]
- **MiMeType** : 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)]
- **IsExist** : 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)]
- **IsLink** : 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)]
- **IsDir** : 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)]
- **ListFileNames** : 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)]
- **RemoveFile** : 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)]
- **ReadFileToString** : 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)]
- **ReadFileByLine** : 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)]
- **Zip** : 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)]
- **ZipAppendEntry** : 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)]
- **UnZip** : 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)]
- **CurrentPath** : 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)]
- **IsZipFile** : 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)]
- **FileSize** : 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)]
- **MTime** : 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)]
- **Sha** : 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)]
- **ReadCsvFile** : 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)]
- **WriteCsvFile** : write content to target csv file.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#WriteCsvFile)]
- **WriteMapsToCsv** : 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)]
- **WriteBytesToFile** : 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)]
- **WriteStringToFile** : 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)]
- **ReadFile** : read file or url.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/fileutil.md#ReadFile)]
- **ChunkRead** : 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)]
- **ParallelChunkRead** : 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)]
- **GetExeOrDllVersion** : 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)]
10. Formatter contains some functions for data formatting. index
```go
import "github.com/duke-git/lancet/v2/formatter"
```
#### Function list:
- **Comma** : 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)]
- **Pretty** : 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)]
- **PrettyToWriter** : 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)]
- **DecimalBytes** : 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)]
- **BinaryBytes** : 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)]
- **ParseDecimalBytes** : 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)]
- **ParseBinaryBytes** : 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)]
11. Function package can control the flow of function execution and support part of functional programming. index
```go
import "github.com/duke-git/lancet/v2/function"
```
#### Function list:
- **After** : 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)]
- **Before** : 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)]
- **CurryFn** : 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)]
- **Compose** : 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)]
- **Delay** : 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)]
- **Debounceddeprecated** : 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)]
- **Debounce** : 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)]
- **Throttle** : 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)]
- **Schedule** : 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)]
- **Pipeline** : 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)]
- **AcceptIf** : 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)]
- **And** : 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)]
- **Or** : 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)]
- **Negate** : 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)]
- **Nor** : 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)]
- **Nand** : 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)]
- **Xnor** : 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)]
- **Watcher** : 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)]
12. Maputil package includes some functions to manipulate map. index
```go
import "github.com/duke-git/lancet/v2/maputil"
```
#### Function list:
- **MapTo** : 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)]
- **ForEach** : 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)]
- **Filter** : 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)]
- **FilterByKeys** : 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)]
- **FilterByValues** : 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)]
- **OmitBy** : 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)]
- **OmitByKeys** : 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)]
- **OmitByValues** : 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)]
- **Intersect** : 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)]
- **Keys** : 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)]
- **KeysBy** : 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)]
- **Merge** : 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-)]
- **Minus** : 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)]
- **Values** : 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)]
- **ValuesBy** : 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)]
- **MapKeys** : 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)]
- **MapValues** : 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)]
- **Entries** : 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)]
- **FromEntries** : 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)]
- **Transform** : 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)]
- **IsDisjoint** : 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)]
- **HasKey** : 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)]
- **GetOrSet** : 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)]
- **MapToStruct** : 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)]
- **ToSortedSlicesDefault** : 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)]
- **ToSortedSlicesWithComparator** : 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)]
- **NewOrderedMap** : 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)]
- **OrderedMap_Set** : 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)]
- **OrderedMap_Get** : 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)]
- **OrderedMap_Delete** : 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-)]
- **OrderedMap_Clear** : 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)]
- **OrderedMap_Front** : 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)]
- **OrderedMap_Back** : 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)]
- **OrderedMap_Range** : 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)]
- **OrderedMap_Keys** : 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)]
- **OrderedMap_Values** : 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)]
- **OrderedMap_Elements** : 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)]
- **OrderedMap_Len** : 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-)]
- **OrderedMap_Contains** : 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)]
- **OrderedMap_Iter** : 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)]
- **OrderedMap_ReverseIter** : 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)]
- **OrderedMap_SortByKey** : 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)]
- **OrderedMap_MarshalJSON** : 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)]
- **OrderedMap_UnmarshalJSON** : 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)]
- **NewConcurrentMap** : 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)]
- **ConcurrentMap_Set** : 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)]
- **ConcurrentMap_Get** : 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)]
- **ConcurrentMap_GetOrSet** : 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)]
- **ConcurrentMap_Delete** : 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)]
- **ConcurrentMap_GetAndDelete** :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)]
- **ConcurrentMap_Has** : 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)]
- **ConcurrentMap_Range** : 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)]
- **SortByKey** : 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)]
- **GetOrDefault** : 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)]
13. Mathutil package implements some functions for math calculation. index
```go
import "github.com/duke-git/lancet/v2/mathutil"
```
#### Function list:
- **Average** :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)]
- **Exponent** : 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)]
- **Fibonacci** :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)]
- **Factorial** : 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)]
- **Max** : 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)]
- **MaxBy** : 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)]
- **Min** : 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)]
- **MinBy** : 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)]
- **Percent** : 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)]
- **RoundToFloat** : 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)]
- **RoundToString** : 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)]
- **TruncRound** : 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)]
- **CeilToFloat** : 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)]
- **CeilToString** : 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)]
- **FloorToFloat** : 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)]
- **FloorToString** : 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)]
- **Range** : 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)]
- **RangeWithStep** : 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)]
- **AngleToRadian** : 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)]
- **RadianToAngle** : 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)]
- **PointDistance** : 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)]
- **IsPrime** : 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)]
- **GCD** : 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)]
- **LCM** : 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)]
- **Cos** : 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)]
- **Sin** : 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)]
- **Log** : 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)]
- **Sum** : 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)]
- **Abs** : 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)]
- **Div** : 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)]
- **Variance** : 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)]
- **StdDev** : 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)]
- **Permutation** : 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)]
- **Combination** : 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)]
14. Netutil package contains functions to get net information and send http request. index
```go
import "github.com/duke-git/lancet/v2/netutil"
```
#### Function list:
- **ConvertMapToQueryString** : 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)]
- **EncodeUrl** : 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)]
- **GetInternalIp** : 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)]
- **GetIps** : 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)]
- **GetMacAddrs** : 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)]
- **GetPublicIpInfo** : 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)]
- **GetRequestPublicIp** : 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)]
- **IsPublicIP** : 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)]
- **IsInternalIP** : 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)]
- **HttpRequest** : 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)]
- **HttpClient** : 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)]
- **SendRequest** : 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)]
- **DecodeResponse** : 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)]
- **StructToUrlValues** : 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)]
- **HttpGetdeprecated** : send http get request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpGet)]
- **HttpDeletedeprecated** : send http delete request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpDelete)]
- **HttpPostdeprecated** : send http post request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpPost)]
- **HttpPutdeprecated** : send http put request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpPut)]
- **HttpPatchdeprecated** : send http patch request.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#HttpPatch)]
- **ParseHttpResponse** : decode http response into target object.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#ParseHttpResponse)]
- **DownloadFile** : 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)]
- **UploadFile** : upload the file to a server.
[[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/netutil.md#UploadFile)]
- **IsPingConnected** : 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)]
- **IsTelnetConnected** : 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)]
15. Pointer package contains some util functions to operate go pointer. index
```go
import "github.com/duke-git/lancet/v2/pointer"
```
#### Function list:
- **ExtractPointer** : 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)]
- **Of** : 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)]
- **Unwrap** : 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)]
- **UnwrapOr** : 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)]
- **UnwarpOrDefault** : 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)]
16. Random package implements some basic functions to generate random int and string. index
```go
import "github.com/duke-git/lancet/v2/random"
```
#### Function list:
- **RandBytes** : 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)]
- **RandInt** : 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)]
- **RandString** : 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)]
- **RandUpper** : 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)]
- **RandLower** : 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)]
- **RandNumeral** : 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)]
- **RandNumeralOrLetter** : 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)]
- **UUIdV4** : 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)]
- **RandUniqueIntSlice** : 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)]
- **RandSymbolChar** : 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)]
- **RandFloat** : 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)]
- **RandFloats** : 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)]
- **RandStringSlice** : 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)]
- **RandBool** : 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)]
- **RandBoolSlice** : 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)]
- **RandIntSlice** : 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)]
- **RandFromGivenSlice** : 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)]
- **RandSliceFromGivenSlice** : 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)]
- **RandNumberOfLength** : 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)]
17. Retry package is for executing a function repeatedly until it was successful or canceled by the context. index
```go
import "github.com/duke-git/lancet/v2/retry"
```
#### Function list:
- **Context** : 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)]
- **Retry** : 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)]
- **RetryFunc** : 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)]
- **RetryDuration** : 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)]
- **RetryTimes** : 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)]
- **BackoffStrategy** : 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)]
- **RetryWithCustomBackoff** : 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)]
- **RetryWithLinearBackoff** : 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)]
- **RetryWithExponentialWithJitterBackoff** : 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)]
18. Slice contains some functions to manipulate slice. index
```go
import "github.com/duke-git/lancet/v2/slice"
```
#### Function list:
- **AppendIfAbsent** : 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)]
- **Contain** : 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)]
- **ContainBy** : 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)]
- **ContainSubSlice** : 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)]
- **Chunk** : 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)]
- **Compact** : 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)]
- **Concat** : 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)]
- **Count