All Slice Method You Need Learn !

Slice.go

package main

import (
	"fmt"
	"log"
	"sort"
)

type Array interface {
	// use for sort Package
	Len() int
	Swap(i, j int)
	Less(i, j int) bool

	Pop() int
	Copy() Slice
	Revers()
	Append(val int)
	Index(val int) int
	Remove(target int) int
}

type Slice []int

func (a Slice) Len() int           { return len(a) }
func (a Slice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a Slice) Less(i, j int) bool { return a[i] < a[j] }

func (arr *Slice) Pop() int {
	if len(*arr) == 0 {
		panic("array length equal zero!")
	}

	popVal := (*arr)[len(*arr)-1]
	*arr = (*arr)[:len(*arr)-1]
	return popVal
}

func (arr *Slice) Copy() Slice {
	aCopy := make(Slice, len(*arr))
	copy(aCopy, *arr)
	return aCopy
}

func (arr Slice) Revers() {
	for i, j := 0, len(arr)-1; i < j; i, j = i+1, j-1 {
		arr[i], arr[j] = arr[j], arr[i]
	}
}

func (arr *Slice) Append(val int) {
	*arr = append(*arr, val)
}

func (arr *Slice) Index(target int) int {
	for i, v := range *arr {
		if v == target {
			return i
		}
	}
	return -1
}

func (arr *Slice) Remove(target int) int {
	index := -1
	for i, v := range *arr {
		if v == target {
			index = i
			break
		}
	}

	if index == -1 {
		log.Panicf("Not found value ! Value: %d", target)
	}

	*arr = append((*arr)[:index], (*arr)[index+1:]...)
	return index
}

func main() {
	var arr Array = &Slice{3, 2, 1, 5, 2}

	// sort array with method
	// Len, Swap, Less
	sort.Sort(arr)

	// pop last value
	// output 5
	fmt.Println(arr.Pop())

	// make a copy from main array
	_ = arr.Copy()

	// revers array
	arr.Revers()

	// append new Value
	arr.Append(2)

	// find index of value
	fmt.Println(arr.Index(100))

	// remove one value
	// return index
	fmt.Println(arr.Remove(1))
}