Examples of slicing, copying, appending, and prepending arrays.

Node.js

const array = [1, 2, 3, 4, 5];
console.log(array);

const clone = array.slice(0);
console.log(clone);

const sub = array.slice(2, 4);
console.log(sub);

const concatenated = clone.concat([6, 7]);
console.log(concatenated);

const prepended = [-2, -1, 0].concat(concatenated);
console.log(prepended);

Output

[ 1, 2, 3, 4, 5 ]
[ 1, 2, 3, 4, 5 ]
[ 3, 4 ]
[ 1, 2, 3, 4, 5, 6, 7 ]
[ -2, -1, 0, 1, 2, 3, 4, 5, 6, 7 ]

Go

package main

import "fmt"

func main() {
	array := []int{1, 2, 3, 4, 5}
	fmt.Println(array)

	clone := make([]int, len(array))
	copy(clone, array)
	fmt.Println(clone)

	sub := array[2:4]
	fmt.Println(sub)

	concatenated := append(array, []int{6, 7}...)
	fmt.Println(concatenated)

	prepended := append([]int{-2, -1, 0}, concatenated...)
	fmt.Println(prepended)
}

Output

[1 2 3 4 5]
[1 2 3 4 5]
[3 4]
[1 2 3 4 5 6 7]
[-2 -1 0 1 2 3 4 5 6 7]