arrays

arrays

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]