Given an array of integers, return a new array with each value doubled.

TypeScript

function maps(x: number[]): number[] {
    return x.map(y => y * 2);
}

console.log(maps([1,2]);

Go

package main

import "fmt"

func maps(x []int) []int {
	for i, v := range x {
		x[i] = v * 2
	}
	return x
}

func main() {
	var arr []int = []int{1, 2}
	fmt.Println(maps(arr))
}

Python

def maps(x):
    return list(map(lambda y: y * 2, x))


print(maps([1,2]))

PHP

function maps($x) {
    return array_map(function($y) {
        return $y * 2;
    }, $x);
}

echo maps([1,2]);