map()

ES5+

Creates a new array with the results of calling a provided function on every element in the calling array.

Syntax

array.map(callback(element, index, array), thisArg)

callback Function

Function that produces an element of the new Array

thisArg any optional

Value to use as this when executing callback

Array

A new array with each element being the result of the callback function

JavaScript

const numbers = [1, 2, 3, 4];
const doubled = numbers.map(x => x * 2);
console.log(doubled);

Output:

// [2, 4, 6, 8]