Does it mutate 😱

Array.prototype.map

No mutation

Description

The map() method of Array instances creates a new array populated with the results of calling a provided function on every element in the calling array.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

Example

const array1 = [1, 4, 9, 16];

// Pass a function to map
const map1 = array1.map((x) => x * 2);

console.log(map1);
// Expected output: Array [2, 8, 18, 32]