Does it mutate 😱

Array.prototype.entries

No mutation

Description

The entries() method of Array instances returns a new array iterator object that contains the key/value pairs for each index in the array.

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

Example

const array1 = ['a', 'b', 'c'];

const iterator1 = array1.entries();

console.log(iterator1.next().value);
// Expected output: Array [0, "a"]

console.log(iterator1.next().value);
// Expected output: Array [1, "b"]