Run results for: Create New Array & Fill it

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.0 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Map	9.7 Ops/sec
Array.apply + Fill	0.0 Ops/sec
While Loop	2.7 Ops/sec
For Loop	2.7 Ops/sec
New Array + Fill	385.0 Ops/sec
Array Literal With Length + Fill	115.4 Ops/sec

Script Preparation code:

var length = 1000000;
var fillWith = 5;

Tests:

Map
const array = [...Array(length)].map(() => fillWith);
Array.apply + Fill
const array = Array.apply([], { length }).fill(fillWith);
While Loop
let index = length - 1; const array = []; while (index-- > 0) array[index] = fillWith;
For Loop
const array = []; for (let index = length - 1; index >= 0; index--) array[index] = fillWith;
New Array + Fill
const array = new Array(length).fill(fillWith);
Array Literal With Length + Fill
const array = []; array.length = length; array.fill(fillWith);