Run results for: Create New Array & Fill it

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36 OPR/80.0.4170.61

Browser: Opera 80

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Map	8.8 Ops/sec
Array.apply + Fill	0.0 Ops/sec
While Loop	6.8 Ops/sec
For Loop	6.8 Ops/sec
New Array + Fill	323.0 Ops/sec
Array Literal With Length + Fill	323.4 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);