Run results for: Create New Array & Fill it

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.83 Safari/537.36

Browser: Chrome 99

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Map	21.6 Ops/sec
Array.apply + Fill	0.0 Ops/sec
While Loop	16.2 Ops/sec
For Loop	16.2 Ops/sec
New Array + Fill	856.0 Ops/sec
Array Literal With Length + Fill	847.9 Ops/sec

Script Preparation code:

var length = 1000000;
var fillWith = 5;

AخA
 
var length = 1000000;var fillWith = 5;

Tests:

const array = [...Array(length)].map(() => fillWith);

 
const array = [...Array(length)].map(() => fillWith);

Array.apply + Fill
const array = Array.apply([], { length }).fill(fillWith);
const array = Array.apply([], { length }).fill(fillWith);

let index = length - 1;
const array = [];

while (index-- > 0) array[index] = fillWith;

​x
 
let index = length - 1;const array = [];​while (index-- > 0) array[index] = fillWith;

const array = [];

for (let index = length - 1; index >= 0; index--) array[index] = fillWith;

 
const array = [];​for (let index = length - 1; index >= 0; index--) array[index] = fillWith;

New Array + Fill
const array = new Array(length).fill(fillWith);
const array = new Array(length).fill(fillWith);
Array Literal With Length + Fill
const array = []; array.length = length; array.fill(fillWith);
const array = [];
array.length = length;

array.fill(fillWith);