Run results for: compare the ways to generate a random array for iteration + while

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

Test name	Executions per second
[...Array(n)]	9981.4 Ops/sec
Array(n).fill(null)	9944.4 Ops/sec
Array.from({ length: n })	7529.2 Ops/sec
Array.from({ length:n }, (item, i) => i)	7080.2 Ops/sec
while(up--) myArray.push(Math.random());	9672.4 Ops/sec

Tests:

[...Array(n)]
[...Array(1000)].map(() => Math.random());
Array(n).fill(null)
Array(1000).fill(null).map(() => Math.random());
Array.from({ length: n })
Array.from({ length: 1000 }).map(() => Math.random());
Array.from({ length:n }, (item, i) => i)
Array.from({ length:1000 }, () => Math.random());
while(up--) myArray.push(Math.random());
let myArray = []; let up = 1000; while(up--) myArray.push(Math.random());