Run results for: Array.from(Array(length), () => new Array(length)) vs Array.from(new Array(length), () => new Array(length)) vs Array.from({length}, () => new Array(length)) vs for loop push vs for loop index v2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Windows

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
Array.from(new Array(length), () => new Array(length))	154245.3 Ops/sec
Array.from({length}, () => new Array(length))	152616.1 Ops/sec
for push	226480.8 Ops/sec
for index	239932.4 Ops/sec
Array.from(Array(length), () => new Array(length))	151653.0 Ops/sec

Tests:

Array.from(new Array(length), () => new Array(length))
const i = 25; const j = 25; const a = Array.from(new Array(i), () => new Array(j))
Array.from({length}, () => new Array(length))
const i = 25; const j = 25; const a = Array.from({length:i}, () => new Array(j))
for push
const i = 25; const j = 25; const a = [] for (let k = 0; k < i; k++) { a.push(new Array(j)); }
for index
const i = 25; const j = 25; const a = [] for (let k = 0; k < i; k++) { a[k] = new Array(j); }
Array.from(Array(length), () => new Array(length))
const i = 25; const j = 25; const a = Array.from(Array(i), () => new Array(j))
for push set size
const i = 25; const j = 25; const a = [] a.length = i; for (let k = 0; k < i; k++) { a.push(new Array(j)); }
for index set size
const i = 25; const j = 25; const a = [] a.length = i; for (let k = 0; k < i; k++) { a[k] = new Array(j); }