Run results for: Various Array constructors vs literal performance (10_000 items)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
✓ Array literal (explicit length) - 10 items	47,469 Ops/sec
Array constructor - 10_000 items	46,418 Ops/sec
Array constructor, no new - 10_000 items	45,154 Ops/sec
Array constructor fill - 10_000 items	27,692 Ops/sec
Array literal - 10_000 items	24,748 Ops/sec
Array literal (assign by index) - 10_000 items	23,657 Ops/sec
Frozen Array constructor - 10_000 items	230 Ops/sec

Tests:

Array constructor - 10_000 items
const n = 10_000; const arr = new Array(n); for (let i = 0; i < n; i++) { arr[i] = i; }
Array literal - 10_000 items
const n = 10_000; const arr = []; for (let i = 0; i < n; i++) { arr.push(i); }
Array literal (assign by index) - 10_000 items
const n = 10_000; const arr = []; for (let i = 0; i < n; i++) { arr[i] = i; }
Array literal (explicit length) - 10 items
const n = 10_000; const arr = []; arr.length = n; for (let i = 0; i < n; i++) { arr[i] = i; }
Frozen Array constructor - 10_000 items
const n = 10_000 const arr = new Array(n) Object.freeze(arr) for (let i = 0; i < n; i++) { arr[i] = i }
Array constructor, no new - 10_000 items
const n = 10_000; const arr = Array(n); for (let i = 0; i < n; i++) { arr[i] = i; }
Array constructor fill - 10_000 items
const n = 10_000; const arr = Array(n).fill(undefined); for (let i = 0; i < n; i++) { arr[i] = i; }