Run results for: Array.prototype.concat vs spread operator on small batches

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
✓ Array.prototype.concat - few iterations	91,792 Ops/sec
Spread operator - few iterations	38,633 Ops/sec
Array.prototype.concat - many iterations	1,770 Ops/sec
Spread operator - many iterations	459 Ops/sec

Tests:

Array.prototype.concat - few iterations
const obj = { a: 'string', b: 99 }; const a = Array(50).fill(obj); let b = []; for (let i = 0; i < 20; i++) { b = b.concat(a); }
Spread operator - few iterations
const obj = { a: 'string', b: 99 }; const a = Array(50).fill(obj); let b = []; for (let i = 0; i < 20; i++) { b = [...b, ...a]; }
Array.prototype.concat - many iterations
const obj = { a: 'string', b: 99 }; const a = Array(50).fill(obj); let b = []; for (let i = 0; i < 200; i++) { b = b.concat(a); }
Spread operator - many iterations
const obj = { a: 'string', b: 99 }; const a = Array(50).fill(obj); let b = []; for (let i = 0; i < 200; i++) { b = [...b, ...a]; }