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/17.4 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
Array.prototype.concat - few iterations	125065.8 Ops/sec
Spread operator - few iterations	43610.0 Ops/sec
Array.prototype.concat - many iterations	1794.2 Ops/sec
Spread operator - many iterations	429.4 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]; }