Run results for: concat() vs spread (...) for combining two arrays

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

spread

4.3M/s

concat()

1.4M/s

View exact numbers

Test name	Executions per second
✓ spread	4,349,516 Ops/sec
concat()	1,392,896 Ops/sec

Tests:

concat()
const a = [1, 2, 3, 4]; const b = [5, 6, 7, 8]; const result = a.concat(b);
spread
const a = [1, 2, 3, 4]; const b = [5, 6, 7, 8]; const result = [...a, ...b];