Run results for: .unshift() vs .push() + .reverse()23456

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

.push() + reverse()

15.5M/s

.unshift()

1.8M/s

View exact numbers

Test name	Executions per second
✓ .push() + reverse()	15,548,916 Ops/sec
.unshift()	1,791,102 Ops/sec

Script Preparation code:

window.ELE_PER_CYCLE = 12;

Tests:

.unshift()
const reps = window.ELE_PER_CYCLE; const arr = []; for (let i = 0; i < reps; ++i) { arr.unshift(i); }
.push() + reverse()
const reps = window.ELE_PER_CYCLE; const arr = []; for (let i = 0; i < reps; ++i) { arr.push(i); } arr.reverse();