Run results for: Array push vs Spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

A: push

120K/s

B: Spread

3K/s

View exact numbers

Test name	Executions per second
✓ A: push	119,916 Ops/sec
B: Spread	3,000 Ops/sec

Script Preparation code:

var list = Array.from({ length: 1000 }).map((_, i) => `Item ${i + 1}`);

Tests:

A: push
var newList = []; list.forEach(item => newList.push(item));
B: Spread
var newList = []; list.forEach(item => newList = [ ...newList, item ]);