Run results for: Array push vs Spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Mac OS X 10.15.2

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
A: push	45390.1 Ops/sec
B: Spread	979.7 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 ]);