Run results for: Array concat vs array spread

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; SM-N960F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.91 Mobile Safari/537.36

Browser: Chrome Mobile 90

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Concat	0.2 Ops/sec
Spread	4.1 Ops/sec

Tests:

Concat
let target = new Array(25).fill(0); const items = new Array(25).fill(0); for(let i=0; i<10000; ++i){ target = target.concat(items); }
Spread
let target = new Array(25).fill(0); const items = new Array(25).fill(0); for(let i=0; i<10000; ++i){ target = {...target, ...items}; }