Run results for: Concat vs ForEach

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Concat

185K/s

ForEach

2K/s

View exact numbers

Test name	Executions per second
✓ Concat	185,400 Ops/sec
ForEach	1,761 Ops/sec

Script Preparation code:

var selected = [];
var unselected = [];


for (var i = 0; i < 10000; i++) { selected.push(i+'selected') }
for (var j = 0; j < 10000; j++) { unselected.push(i+'unselected') }

Tests:

Concat
var concat = selected.concat(unselected)
ForEach
var concat = []; unselected.forEach((item) => { selected.push(item) });