Run results for: For in vs Object.*.forEach vs Object.values

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 YaBrowser/23.7.0.2610 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 23

Operating system: Mac OS X 10.14.3

Device Platform: Desktop

Date tested: 2 years ago

object values forEach

6/s

Object keys forEach

5/s

For In

5/s

Object values

5/s

Object entries forEach

4/s

View exact numbers

Test name	Executions per second
✓ object values forEach	6 Ops/sec
Object keys forEach	5 Ops/sec
For In	5 Ops/sec
Object values	5 Ops/sec
Object entries forEach	4 Ops/sec

Script Preparation code:

var obj = new Object()
var keys = (new Array(10000)).fill(0).map((x, i) => { return i + 1 })
keys.forEach((x) => { obj['prop' + x] = x })

Tests:

For In
for (var key in obj) { console.log(obj[key]); }
Object values
for(let value of Object.values(obj)){ console.log(value); }
Object keys forEach
Object.keys(obj).forEach(key => console.log(obj[key]));
Object entries forEach
Object.entries(obj).forEach(([key, value]) => console.log(key,'->',value));
object values forEach
Object.values(obj).forEach(value => console.log(value));