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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/120.0.6099.119 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 120

Operating system: iOS 17.2

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
For In	19.1 Ops/sec
Object values	20.6 Ops/sec
Object keys forEach	2.9 Ops/sec
Object entries forEach	2.0 Ops/sec
object values forEach	2.6 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));

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

For In

Object values

Object keys forEach

Object entries forEach

object values forEach