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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Mobile/15E148 Safari/604.1 Ddg/26.5

Browser: Mobile Safari 26

Operating system: iOS 18.6

Device Platform: Mobile

Date tested: 2 months ago

For In

255/s

Object values

240/s

Object entries plus for loop

202/s

object values forEach

182/s

Object keys forEach

179/s

Object entries forEach

167/s

View exact numbers

Test name	Executions per second
✓ For In	255 Ops/sec
Object values	240 Ops/sec
Object entries plus for loop	202 Ops/sec
object values forEach	182 Ops/sec
Object keys forEach	179 Ops/sec
Object entries forEach	167 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));
Object entries plus for loop
let entries = Object.entries(obj) let length = entries.length for(let i = 0; i < length; i++){ console.log(entries[i][1]); }