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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Mobile/15E148 DuckDuckGo/7 Safari/605.1.15

Browser: Mobile Safari 16

Operating system: iOS 16.1.2

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
For In	136.1 Ops/sec
Object values	138.6 Ops/sec
Object keys forEach	111.1 Ops/sec
Object entries forEach	103.0 Ops/sec
object values forEach	114.6 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