Run results for: For in vs Object.keys.forEach FixedForYaRetard

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
For In	848.7 Ops/sec
Object keys forEach	879.8 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 })

AخA
 
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:

var sum = 0
for (var key in obj) {
  sum++
}

 
var sum = 0for (var key in obj) {  sum++}

Object keys forEach
var sum = 0 Object.keys(obj).forEach(val => { sum++ })
var sum = 0
Object.keys(obj).forEach(val => { sum++ })