Run results for: Object.keys vs for in vs Object.getOwnPropertyNames

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Browser: Chrome 74

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

var obj = {
  $props : ['a','b','c'],
  a:1,
  b:2,
  c:3
}

Tests:

asta castiga btw
let n = 0; for (let k in obj) { n++; }
meh
const arr = Object.keys(obj); let n = 0; for (let i = 0; i < arr.length; i++) { n++; }
meh 2
const arr = Object.getOwnPropertyNames(obj); let n = 0; for (let i = 0; i < arr.length; i++) { n++; }