Run results for: for-in vs for object.keys keys

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36

Browser: Chrome 96

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for-in	32170.3 Ops/sec
Object.keys	32566.2 Ops/sec

Script Preparation code:

var obj = {
  'a': 1,
  'b': 1,
  'c': 1,
  'd': 1,
  'e': 1,
  'f': 1,
  'g': 1
};

AخA
 
var obj = {  'a': 1,  'b': 1,  'c': 1,  'd': 1,  'e': 1,  'f': 1,  'g': 1};

Tests:

  for (var key in obj) {
      console.log(key); 
  }

​x
 
​  for (var key in obj) {      console.log(key);   }​

 const keys =  Object.keys(obj)
  for(let i= 0; i< keys.length; i++){
     console.log(keys[i])
  }

 
​ const keys =  Object.keys(obj)  for(let i= 0; i< keys.length; i++){     console.log(keys[i])  }​