Run results for: for-in vs object.keys without stuff

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36

Browser: Chrome 89

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
for-in	1.4 Ops/sec
Object.keys	0.9 Ops/sec

Script Preparation code:

var obj = {
  'a': 1,
  'b': 2,
  'c': 3,
  'd': 4,
  'e': 5,
  'f': 6,
  'g': 7
};

AخA
 
var obj = {  'a': 1,  'b': 2,  'c': 3,  'd': 4,  'e': 5,  'f': 6,  'g': 7};

Tests:

for (let i = 0; i < 10000; ++i) {
  for (const key in obj) {
      console.log(key); 
  }
}

 
for (let i = 0; i < 10000; ++i) {  for (const key in obj) {      console.log(key);   }}

for (let i = 0; i < 10000; ++i) {
  for (const key of Object.keys(obj)) {
    console.log(key);
  }
}

 
for (let i = 0; i < 10000; ++i) {  for (const key of Object.keys(obj)) {    console.log(key);  }}