Run results for: for-in using hasOwnProperty

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36

Browser: Chrome 81

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
for-in hasOwnProperty	0.6 Ops/sec
for-in	0.6 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 i=10000; i > 0; i--) {
  for (var key in obj) {
	  if(obj.hasOwnProperty(key))
      	console.log(obj[key]); 
  }
}

 
for (var i=10000; i > 0; i--) {  for (var key in obj) {      if(obj.hasOwnProperty(key))        console.log(obj[key]);   }}

for (var i=10000; i > 0; i--) {
  for (var key in obj) {
    console.log(obj[key]); 
  }
}

 
for (var i=10000; i > 0; i--) {  for (var key in obj) {    console.log(obj[key]);   }}