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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 12_6_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36

Browser: Chrome 89

Operating system: Mac OS X 12.6.0

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for-in	1.2 Ops/sec
Object.keys	1.1 Ops/sec

Script Preparation code:

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

Tests:

for-in
for (var i=10000; i > 0; i--) { for (var key in obj) { console.log(key); } }
Object.keys
for (var i=10000; i > 0; i--) { for (var key of Object.keys(obj)) { console.log(key); } }