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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.1.2

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
for-in	2369.2 Ops/sec
Object.keys	951.4 Ops/sec

Script Preparation code:

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

Tests:

for-in
const arr = []; for (var i=10000; i > 0; i--) { for (var key in obj) { arr.push(key); } }
Object.keys
for (var i=10000; i > 0; i--) { Object.keys(obj).map(key => key); }

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

for-in

Object.keys