Run results for: for-in vs object.keys (no hof in Object.keys, hasOwn check)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:132.0) Gecko/20100101 Firefox/132.0

Browser: Firefox 132

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Object.keys

1/s

for-in

1/s

View exact numbers

Test name	Executions per second
✓ Object.keys	1 Ops/sec
for-in	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) { if (!Object.hasOwn(obj, key)) continue; console.log(key); } }
Object.keys
for (var i=10000; i > 0; i--) { for (var key of Object.keys(obj)) console.log(key); }