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

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); }

Rendered benchmark preparation results:

Previous results

Test case name	Result
for-in
Object.keys

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Linux

Object.keys

2/s

for-in

2/s

View exact numbers

Test name	Executions per second
✓ Object.keys	2 Ops/sec
✓ for-in	2 Ops/sec

for-in vs object.keys (no hof in Object.keys, hasOwn check) (version: 1)