Benchmark: for-in with hasOwnProperty checking vs object.keys

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

Rendered benchmark preparation results:

Previous results

Test case name	Result
for-in
Object.keys

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:85.0) Gecko/20100101 Firefox/85.0

Browser/OS: Firefox 85 on Linux

Test name	Executions per second
for-in	100.7 Ops/sec
Object.keys	1.0 Ops/sec

for-in with hasOwnProperty checking vs object.keys (version: 0)