Benchmark: for-in vs object.keys + for

Script Preparation code:

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

Tests:

for-in
const result = []; for (var key in obj) { result.push(key, obj[key]); }
Object.keys
const result = []; const keys = Object.keys(obj); for (let i = 0; i < keys.length; i++) { const key = keys[i]; result.push(key, obj[key]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for-in
Object.keys

Fastest: N/A

Slowest: N/A

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Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.86 YaBrowser/20.8.0.893 Yowser/2.5 Safari/537.36

Browser/OS: Yandex Browser 20 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
for-in	1109500.0 Ops/sec
Object.keys	914853.4 Ops/sec

for-in vs object.keys + for (version: 0)

Comparing performance of: for-in vs Object.keys

Created: 3 years ago by: Guest

Jump to the latest result

for-in

Object.keys

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A