Benchmark: for-in Object.hasOwn vs for-of Object.keys

Script Preparation code:

var obj = {
  a: 1,
  b: 1,
  c: 1,
  d: 1,
  e: 1,
  f: 1,
  g: 1,
  h: 1,
  i: 1,
  j: 1,
  k: 1,
  l: 1,
  m: 1,
  n: 1,
  o: 1,
  p: 1,
  q: 1,
  r: 1,
  s: 1,
  t: 1,
  u: 1,
  v: 1,
  w: 1,
  x: 1,
  y: 1,
  z: 1
};

Tests:

for-in Object.hasOwn
for (let i = 10000; i > 0; i--) { for (const key in obj) { if (!Object.hasOwn(obj, key)) { continue } console.log(key); } }
for-of Object.keys
for (let i = 10000; i > 0; i--) { for (const key of Object.keys(obj)) { console.log(key) } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for-in Object.hasOwn
for-of Object.keys

Fastest: N/A

Slowest: N/A

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

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/113.0

Browser/OS: Firefox 113 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
for-in Object.hasOwn	0.6 Ops/sec
for-of Object.keys	0.6 Ops/sec

for-in Object.hasOwn vs for-of Object.keys (version: 0)

Comparing performance of: for-in Object.hasOwn vs for-of Object.keys

Created: one year ago by: Guest

Jump to the latest result

for-in Object.hasOwn

for-of Object.keys

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A