Benchmark: For in vs Object.*.forEach vs Object.values vs Object.entries in for loop

Script Preparation code:

var obj = new Object()
var keys = (new Array(10000)).fill(0).map((x, i) => { return i + 1 })
keys.forEach((x) => { obj['prop' + x] = x })

Tests:

For In
for (var key in obj) { console.log(obj[key]); }
Object values
for(let value of Object.values(obj)){ console.log(value); }
Object keys forEach
Object.keys(obj).forEach(key => console.log(obj[key]));
Object entries forEach
Object.entries(obj).forEach(([key, value]) => console.log(key,'->',value));
object values forEach
Object.values(obj).forEach(value => console.log(value));
Object entries plus for loop
let entries = Object.entries(obj) let length = entries.length for(let i = 0; i < length; i++){ console.log(entries[i][1]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For In
Object values
Object keys forEach
Object entries forEach
object values forEach
Object entries plus for loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Mobile/15E148 Safari/604.1 Ddg/26.5

Browser/OS: Mobile Safari 26 on iOS 18.6

View result in a separate tab

For In

255/s

Object values

240/s

Object entries plus for loop

202/s

object values forEach

182/s

Object keys forEach

179/s

Object entries forEach

167/s

View exact numbers

Test name	Executions per second
✓ For In	255 Ops/sec
Object values	240 Ops/sec
Object entries plus for loop	202 Ops/sec
object values forEach	182 Ops/sec
Object keys forEach	179 Ops/sec
Object entries forEach	167 Ops/sec

For in vs Object.*.forEach vs Object.values vs Object.entries in for loop (version: 0)

Comparing performance of: `For In vs Object values vs Object keys forEach vs Object entries forEach vs object values forEach vs Object entries plus for loop`

Created: 2 years ago by: Guest

Go to the latest result

For In

Object values

Object keys forEach

Object entries forEach

object values forEach

Object entries plus for loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

For in vs Object.*.forEach vs Object.values vs Object.entries in for loop (version: 0)

Comparing performance of: For In vs Object values vs Object keys forEach vs Object entries forEach vs object values forEach vs Object entries plus for loop

Created: 2 years ago by: Guest

Go to the latest result

For In

Object values

Object keys forEach

Object entries forEach

object values forEach

Object entries plus for loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `For In vs Object values vs Object keys forEach vs Object entries forEach vs object values forEach vs Object entries plus for loop`