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

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));
for of Object.entries
for(let [key,value] of Object.entries(obj)){ console.log(value); }

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
for of Object.entries

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

object values forEach

74/s

Object keys forEach

73/s

For In

71/s

Object values

70/s

for of Object.entries

65/s

Object entries forEach

55/s

View exact numbers

Test name	Executions per second
✓ object values forEach	74 Ops/sec
Object keys forEach	73 Ops/sec
For In	71 Ops/sec
Object values	70 Ops/sec
for of Object.entries	65 Ops/sec
Object entries forEach	55 Ops/sec

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

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

Created: 3 years ago by: Guest

Go to the latest result

For In

Object values

Object keys forEach

Object entries forEach

object values forEach

for of Object.entries

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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

Created: 3 years ago by: Guest

Go to the latest result

For In

Object values

Object keys forEach

Object entries forEach

object values forEach

for of Object.entries

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 for of Object.entries`