Benchmark: for vs for-of vs forEach

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var objects = new Array(100_000).fill(0).map(()=>({}));

Tests:

for
for (var i = 0; i < objects.length; ++i) { objects[i].value = 'a'; }
for-of
for(const o of objects) { o.value = 'a' }
forEach
objects.forEach(o => { o.value = 'a'; })

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 13 runs

for-of

10K/s

forEach

9K/s

for

4K/s

Fastest: for-of (2.4x faster)

View exact numbers

✓ for-of: 10,396 ops/sec
• forEach: 8,627 ops/sec
• for: 4,351 ops/sec

Firefox 6 runs

for

7K/s

for-of

4K/s

forEach

4K/s

Fastest: for (2.0x faster)

View exact numbers

✓ for: 7,139 ops/sec
• for-of: 3,962 ops/sec
• forEach: 3,659 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
for-of
forEach

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 21 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

forEach

9K/s

for-of

6K/s

for

4K/s

View exact numbers

Test name	Executions per second
✓ forEach	8,697 Ops/sec
for-of	6,264 Ops/sec
for	3,587 Ops/sec

for vs for-of vs forEach (version: 1)

Test speed of iterating over an array

Comparing performance of: `for vs for-of vs forEach`

Created: 10 months ago by: Guest

Go to the latest result

for

for-of

forEach

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 13 runs

Firefox 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

for vs for-of vs forEach (version: 1)

Test speed of iterating over an array

Comparing performance of: for vs for-of vs forEach

Created: 10 months ago by: Guest

Go to the latest result

for

for-of

forEach

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 13 runs

Firefox 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `for vs for-of vs forEach`