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for vs foreach vs for..in vs for..of - add object property
(version: 1)
Compare loop performance
Comparing performance of:
for vs foreach vs for in vs for..of
Created:
4 months ago
by:
Guest
Go to the latest result
Script Preparation code:
const objects = Array.from({ length: 1000 }, () => ({}));
Tests:
for
for (let i = 0, len = objects.length; i < len; i++) { objects[i].prop = 'erty'; }
foreach
objects.forEach(function(i) { i.prop = 'erty'; });
for in
for (let i in objects) { objects[i].prop = 'erty'; }
for..of
for (let i of objects) { i.prop = 'erty'; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
for
foreach
for in
for..of
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
3 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.4 Safari/605.1.15
Browser/OS:
Safari 26 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=627680" width="100%" height="500px"></iframe>
for
40K/s
for..of
39K/s
foreach
23K/s
for in
12K/s
View exact numbers
Test name
Executions per second
✓
for
40,373 Ops/sec
for..of
38,637 Ops/sec
foreach
22,579 Ops/sec
for in
12,258 Ops/sec
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Performance of JavaScript .forEach vs for in
Performance of JavaScript .forEach vs for in 3
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