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javascript loops with setup code
(version: 1)
Comparing performance of:
foreach vs for-in vs for-of vs for vs optimized-for
Created:
9 months ago
by:
Guest
Jump to the latest result
Script Preparation code:
const items = Array.from({length: 1000}, () => Math.floor(Math.random() * 40)); const itemsLength = items.length; let index = 0;
Tests:
foreach
items.forEach(i => index++);
for-in
for (let i in items) { index++; }
for-of
for (let i of items) { index++; }
for
for(let i = 0; i < items.length; ++i) { index++; }
optimized-for
for(let i = itemsLength; i > 0; --i) { index++; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
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Test case name
Result
foreach
for-in
for-of
for
optimized-for
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
9 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15
Browser/OS:
Safari 18 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=613849" width="100%" height="500px"></iframe>
Test name
Executions per second
foreach
667168.3 Ops/sec
for-in
36418.4 Ops/sec
for-of
559807.8 Ops/sec
for
235967.1 Ops/sec
optimized-for
331771.2 Ops/sec
Related benchmarks:
javascript loops
javascript loops small
javascript loops (foreach, for-in, for-of, for, map, reduce) 1000 items
javascript loops with reduce 3
javascript loops with reduce 5
javascript loops (bigger loops)
javascript loops 10000000 items
javascript loops2
javascript loops v2
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