Benchmark: javascript loops with setup code

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>

Previous results

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: one year 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

View result in a separate tab

foreach

667K/s

for-of

560K/s

optimized-for

332K/s

for

236K/s

for-in

36K/s

View exact numbers

Test name	Executions per second
✓ foreach	667,168 Ops/sec
for-of	559,808 Ops/sec
optimized-for	331,771 Ops/sec
for	235,967 Ops/sec
for-in	36,418 Ops/sec

javascript loops with setup code (version: 1)

Comparing performance of: `foreach vs for-in vs for-of vs for vs optimized-for`

Created: one year ago by: Guest

Go to the latest result

foreach

for-in

for-of

for

optimized-for

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

javascript loops with setup code (version: 1)

Comparing performance of: foreach vs for-in vs for-of vs for vs optimized-for

Created: one year ago by: Guest

Go to the latest result

foreach

for-in

for-of

for

optimized-for

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `foreach vs for-in vs for-of vs for vs optimized-for`