Benchmark: for vs forEach vs some vs for..of vs for..in

Script Preparation code:

var array = new Array(1000).fill(0);

Tests:

for
for (let i = 0, length = array.length; i < length; i++) { array[i] }
foreach
array.forEach(item => item);
some
array.some(item => item);
for..of
for (let item of array) { item }
for..in
for (let i in array) { array[i] }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
for..of
for..in

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Linux

View result in a separate tab

for..of

3.7M/s

foreach

3.7M/s

some

1.8M/s

for

966K/s

for..in

61K/s

View exact numbers

Test name	Executions per second
✓ for..of	3,725,722 Ops/sec
foreach	3,683,489 Ops/sec
some	1,826,720 Ops/sec
for	965,847 Ops/sec
for..in	60,997 Ops/sec

for vs forEach vs some vs for..of vs for..in (version: 1) Benchmark.js

Compare loop performance

Comparing performance of: `for vs foreach vs some vs for..of vs for..in`

Created: 6 years ago by: Registered User

Go to the latest result

for

foreach

some

for..of

for..in

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

for vs forEach vs some vs for..of vs for..in (version: 1) Benchmark.js

Compare loop performance

Comparing performance of: for vs foreach vs some vs for..of vs for..in

Created: 6 years ago by: Registered User

Go to the latest result

for

foreach

some

for..of

for..in

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `for vs foreach vs some vs for..of vs for..in`