Benchmark: for vs foreach vs for..in vs for..of (let instead of var, and optimized for)

Script Preparation code:

const array = new Array(100);

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0

Browser/OS: Firefox 151 on Windows

View result in a separate tab

for in

27.8M/s

for

8.3M/s

foreach

4.9M/s

for..of

606K/s

View exact numbers

Test name	Executions per second
✓ for in	27,781,294 Ops/sec
for	8,274,394 Ops/sec
foreach	4,880,242 Ops/sec
for..of	606,258 Ops/sec

for vs foreach vs for..in vs for..of (let instead of var, and optimized for) (version: 1)

Compare loop performance

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

Created: one year ago by: Guest

Go to the latest result

for

foreach

for in

for..of

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

for vs foreach vs for..in vs for..of (let instead of var, and optimized for) (version: 1)

Compare loop performance

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

Created: one year ago by: Guest

Go to the latest result

for

foreach

for in

for..of

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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