Benchmark: for vs foreach vs for..in vs for..of vs reverse while (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]; }
while (reverse)
let i = array.length while(i--){ array[i]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
for in
for..of
while (reverse)

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/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser/OS: Chrome 139 on Mac OS X 10.15.7

View result in a separate tab

foreach

13.8M/s

for in

13.7M/s

for

12.2M/s

while (reverse)

10.5M/s

for..of

2.0M/s

View exact numbers

Test name	Executions per second
✓ foreach	13,811,698 Ops/sec
for in	13,719,504 Ops/sec
for	12,199,214 Ops/sec
while (reverse)	10,542,825 Ops/sec
for..of	1,969,545 Ops/sec

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

Compare loop performance

Comparing performance of: `for vs foreach vs for in vs for..of vs while (reverse)`

Created: one year ago by: Guest

Go to the latest result

for

foreach

for in

for..of

while (reverse)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Compare loop performance

Comparing performance of: for vs foreach vs for in vs for..of vs while (reverse)

Created: one year ago by: Guest

Go to the latest result

for

foreach

for in

for..of

while (reverse)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `for vs foreach vs for in vs for..of vs while (reverse)`