Benchmark: Battle of the JavaScript Loops

Script Preparation code:

var array = new Array(1000);

Tests:

for
for (var i = 0; i < array.length; i += 1) { array[i]; }
for (with defined iterator)
var i = 0; for (i; i < array.length; i += 1) { array[i]; }
for (with defined iterator and iterator limit)
var i = 0; var arrayLength = array.length; for (i; i < arrayLength; i += 1) { array[i]; }
for of
for (var i of array) { array[i]; }
for in
for (var i in array) { array[i]; }
forEach
array.forEach(function(i) { array[i]; });
do while
var i = 0; do { array[i]; i += 1; } while (i < array.length);
do while (with defined iterator limit)
var i = 0; var arrayLength = array.length; do { array[i]; i += 1; } while (i < arrayLength);
while
var i = 0; while (i < array.length) { array[i]; i += 1; }
while (with defined iterator limit)
var i = 0; var arrayLength = array.length; while (i < arrayLength) { array[i]; i += 1; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
for (with defined iterator)
for (with defined iterator and iterator limit)
for of
for in
forEach
do while
do while (with defined iterator limit)
while
while (with defined iterator limit)

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; rv:135.0) Gecko/20100101 Firefox/135.0

Browser/OS: Firefox 135 on Linux

View result in a separate tab

for in

65.2M/s

for (with defined iterator and iterator limit)

1.1M/s

while

1.1M/s

while (with defined iterator limit)

1.1M/s

for (with defined iterator)

1.1M/s

do while (with defined iterator limit)

1.1M/s

for

1.1M/s

do while

824K/s

forEach

659K/s

for of

146K/s

View exact numbers

Test name	Executions per second
✓ for in	65,245,128 Ops/sec
for (with defined iterator and iterator limit)	1,143,474 Ops/sec
while	1,124,730 Ops/sec
while (with defined iterator limit)	1,098,405 Ops/sec
for (with defined iterator)	1,095,748 Ops/sec
do while (with defined iterator limit)	1,093,442 Ops/sec
for	1,090,847 Ops/sec
do while	824,391 Ops/sec
forEach	658,592 Ops/sec
for of	146,461 Ops/sec

Battle of the JavaScript Loops (version: 1)

Brought to you by boredom

Comparing performance of: `for vs for (with defined iterator) vs for (with defined iterator and iterator limit) vs for of vs for in vs forEach vs do while vs do while (with defined iterator limit) vs while vs while (with defined iterator limit)`

Created: one year ago by: Guest

Go to the latest result

for

for (with defined iterator)

for (with defined iterator and iterator limit)

for of

for in

forEach

do while

do while (with defined iterator limit)

while

while (with defined iterator limit)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Battle of the JavaScript Loops (version: 1)

Brought to you by boredom

Comparing performance of: for vs for (with defined iterator) vs for (with defined iterator and iterator limit) vs for of vs for in vs forEach vs do while vs do while (with defined iterator limit) vs while vs while (with defined iterator limit)

Created: one year ago by: Guest

Go to the latest result

for

for (with defined iterator)

for (with defined iterator and iterator limit)

for of

for in

forEach

do while

do while (with defined iterator limit)

while

while (with defined iterator limit)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `for vs for (with defined iterator) vs for (with defined iterator and iterator limit) vs for of vs for in vs forEach vs do while vs do while (with defined iterator limit) vs while vs while (with defined iterator limit)`