Run results for: Battle of the JavaScript Loops

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
✓ for in	1,208,958 Ops/sec
forEach	1,154,055 Ops/sec
for (with defined iterator and iterator limit)	12,944 Ops/sec
while (with defined iterator limit)	12,895 Ops/sec
do while (with defined iterator limit)	12,749 Ops/sec
for of	11,749 Ops/sec
for (with defined iterator)	6,534 Ops/sec
for	6,509 Ops/sec
do while	6,452 Ops/sec
while	6,377 Ops/sec

Test name

Executions per second

✓ for in

1,208,958 Ops/sec

forEach

1,154,055 Ops/sec

for (with defined iterator and iterator limit)

12,944 Ops/sec

while (with defined iterator limit)

12,895 Ops/sec

do while (with defined iterator limit)

12,749 Ops/sec

for of

11,749 Ops/sec

for (with defined iterator)

6,534 Ops/sec

for

6,509 Ops/sec

do while

6,452 Ops/sec

while

6,377 Ops/sec

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; }