Run results for: for vs foreach vs for..in vs for..of

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/123.0.6312.52 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 123

Operating system: iOS 17.4

Device Platform: Mobile

Date tested: 2 years ago

for in

5.9M/s

foreach

571K/s

for..of

136K/s

for

132K/s

View exact numbers

Test name	Executions per second
✓ for in	5,851,168 Ops/sec
foreach	571,175 Ops/sec
for..of	135,748 Ops/sec
for	132,318 Ops/sec

Script Preparation code:

var array = new Array(100);

Tests:

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

Run results for: for vs foreach vs for..in vs for..of

Compare loop performance

for

foreach

for in

for..of