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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/127.0.6533.107 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 127

Operating system: iOS 17.6

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

for..in

8.8M/s

foreach

78K/s

some

76K/s

for

24K/s

for..of

24K/s

View exact numbers

Test name	Executions per second
✓ for..in	8,806,349 Ops/sec
foreach	77,999 Ops/sec
some	76,421 Ops/sec
for	24,144 Ops/sec
for..of	24,050 Ops/sec

Script Preparation code:

var array = new Array(1000);

Tests:

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

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

Compare loop performance

for

foreach

some

for..of

for..in