Run results for: for vs foreach vs for..of vs for..of over entries

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3 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 17.3

Device Platform: Mobile

Date tested: 2 years ago

for..of

230K/s

foreach

228K/s

for..of over entries

162K/s

for

79K/s

View exact numbers

Test name	Executions per second
✓ for..of	230,458 Ops/sec
foreach	228,059 Ops/sec
for..of over entries	162,377 Ops/sec
for	78,760 Ops/sec

Script Preparation code:

var array = Array.from({length: 100});
var t;

Tests:

for
for (let i = 0; i < array.length; i++) { t = array[i]; }
foreach
array.forEach(function(v, i) { t = v; });
for..of
for (var v of array) { t = v; }
for..of over entries
for (var [i, v] of array.entries()) { t = v; }

Run results for: for vs foreach vs for..of vs for..of over entries

Compare loop performance

for

foreach

for..of

for..of over entries