Run results for: for w/length constant vs foreach vs some vs for..of (2)

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 120

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

some

2.6M/s

foreach with operation

2.6M/s

for (lenght 另外儲存)

100K/s

for..of

80K/s

for (lenght 不另外儲存)

50K/s

View exact numbers

Script Preparation code:

var array = new Array(100);

Tests:

for (lenght 另外儲存)
const length = array.length for (var i = 0; i < length; i++) { array[i]; }
foreach with operation
array.forEach(function(i) { array[i]; });
some
array.some(function(i) { array[i]; });
for..of
for (var i of array) { array[i]; }
for (lenght 不另外儲存)
for (var i = 0; i < array.length; i++) { array[i]; }