Run results for: 3 different for loops vs foreach() vs some() (fixed)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Linux

Device Platform: Desktop

Date tested: 11 months ago

backward for

822K/s

for (static length)

776K/s

for (dynamic length)

762K/s

foreach

135K/s

some

132K/s

View exact numbers

Script Preparation code:

var array = [];
var i = 0;
for (; i < 1000; ++i) {
 	array[i] = 1;
}

Tests:

for (dynamic length)
var i = 0; for (; i < array.length; ++i) { array[i] = 1 - array[i]; }
foreach
array.forEach(function(num, i) { array[i] = 1 - num; });
some
array.some(function(num, i) { array[i] = 1 - num; });
for (static length)
var len = array.length var i = 0; for (; i < len; ++i) { array[i] = 1 - array[i]; }
backward for
var i = array.length - 1 for (; i >= 0; --i) { array[i] = 1 - array[i]; }