Run results for: for vs foreach vs some

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser: Firefox 140

Operating system: Linux

Device Platform: Desktop

Date tested: 8 months ago

Benchmark engine: Benchmark.js

some

992.3M/s

while

29.6M/s

for

16.4M/s

for with predefined size

16.0M/s

foreach

9.4M/s

for..in

437K/s

View exact numbers

Script Preparation code:

var array = new Array(100);
for(var i = 0; i < array.length; i++) {
	array[i] = Math.random();
}

Tests:

for..in
for (var i in array) { array[i]; }
foreach
array.forEach(function(item, index) { return item; });
some
array.some(function(item, index) { return item === array[index]; });
for
for (var i = 0; i < array.length; i++) { array[i]; }
for with predefined size
var size = array.length for (var i = 0; i < size; i++) { array[i]; }
while
while((a=array.pop()) !== undefined){ //do your stuff }