Run results for: for vs foreach vs some

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:58.0) Gecko/20100101 Firefox/58.0

Browser: Firefox 58

Operating system: Mac OS X 10.13

Device Platform: Other

Date tested: 2025 years ago

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 }