Run results for: for vs foreach vs some

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/93.0.4577.39 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 93

Operating system: iOS 14.7

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
for..in	67679.8 Ops/sec
foreach	3533232.0 Ops/sec
some	4811180.0 Ops/sec
for	58846.5 Ops/sec
for with predefined size	130876.6 Ops/sec
while	2036007.0 Ops/sec

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 }

Run results for: for vs foreach vs some

Compare loop performance

for..in

foreach

some

for

for with predefined size

while