Run results for: for vs foreach vs some [with effects]

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.6.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
for..in	4908057.0 Ops/sec
foreach	659214.1 Ops/sec
some	294716.0 Ops/sec
for	14827.1 Ops/sec
for with predefined size	13938.3 Ops/sec
while	4873671.0 Ops/sec

Script Preparation code:

var array = new Array(100);

Tests:

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

Run results for: for vs foreach vs some [with effects]

Compare loop performance

for..in

foreach

some

for

for with predefined size

while