Run results for: foreach vs some vs for..of vs for with length vs map

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/100.0.4896.85 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 100

Operating system: iOS 15.4

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
foreach	43615.6 Ops/sec
some	41694.8 Ops/sec
for..of	16195.4 Ops/sec
for with length	27981.9 Ops/sec
map	900059.4 Ops/sec

Script Preparation code:

var array = new Array(1000);

Tests:

foreach
array.forEach(function(i) { array[i]; });
some
array.some(function(i) { array[i]; });
for..of
for (var i of array) { array[i]; }
for with length
var length = array.length; for (var i = 0; i < length; i++) { array[i]; }
map
array.map(function(i) { array[i]; });

Run results for: foreach vs some vs for..of vs for with length vs map

Compare loop performance

foreach

some

for..of

for with length

map