Run results for: 2Sum array: for vs forEach vs for..in vs for..of vs reduce

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.6.1

Device Platform: Mobile

Date tested: one year ago

reduce

6.4M/s

for

338K/s

for..of

237K/s

for in

234K/s

foreach

225K/s

View exact numbers

Script Preparation code:

var array = new Array(100);
for (let i = 0; i < 100; i++) {
  array[i] = i * i;
}

Tests:

for
let sum = 0 for (let i = 0, l = array.length; i < l; i++) { sum += array[i]; }
foreach
let sum = 0; array.forEach(function(i) { sum += array[i]; });
for in
let sum = 0; for (var i in array) { sum += array[i]; }
for..of
let sum = 0; for (var i of array) { sum += array[i]; }
reduce
array.reduce((a, b) => a + b, 0);