Run results for: for vs forEach vs reduce

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.81 Safari/537.36

Browser: Chrome 72

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Test For	118586.9 Ops/sec
Test ForEach	175056.0 Ops/sec
Test Reduce	166607.5 Ops/sec

Script Preparation code:


var arr = [];
for(var i = 0; i < 20; i++) {
  arr.push(i);
}

function someFn(i) {
  return (i * 3 * 8 / 1200 * 0.002 / 40 * 0.2);
}

var sumFor = 0;
var sumForEach = 0;
var sumReduce = 0;

Tests:

Test For
for(var i = 0; i < arr.length; i++) { sumFor += someFn(arr[i]); }
Test ForEach
arr.forEach(value => sumForEach += someFn(value))
Test Reduce
sumReduce = arr.reduce((lastValue, item) => { return sumReduce += someFn(item); });

Run results for: for vs forEach vs reduce

Benchmark to test performance of for vs forEach vs reduce when N is under 50

Test For

Test ForEach

Test Reduce