Run results for: forEach vs reduce vs map vs filter vs for j--

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; Redmi Note 5 Pro) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Mobile Safari/537.36

Browser: Chrome Mobile 84

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
forEach	86.1 Ops/sec
reduce	85.9 Ops/sec
map	83.5 Ops/sec
filter	83.4 Ops/sec
for	92.8 Ops/sec

Script Preparation code:

var arr = [];
for (var i = 0; i < 12345; i++) {
  arr[i] = i;
}

function someFn(i) {
  return (i * 3 * 8 / 1200 * 0.002 / 40 * 0.2);
}

var sumForEach = 0,
  sumReduce = 0,
  sumMap = 0,
  sumFilter = 0,
  sumFor = 0;

Tests:

forEach
arr.forEach(item => sumForEach += someFn(item));
reduce
sumReduce = arr.reduce((lastValue, item) => { return sumReduce += someFn(item); });
map
arr.map(item => (sumMap += someFn(item)));
filter
arr.filter(item => (sumFilter += someFn(item)));
for
for (var j = arr.length-1; j >= 0 ; j--) { sumFor += arr[j]; }