Run results for: forEach vs reduce vs map vs filter vs for eac2!1!

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows 7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

forEach

3K/s

reduce

3K/s

map

2K/s

filter

2K/s

for

2K/s

View exact numbers

Test name	Executions per second
✓ forEach	2,634 Ops/sec
reduce	2,613 Ops/sec
map	2,244 Ops/sec
filter	2,089 Ops/sec
for	1,516 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 of arr) { sumFor += someFn(j); }