Run results for: .map().filter() vs .reduce vs .foreach()

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Windows

Device Platform: Desktop

Date tested: 6 months ago

.reduce()

17K/s

.map().filter()

8K/s

.forEach()

5K/s

View exact numbers

Test name	Executions per second
✓ .reduce()	16,780 Ops/sec
.map().filter()	8,465 Ops/sec
.forEach()	5,070 Ops/sec

Script Preparation code:

var array = [];
for (var i = 0; i < 10000; i++) {
  array[i] = i;
}

var firstTestResults = [];
var secondTestResults = [];
var thirdTestResults = [];

Tests:

.map().filter()
firstTestResults = array.map(value => { return value + 10; }) .filter(value => { return value % 2 === 0; });
.reduce()
secondTestResults = array.reduce((acc, value) => { value = value + 10; if (value % 2 === 0) { acc.push(value); } return acc; }, []);
.forEach()
array.forEach(value => { value = value + 10; if (value % 2 === 0) { thirdTestResults.push(value); } })