Run results for: native built-in filter map function vs native logic for filter, map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36

Browser: Chrome 80

Operating system: Mac OS X 10.15.1

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
native built-in filter	10649815.0 Ops/sec
native logic for filter, map	12213854.0 Ops/sec
using forEach	9955179.0 Ops/sec

Script Preparation code:

var numbers = [10, 40, 230, 15, 18, 51, 1221, 24, 36, 28, 10, 6, 8, 7, 55, 89, 256, 102, 1, 23, 41, 38, 7, 2, 5, 9, 60]
var input = []
Array(10).forEach(_ => input.push(...numbers))

Tests:

native built-in filter
input.filter(i => i > 10).map(x => x * x)
native logic for filter, map
let result = [] for (let x in input) { if (x > 10) result.push(x) }
using forEach
let result = [] input.forEach(x => { if (x > 10) result.push(x) })

Run results for: native built-in filter map function vs native logic for filter, map

native built-in filter map function vs native logic for filter, map

native built-in filter

native logic for filter, map

using forEach