Run results for: Filter Array by Array vs Filter Array by Map

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.5

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

filter by Map

18K/s

Filter by Array

2K/s

View exact numbers

Test name	Executions per second
✓ filter by Map	17,709 Ops/sec
Filter by Array	1,616 Ops/sec

Script Preparation code:

var urlList = Array.from(Array(1000)).map((_, i) => `${i}`)
var denyListArray = Array.from(Array(200)).map((_, i) => `${i * 3}`)
var denyListMap = new Map(denyListArray.map(u => [u, null]))

Tests:

Filter by Array
urlList.filter(url => !denyListArray.some(u => u === url))
filter by Map
urlList.filter(url => !denyListMap.has(url))