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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

new Map + Filter by Map

74K/s

Filter by Array

2K/s

View exact numbers

Test name	Executions per second
✓ new Map + Filter by Map	73,520 Ops/sec
Filter by Array	2,147 Ops/sec

Script Preparation code:

var urlList = Array.from(Array(1000)).map((_, i) => `${i}`)
var denyListArray = Array.from(Array(200)).map((_, i) => `${i * 3}`)

Tests:

Filter by Array
urlList.filter(url => !denyListArray.some(u => u === url))
new Map + Filter by Map
var denyListMap = new Map(denyListArray.map(u => [u, null])) urlList.filter(url => !denyListMap.has(url))