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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:122.0) Gecko/20100101 Firefox/122.0

Browser: Firefox 122

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Filter by Array	324.7 Ops/sec
filter by Map	26069.3 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))

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

Filter by Array

filter by Map