Run results for: regex vs startsWith vs indexOf perf on url

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6,2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.7

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
indexOf	2302204.5 Ops/sec
startsWith	2166252.0 Ops/sec
regex	1182012.1 Ops/sec

Script Preparation code:

const urls = ['/pl/sdkjfdhsalkjhas', '/go/lasdkfhaskljdhflaksjdhflaksjhdf', '/FI/FI/OFEJ'];
const STARTS_WITH = ['/go/', '/pl'];
const EQUALS = ['/FI/FI/OFEJ', '/fi/fi/ofej'];
const ex = /^\/(go\/|pl\/|FI\/FI\/OFEJ)\W*/;

Tests:

indexOf
const urls = ['/pl/sdkjfdhsalkjhas', '/go/lasdkfhaskljdhflaksjdhflaksjhdf', '/FI/FI/OFEJ']; const STARTS_WITH = ['/go/', '/pl']; const EQUALS = ['/FI/FI/OFEJ', '/fi/fi/ofej']; urls.map(url => STARTS_WITH.filter((starts) => url.indexOf(starts) !== -1)).length > 0;
startsWith
const urls = ['/pl/sdkjfdhsalkjhas', '/go/lasdkfhaskljdhflaksjdhflaksjhdf', '/FI/FI/OFEJ']; const STARTS_WITH = ['/go/', '/pl']; const EQUALS = ['/FI/FI/OFEJ', '/fi/fi/ofej']; urls.map(url => STARTS_WITH.filter((starts) => url.startsWith(starts) !== -1)).length > 0;
regex
const urls = ['/pl/sdkjfdhsalkjhas', '/go/lasdkfhaskljdhflaksjdhflaksjhdf', '/FI/FI/OFEJ']; const STARTS_WITH = ['/go/', '/pl']; const EQUALS = ['/FI/FI/OFEJ', '/fi/fi/ofej']; const ex = /^\/(go\/|pl\/|FI\/FI\/OFEJ)\W*/; urls.map(url => STARTS_WITH.filter((starts) => url.match(ex) !== -1)).length > 0;

Run results for: regex vs startsWith vs indexOf perf on url

compare url path matching perf

indexOf

startsWith

regex