Run results for: .startsWith() vs .test() vs .match() vs .indexOf()

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.5.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.5.1

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

string .startsWith()

9.6M/s

regexp .test()

9.2M/s

indexOf === 0

8.6M/s

string .match()

7.6M/s

View exact numbers

Test name	Executions per second
✓ string .startsWith()	9,556,515 Ops/sec
regexp .test()	9,193,771 Ops/sec
indexOf === 0	8,627,350 Ops/sec
string .match()	7,630,740 Ops/sec

Script Preparation code:

var html = "https://www.google.com";

Tests:

regexp .test()
/^https?:\/\//.test(html)
string .match()
!!html.match(/^https:\/\//)
indexOf === 0
html.indexOf('http://') === 0
string .startsWith()
html.startsWith('https://')