Run results for: Javascript: Case insensitive string comparison

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.4.1

Device Platform: Mobile

Date tested: 2 years ago

toLowerCase()

11.2M/s

toLowerCase() FAIL

11.0M/s

Regex

7.8M/s

Regex FAIL

7.7M/s

View exact numbers

Test name	Executions per second
✓ toLowerCase()	11,210,658 Ops/sec
toLowerCase() FAIL	10,974,387 Ops/sec
Regex	7,787,918 Ops/sec
Regex FAIL	7,732,376 Ops/sec

Script Preparation code:

var a = "soFt"
var b = "Software Development"
var c = "doFt"

Tests:

toLowerCase()
a.toLowerCase() === b.toLowerCase()
Regex
const re = new RegExp(a, "gi") re.test(b)
toLowerCase() FAIL
c.toLowerCase() === b.toLowerCase()
Regex FAIL
const re = new RegExp(c, "gi") re.test(b)