Run results for: Capitalize Regex vs Join

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36

Browser: Chrome 88

Operating system: Mac OS X 11.1.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Regex	658322.1 Ops/sec
Join	377016.5 Ops/sec

Tests:

Regex
const capitalizeFirstLetter = (str) => { if (!str || str.length < 1) return '' let capitalize = str.replace(/(^\w{1})|(-+[a-z])/g, (letter) => letter.toUpperCase()) return capitalize } const str = "Chicago-naperville-elgin, IL-IN-WI" capitalizeFirstLetter(str)
Join
const capitalizeFirstLetter = (string) => { if (!string || string.length < 1) return '' let capitalize = string .split(' ') .map((word) => word.charAt(0).toUpperCase() + word.slice(1)) .join(' ') return capitalize .split('-') .map((word) => word.charAt(0).toUpperCase() + word.slice(1)) .join('-') } const str = "Chicago-naperville-elgin, IL-IN-WI" capitalizeFirstLetter(str)