Run results for: isUpperCase

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser: Chrome 107

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Tests:

char code
var isUpperCase = c => 'A' <= c && c <= 'Z'; for(c = 0; c < 128; c++) { isUpperCase(String.fromCharCode(c)); }
regex
var isUpperCase = c => /[A-Z]/.test(c); for(c = 0; c < 128; c++) { isUpperCase(String.fromCharCode(c)); }
toLowerCase
var isUpperCase = c => c !== c.toLowerCase(); for(c = 0; c < 128; c++) { isUpperCase(String.fromCharCode(c)); }