JSFiddle - React, Tailwind, and code Playground

by oroce

JavaScript

String.prototype.capitalize = function() {
    return this.replace(/^(\w).*/ig, function(str, m) {
        console.log( arguments );
        return m.toUpperCase() + str.slice( 1 ).toLowerCase()
    });
};

alert( "mONGOL".capitalize() );