#実用的なhelloworld

helloworld.js

String.prototype.capitalize = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
};

var Greet = function(greeting, objection) {
    this.greeting = greeting || 'hello';
    this.objection = objection || 'world';
    this.do = function() {
        console.log((this.greeting + ', ' + this.objection + '!').capitalize());
    };
    return;
}

var helloWorld = new Greet();
helloWorld.do();