factory.js

//factory style, more involved but more sophisticated
myApp.factory('helloWorldFromFactory', function() {
    return {
        sayHello: function() {
            return "Hello, World!"
        }
    };
});

//Controller
myApp.controller('ExampleCtrl', function($scope, helloWorldFromFactory){
   console.log(helloWorldFromFactory.sayHello() ); 
});