// Global Variables
var windowWidth;

// Class definition
var App = function() {
    // App variables 
    var app = this;
    var debug = true; 

    this.init = function() {
        windowWidth = app.getWindowWidth();
    };

    // a simple logger
    this.log = function(data) {
        if(window.console && debug) {
            console.log(data);
        }
    };

    // Example of a dummy method
    this.getWindowWidth = function() {
        return $(window).width();
    };

    // Example of a dummy method with arguments
    this.animateImage = function(selector, positionX, duration) {
        selector.animate({'margin-left': '+='+ positionX +'px'}, duration);
    };

    // Example of a private dummy method
    var whatIsPI = function() {
        return Math.PI;
    };
};

// Instantiate the App class
var app = new App();

// Call the init method
app.init();

// Call public methods with arguments
app.animateImage($('.animated-image'), 400, 1200);

app.log('This is shown is the console');

// This will fail as we are trying to call a private method
app.log(app.whatIsPI());