var MyApp = {};

MyApp.MyModule = function(arg1) {
    //Private methods
    var methodOne = function() {};
    var methodTwo = function() {};

    return (function() {
        var self = {};

        self.init = function() {
            console.log('hoistable/before: ' + hoistable); //returns undefined
            hoistable = arg1;
            console.log('hoistable/after: ' + hoistable);  //returns value of arg1
        };

        return self;
    })();

    //Private variables
    var hoistable, anotherVar, yetAnother;
}