how to use the javascript module pattern in a real example?

Question

I am trying to understand the JavaScript Module Pattern. I\'ve seen examples of what it should look like, but I don\'t understand how to use it.

For example, a few thing

Answer 1

The revealing module pattern is used like this:

var moduleName = (function () {
    var privateVariable = 'private';

    var privateMethod = function () {
        alert('this is private');
    };

    // this is the "revealed" part of the module
    return { 
        publicVariable: 'public',
        publicMethod: function () {
            alert('this is public');
        }
    };
}());

You can also define the public variables/methods as privates and then expose a reference to them, making them public. This is a matter of preference.

In your example, if you wanted addMessage to be part of the module, you would do it like this:

var moduleName = (function () {
    // this becomes public due to the reference exposure in the return below
    var addMessage = function () {
        // do whatever
    };

    // this is the "revealed" part of the module
    return { 
        addMessage: addMessage
    };
}());

moduleName.addMessage();