Module Pattern - Function as a model

// Function as a model
// A Module Pattern
var singleton = (function () {
    var privateVariable;

    function privateFunction(x) {
        // private variable    
    }

    return {
        firstMethod: function (a, b) {
            // privateVariable       
        },
        secondMethod: function (c) {
            // privateFunction       
        }
    };
}());