JS Module Pattern

module-pattern.js

var batman = (function () {
    var identity = "Bruce Wayne";

    return {
        fightCrime: function () {
            console.log("Cleaning up Gotham.");
        },

        goCivilian: function () {
            console.log("Attend social events as " + identity);
        }
    };
})();

// Outputs: undefined
console.log(batman.identity);

// Outputs: "Attend social events as Bruce Wayne"
batman.goCivilian();