Library pattern

gistfile1.js

(function MyLibrary(window) {
  var privateVar;
  
  function init() {
    // do whatever is necessary here
    privateVar = 'initial state';
  }
  
  function publicMethod() {
    // this function is exposed
  }
  
  function privateMethod() {
    // this function is protected in the IIFE
  }
  window.MyLibrary = {
    init : init,
    publicMethod : publicMethod
  };
})(window);