gistfile1.js

var obj = (function() {
  var func1 = function(options) {
    ...
  },

  func2 = function(options) {
    ...
  },

  func3 = function(options) {
    ...
    func1();
  };

  func4 = function(options) {
    ...
    func1();
    func2();
  };

  //This is a list of public functions, other ones (func1, func2) are private.
  //You will have ability to invoke only func3 and func4 for obj.
  return {
    func3: func3,
    func4: func4,
  };
})();