function type constructor

constructor.js

var constructor = function(spec, my) {
  var that = {},
      /* private instance variables */
      foo;
  /* shared objects */
  my = my || {};

  /** accessible method */
  that.hoge = function() {
    huga();
    alert(foo);
  };

  /** privileged method */
  function huga() { // var huga = function() {
    foo = spec.bar;
  }

  return that;
};

var myConstructor = constructor({ bar: "baz" });
myConstructor.hoge();