AMD.js

//my-module.js
define([], function() {
  var privateVar = "Ben Cherry";
  var publicVar = "Hey there!";

  function privateFunction() {
      console.log( "Name:" + privateVar );
  }

  function publicSetName( strName ) {
      privateVar = strName;
  }

  function publicGetName() {
      privateFunction();
  }

  return {
      setName: publicSetName,
      greeting: publicVar,
      getName: publicGetName
  }
});

// index.js
define(['my-module'], function (myModule) {
  myModule.setName( "Paul Kinlan" );
});