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    <p>I've simplified Stoyan's example in an attempt to make it easier to understand what's going on. I've also commented it more thoroughly. </p> <pre><code>/*First define the modules of the sandbox. These will be defined as properties on the constructor function because this is a convenient place to keep them.*/ Sandbox.modules = {}; Sandbox.modules.returnNumbers = function(MYAPP) { MYAPP.return100 = function() {return 100;}; }; Sandbox.modules.returnLetters = function(MYAPP) { MYAPP.returnABC = function() {return "ABC";}; }; function Sandbox() { /* Because Sandbox is a constructor, an new object is automatically created. Because we're in the constructor, we refer to this new object as 'this'. A constructor would typically be used as part of an assignment, e.g. myObject = new Sandbox(). However, it's also legitimate javascript to use a constructor without the assignment by just writing new Sandbox() with no assignment. The constructor does return an object, it's just that it doesn't get assigned to anything so is discarded. We're going to add functionality (methods) to the 'this' object, but rather than returning it, we will pass it to the callback function, so the methods can be used immediately. */ var args = Array.prototype.slice.call(arguments); //Put the arguments //of the call to the Sandbox constructor in an array called args. var callback = args.pop(); //The last argument is the callback var requiredmodules = args; //The remaining arguments are the require // modules //For each of the modules in 'requiredmodules', add the module's //methods to 'this' for (i=0; i&lt; requiredmodules.length; i++) { Sandbox.modules[requiredmodules[i]](this); } //'this' now has methods returnNumbers and returnLetters //Call the callback. In the example below, 'this' will be called //MYAPP, which within the callback will have all the methods from //the required modules. callback(this); } //Finally here is an example of usage new Sandbox('returnNumbers', 'returnLetters', function (MYAPP) { console.log(MYAPP.return100()); console.log(MYAPP.returnABC()); }); </code></pre>
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