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    <p>I think you misunderstand prototypes a bit.</p> <p>Given a function <code>Foo</code>, <code>Foo.prototype</code> is not the prototype of the <code>Foo</code> object. It is the prototype that will be assigned to objects created using <code>new Foo()</code>. For example:</p> <pre><code>// This is a constructor that creates objects whose prototype is Person.prototype var Person = function(name) { this.name = name; } Person.prototype.sayHello = function() { console.log("Hello, my name is " + this.name); } var drew = new Person('Drew'); drew.sayHello(); // &lt;-- Logs a message drew.__proto__; // &lt;-- Not part of the Javascript spec, but it some browsers this is a reference to Person.prototype </code></pre> <p>Your main.get.registration could be implemented without prototypes:</p> <pre><code>main = function() {/* do stuff*/} main.get = function() {/* this is a getter function? */} main.get.registration = function() {/* I don't know what this does */} </code></pre> <p>What kind of interface or API are you hoping to create? Does it involve creating objects using <code>new</code>?</p> <p><strong>UPDATE:</strong> Here's one of many possible ways to implement what you want:</p> <pre><code>main = function() { // store a reference to this instance. var self = this; // Construct the get object. It doesn't need to be a function because it's never invoked this.get = {}; this.get.registration = function() { // Use self to refer to the specific instance of main you're interacting with. retrieveRegistrationFor(self); // &lt;-- pseudo-code } } </code></pre> <p><strong>UPDATE 2:</strong> Here's how to construct the <code>get</code> object using a constructor, allowing you to use prototypes for everything. I've capitalized the names of your constructors, which is a best practice that helps to differentiate between normal functions/methods and constructors.</p> <pre><code>// Constructor for the get object. This is only ever invoked in Main's constructor. Getter = function(mainInstance) { this.self = mainInstance; } Getter.prototype.registration = function() { retrieveRegistrationFor(this.self); // &lt;-- pseudo-code } Main = function() { // Construct the get object and attach it to this object. this.get = new Getter(this); } </code></pre> <p>As the other answers have pointed out, there are lots of ways to construct objects in Javascript. It all depends on the situation and your personal coding style.</p>
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    1. COI think I need to explain a little better in my answer, but yes it involves using `new`. I would be doing something like `var thisMain = new main(); thisMain.get.registration();` This is what I currently do, but when I attempt to do this, it spits out the error stated in the question.
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    2. CODid you mean to say `var thisMain = new main(); thisMain.get.registration()`? Also, when do you invoke the `get` function? If you never do, then `get` can be a plain object rather than a function.
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    3. COI did mean `thisMain.get.registration()`, but I caught it after the fact. I never directly invoke the `get` function, just `main`, which might be my issue.
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