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    <blockquote> <p>...does the Prototype function have any purpose other than to achieve a mechanism of inheritance?</p> </blockquote> <p>I assume you mean the <code>prototype</code> property of <code>Function</code> objects. (There is no "Prototype function" in JavaScript.)</p> <p>It depends on what you mean by "inheritance." The purpose of the <code>prototype</code> property on <code>Function</code> instances is to specify the object that will be assigned as the prototype of objects created using that function as a constructor, e.g.:</p> <pre><code>var f = new Foo(); // Assigns `Foo.prototype` as `f`'s prototype </code></pre> <p>That way, <code>f</code> has access to the properties defined by that prototype. If that's what you mean by inheritance, then yes, that's the only purpose for the <code>prototype</code> property on functions.</p> <p>Note that now we have ECMAScript5, you can assign prototypes without using constructor functions, if you prefer, using the new <code>Object.create</code>:</p> <pre><code>var f = Object.create(somePrototype); // Assigns `somePrototype` as `f`'s prototype </code></pre> <p>Here's a more concrete example of both of those:</p> <p>Using a constructor function:</p> <pre><code>function Foo(name) { this.name = name; } Foo.prototype.hey = function() { console.log("Hi, I'm " + this.name); }; var f = new Foo("Fred"); // Assigns `Foo.prototype` as `f`'s prototype f.hey(); // Shows "Hi, I'm Fred" because `f` gets `hey` from its prototype </code></pre> <p>Using <code>Object.create</code>:</p> <pre><code>var fproto = { hey: function() { console.log("Hi, I'm " + this.name); } }; var f = Object.create(fproto); // Assigns `fproto` as `f`'s prototype f.name = "Fred"; f.hey(); // Shows "Hi, I'm Fred" because `f` gets `hey` from its prototype </code></pre> <p>So if you prefer only to use <code>Object.create</code>, and you're only using ES5-enabled engines, you could never use <code>Function#prototype</code> at all if you like.</p>
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