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    <p>With a bit of foresight you can do this pretty easily <em>and</em> protect yourself against using <code>eval</code>. Keep a list somewhere of the classes that you want to instantiate by name:</p> <pre><code>class Dog bark:-&gt; "Woof" # Or window.named_classes if you need to access # `named_classes` globally (or just in another # CoffeeScript file). named_classes = { Dog: Dog } </code></pre> <p>and then use your lookup table instead of <code>eval</code>:</p> <pre><code>name = 'Dog' dog = new named_classes[name] </code></pre> <p>When you say <code>class Dog</code>, you end up with a local variable called <code>Dog</code>:</p> <pre><code>var Dog; Dog = (function() { /* ... */ })(); </code></pre> <p>and there's no way to get at a local JavaScript variable unless you store it somewhere that you can access by name. Also note that <code>eval</code> won't work if you define <code>Dog</code> in one CoffeeScript file and want to access it another, <a href="http://coffeescript.org/#lexical_scope">CoffeeScript wraps each file in self-executing anonymous function to limit variable scope</a>:</p> <blockquote> <p>all CoffeeScript output is wrapped in an anonymous function: <code>(function(){ ... })()</code>; This safety wrapper, combined with the automatic generation of the <code>var</code> keyword, make it exceedingly difficult to pollute the global namespace by accident.</p> <p>If you'd like to create top-level variables for other scripts to use, attach them as properties on <strong>window</strong>, or on the <strong>exports</strong> object in CommonJS.</p> </blockquote>
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    1. POInstantiate a CoffeeScript class from a class name in a string
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    1. COTo add to that, rather than collecting them after the fact, you might find it more convenient to namespace them to start with. Somewhere before everything else: `myClasses = {}` Later on: `class myClasses.Dog` Finally: `dog = new myClasses["Dog"]`
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    2. CO@Chris: Yes, that's a good point. You could use `class window.Dog` or `class window.named_classes.Dog` but `window.Dog` risks polluting `window` and `window.named_classes.Dog` makes local access to `Dog` a bit cumbersome. You could also do `named_classes.Dog = class Dog ...` but that is, IMO, a bit ugly.
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    3. CO@Chris: Looks like we're editing comments at the same time (and my internet connection is dodgy!). Anyway, there are various ways to get the desired effect, the important thing is to store a reference to the class in an object somewhere so that it has a program-accessible name.
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