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    <p>You are defining a constructor but expecting that it behaves like a function. The constructor, however, just sets values in the object to be returned. Since your constructor does not set any attributes in the initializing object, it really does not useful.</p> <p>You have some alternatives:</p> <ol> <li><p>Initialize the class as @amaud sugested.</p></li> <li><p>Returns the value from the constructor as @amaud sugested (which does not make much sense to me. This is not the function of a constructor as I feel it. In this case the solution #3 seems better).</p></li> <li><p>define a function instead of a class. IMHO, is the most simple and functional solution</p> <pre><code>@Point = (x, y) -&gt; if Float32Array? then Float32Array([x,y]) else Array(x,y) </code></pre></li> <li><p>If you want <code>Point</code> to be either a specialization of <code>Float32Array</code> or <code>Array</code>, use the option #1 but make <code>Point</code> to inherit from the class you want:</p> <pre><code>superclass = if Float32Array? then Float32Array else Array class @Point extends superclass constructor: (x,y) -&gt; @[0] = x @[1] = y </code></pre></li> </ol> <p><strong>EDIT</strong>: @amaud676875 posted an interesting question as a comment. Since a reasonable answer would involve some code, I am posting the answer as a edit.</p> <p>@amaud, for verifying your point, I wrote the following CoffeeScript module:</p> <pre><code>class Float32Array extends Array first: -&gt; # Just for testing @[0] superclass = if Float32Array? then Float32Array else Array class @Point extends superclass constructor: (x,y) -&gt; @[0] = x @[1] = y </code></pre> <p>Then I imported the module in the console:</p> <pre><code>coffee&gt; point = require './point' { Point: { [Function: Point] __super__: [ constructor: [Object], first: [Function] ] }, Float32Array: { [Function: Float32Array] __super__: [] } } </code></pre> <p>and created a <code>Point</code>:</p> <pre><code> coffee&gt; p = new point.Point 3, 2 [ 3, 2 ] </code></pre> <p>This <code>Point</code> has the <code>first()</code> method from <code>Float32Array</code>:</p> <pre><code> coffee&gt; p.first() 3 </code></pre> <p>and <code>instanceof</code> says it is an instance of <code>Float32Array</code>, too:</p> <pre><code>coffee&gt; p instanceof point.Float32Array true </code></pre> <p>So I bet <code>new Point x, y</code> returns an instance of <code>Float32Array</code>. Of course it is an instance of <code>Point</code>, too, and it is not a problem because <code>Point</code> <em>is-a</em> <code>Float32Array</code>, to use a classical OOP expression.</p>
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    1. POCoffeeScript: How to return a array From class?
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    1. COAre you sure `new Point(x,y)` really returns a Float32Array instance ? doesn't seem to
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    2. CO@amaud I responded as an edit in my post. See if it clarifies/make sense of the situation.
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    3. COThanks! Does it works with the native Float32Array too ? (c.f. `class Float32Array extends Array`). To me it seems that these typed arrays are a bit special, and I'm not sure you would inherit the benefits of those.
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