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    <p>I'll start with the way I usually define classes:</p> <pre><code>function CustomDataType(a) { this.a = a; this.b = 2; } CustomDataType.prototype = { doX : function () {} }; var obj = new CustomDataType(1); </code></pre> <p>I assign variables in the constructor because <code>F.prototype = { a : [1,2,3]; }</code> is problematic, the array will be shared between instances unless the property is reinitialized in the constructor (problematic for all non-primitive types). And it's also needed when the property somehow depends on the arguments to the constructor. I declare methods in the prototype so that they are shared between all instances, if you use inheritance it means you can have super calls, it will also lead to less memory usage since the method only has to be allocated once (though that probably isn't a big issue).</p> <p>I have never used <code>Object.create</code>, I don't see any reason to do to that unless you are into some insane dynamic hackery.</p> <p>I use object literals whenever it feels unnecessary to create a separate class for the objects, for instance if it's arguments to a methods (so callers don't have to explicitly instantiate something), or if it's some internal values that shouldn't be accessed by anyone else.</p> <p>Your factory is essentially the same as the object literal. I suppose it can be useful if you need to create some jsonesque structure and set some default values.</p> <p>I don't see why <code>new</code> would be dangerous or unnecessary, in what context did he say that?</p> <p>But I think a lot of it comes down to taste. Be consistent and don't complicate things.</p>
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    1. POJavascript: what are some guidelines on how to define new data types?
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    1. USAdam Bergmark
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    1. COCrockford's problem with `new` is: "*If you forget to include the `new` prefix when calling a constructor function, then `this` will not be bound to a new object. Sadly, this will be bound to the global object, so instead of augmenting your new object, you will be clobbering global variables. <snip> A much better alternative is to not use `new` at all.*"
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    2. COAh, I remember reading about that, probably from him. You could do something like `function C(x) { if (this == window) return new C(x); this.x = x; }` I mess up a lot when i write JS, but I have never forgotten to write `new`...
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      1. USAdam Bergmark
 

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