On Tue, Feb 16, 2010 at 16:57, Erik Arvidsson <[email protected]> wrote:
> One serious omission in your library is that traits cannot (could
> not?) be applied to existing objects. Adding traits to existing
> objects is important because it allows you to combine prototype based
> inheritance with traits by adding a trait to the prototype. Adding
> traits to the prototype, in turn makes composition a one time cost
> instead of per instance cost.
>
> function MyComponent() {}
> MyComponent.prototype = Object.create(MySuperClass.prototype);
> addTrait(MyComponent.prototype, eventTargetTrait);
> var c = new MyComponent;
> c.addEventListener('foo', bar);
>
I knew I should have looked at your updated library before posting. It
seems like you do support my scenario above by passing in the proto.
var EventTargetTrait = ...;
function MyComponent() {}
MyComponent.prototype = Trait.create(
MySuperClass.prototype, EventTargetTrait);
...
I still have use cases where adding traits to existing objects would
be useful but those are more obscure and can be done by setting
__proto__ to a new object (shudders).
--
erik
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