On Sun, Oct 23, 2011 at 11:11 AM, Axel Rauschmayer <[email protected]> wrote:
> > - instanceof: use for objects. >> > > It's *usable* on objects, but not all that *useful*, even with natives > like Array (they could have come from another frame). This is my biggest > problem with javascript's nominative types. Ducktyping helps, but meh. This > is one reason I'm so excited about private names and the de jure namespace > the module system gives us -- which can help sort this out once and for all. > > > Both are indeed welcome. I wonder how often the frame crossing is an issue > in practice. > If you control all of the code and like a constrained style, use instanceof. For robust code use instanceof only for RHS in the same library. Every time I write 'instanceof' I flinch from past surprises, cross frame, objects that should say true but don't (structurally true), objects that should say false but don't (monkey patched). jjb
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