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Translated from matz blog, 2005-03-04

It would seem that the “Category” in Objective-C is near a selector namespace that I worried about since before. Though I can understand the basic concept of selector namespace, I have not been imagined the concrete behavior(and implementation). It is welcome that there is something to refer.

However, I have not understood the specification well in as far as I search by google. Is there a specific example for a concrete behavior and implementation?

Uh-oh, wait.

Anew I read the page I googled, it’s not said that the enable range is static scope. If so, is Category a “Mix-in that cannot be added a instance variable”? It is regrettable when that.

Though there are languages that have selector namespace, for example Smallscript(S#) and JavaScript(ECMAScript 4.0), I have not understood them as of now.

I welcome the information.