On Oct 10, 2007, at 3:53 PM, Garrett Smith wrote: > Typechecking is a problem. > > typeof is limited and allows host objects to return anything. The > problem is that some host objects return "function", for example, a > NodeList in Safari. This is perfectly legal, according to the spec.
See http://bugs.ecmascript.org/ticket/153 -- for a general, universal is-it-callable test, you would write if (it is Callable) ... > How is type checking addressed in ES4? The |is| operator tests universal or Platonic type, which involves shared, immutable type descriptors that do not vary across windows or frames. So if (a is Array) ... will work no matter where a was constructed. /be _______________________________________________ Es4-discuss mailing list Es4-discuss@mozilla.org https://mail.mozilla.org/listinfo/es4-discuss
