You may have missed the 1JS and typeof null messages. We cannot remove "function" or make any other such backward-incompatible change. But we could add new results.
The problem with instanceof is that it fails cross frame. The invariant two-way implication relating == and === that I gave is important, and for value objects such as int64 and uint64 I argue it implies new typeof results. /be On Sep 29, 2012, at 3:46 PM, "Uli Riehm" <[email protected]> wrote: > I think typeof should be simplified, focusing more on instanceof: typeof > should only return "undefined", "string", "number", "boolean" and "object". > > var fn = function () { }; > fn instanceof Function // true > fn instanceof Object // true > > Because typeof returns a string it is never true for two different types, so > instanceof is more detailed. Problems would be that Null, NotANumber, > Infinity habe to be functions, so that a null can also be instanceof an > Object and a NaN instanceof NotANumber Number Object. Using an Int64 Function > where the prototype is Number, we could also have an instanceof Int64 Number > Object. > > I'm also tweaking around instanceof in my article on > http://metadea.de/V/default.aspx#V_construct_and_your_class ... please see > how I'm creating 'class' functions, having real OOP in jS, using instanceof, > featuring reflection using a V.Construction Object class info (that is also > used for prototyping a base function) and an the implicit instanceOf and > constructionOf functions. Without hacking around __proto__ . > > However I'd like to say that in the part of "Why javaScript typeof operator > should be deprecated" I didn't thought properly about primitives and the > usage of the operators that my idea would completely break ;) So please read > that part with this warning in mind, but there are also some thoughts on > primitives that are boxed to Object. > To say simple what I need to change in the ...deprecated... part is, that > typeof and primitives should keep, but the constructor and the primitives > corresponding Object instances should be the way described. > > Uli > _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
