Rasmus Lerdorf skrev:
I think that is one of the strongest reasons not to implement something
actually. If there is a way to do something in a clear and concise
syntax, adding an alternate less clear syntax that isn't immediately
obvious to everyone simply obfuscates the language.
The other fatal blow to a feature like this is that it would be quite a
bit slower to compile and execute than the longer form because we now
can't simply do a single hash lookup in the function table when we see a
function. We first have to walk up the tree of objects to see if there
is a method with this name, and if there is no method, then we assume it
is a straight function call, unless of course there is a __call()
method, then what? Way too many gotchas here.
May I also add that the use of "with" is generally considered bad
practice by leading JavaScript gurus like Douglas Crockford, David
Flanagan, John Resig and PPK. I even have a vague memory of Brendan Eich
commenting upon the feature negatively as well.
Crockford speaks at:
http://yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/
Pro s& Cons are listed at:
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Statements:with
Erik Arvidsson warns against the use in JS at:
http://erik.eae.net/archives/2005/04/11/18.39.51/
Lars Gunther
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