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Avoiding-Bugs: Extension of built-in-prototypes
I have just thought about possible side-effects
that can occur if we use an prototype-extension
with the same name twice. Uhh, that could be
horrible especially for teamwork, so that everyone
have to know exactly what extensions the other
did.
A really simple solution is to check wether that
extension exist before we define the extension, if so
we can throw an error otherwise our trace-window
stay nice and clean...;-)
if (Object.prototype.addClass != undefined) {
trace('ERROR: Object.prototype.addClass exist allready!');
}
Object.prototype.addClass = function (pConstructor) {
// Adds a class to an object, to the
// beginning of the proto-chain.
var tmp = this.__proto__;
this.__proto__ = pConstructor.prototype;
this.__proto__.__proto__ = tmp;
}
ASSetPropFlags(Object.prototype, null, 1, 0);
So we can stay concentrate on the real importent
things in our programms.
The little philosophy behind this test is the self-testing-code
philosophy. That means that we only get a message if an
error happens and we did not have to evaluate trace window
for inconsistencies by our self.
Posted by hOk at April 29, 2003 03:12 PM
Comments (1)
Ugh, i have just seen that there is
an big failure in the addClass-Method.
The proto-cain of the class to add
will be cutted-off behind the first
proto. But now i am to pooped, for
wrestling with proto-chains...;-)
regards, Holger
Posted by hOk at April 30, 2003 03:46 AM
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