Well, writing void(0) is shorter and harder to misspell...
or you just write undefined instead of void(0) or void 0.
But since undefined is not a reserved word, anyone could write a line like
undefined = 3;
and break your code. This can be fixed, obviously, by something like
var UNDEFINED;
and using UNDEFINED instead of undefined (which should also save some
bytes when compressing with the YUI Compressor or the Closure Compiler).
Matt
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