Ultimate equivalence of PHP's isset
This is also served to declare default values in functions.
Seemingly, the solution is:
if (myvar == undefined)
A solution is given for this:
But I'd like to ask fellow posters here if it's really the right solutions.
add a global def (with no value) for undefined, e.g.
Use undefined. I doubt there are any IE5 browsers that have never been updated.
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