in reply to using undef on a array

I don't know the subtle differences between the first two (I use them interchangably) but the third one: 
@a = undef;

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is assigning a one element list to @a.... It's actually doing something like: 
@a = (undef);

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Which is a relatively common error.

-Blake

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Re: Re: using undef on a array
by Biker (Priest) on Oct 31, 2001 at 14:41 UTC

    I think that the original problem was "how to clear out an array". (As usual, correct me if I'm wrong.) 

    $#my_array=-1;

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    f--k the world!!!!
    /dev/world has reached maximal mount count, check forced.

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[d/l]

In Section Seekers of Perl Wisdom