Here's one which zip()s an arbitrary number of arrays. If any of the arrays don't have enough elements, we pad with the empty string, cos that's what I needed at the time. Changing it to emit undefs would be trivial: 
sub zipn {
    local $[ = 0;
    [
        map {
            my $index = $_;
            map {
                defined($_[$_][$index]) ?
                    $_[$_][$index] :
                    ''
            } 0..$#_
        } 0 .. maximum(map { $#{$_[$_]} } 0..$#_)
    ]
}

sub maximum {
    local $[ = 0;
    ($#_ == 1) ?
        (
            ($_[0] >= $_[1]) ?
                $_[0] :
                $_[1]
        ) :
        maximum(maximum($_[0], $_[1]), @_[2..$#_]);
}

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Call it like so: 
zipn([1,2,3], [4,5,6], [7,8,9,10])

[download]
and it'll return this: 
[1,4,7,2,5,8,3,6,9,'','',10]

[download]
That maximum() function is a bit silly, getting rid of the recursion would make it way more efficient, but I firmly believe that "to recurse is divine".

In reply to Re: a little zip() by DrHyde
in thread a little zip() by broquaint

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