Given two array refs, this will interleave their elements, returing one long array. Handy for taking two arrays (@keys, @values) and combining them into a hash.

"Extra" elements will be placed at the end. 

sub interleave {
    return @{$_[0]} unless @{$_[1]};
    return @{$_[1]} unless @{$_[0]};
    return shift(@{$_[0]}), shift(@{$_[1]}), &interleave;
}


print interleave( ['a'..'e'], [1..5] ), "\n";
my %hash = interleave( ['a'..'e'], [1..5] );

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