Thanks everyone for your contributions to my education.
I now realise my original code could have been simplified (and sped up) like this:
sub zip
{
my ($str1, $str2) = @_;
my $zip;
for (0 .. length($str2)-1)
{ $zip .= substr($str1, $_, 1) . substr($str2, $_, 1) }
$zip .= substr($str1, length($str2));
return $zip;
}
Of course that only meets my original spec's (i.e. 2nd string must be the shortest) but it seems to be pretty fast (though I guess the concatenation would slow it down if my data was much longer).
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