Ah, but you don't avoid the 'once-and-only-once' with the modified exists either. You'd have to write something like: 
    do {my $tmp = $_ -> {$client};
        return $$tmp if $tmp;} for $export_def->{'..client_default_ver
+sion'};

[download]

But then you have $tmp three times. And you can still leave the sigil off of $client and have strangely behaving code.

Abigail

In reply to Re: optimization - exists should return a reference by Abigail-II
in thread optimization - exists should return a reference by John M. Dlugosz

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