http://www.perlmonks.org?node_id=392137


in reply to improve ugly flow control

Just a different try on this:
use List::Util qw(first); if (defined(my $try = first { $hash{$_} } @options)) { do_something($try); } else { log_failure(); }

-- Randal L. Schwartz, Perl hacker
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Re^2: improve ugly flow control
by perrin (Chancellor) on Sep 19, 2004 at 20:52 UTC
    That's a neat idea. Unfortunately, in my real code, the $hash{$_} test is actually something expensive, so I need to stop as soon as one of the options works. I should have made a better example.
Re^2: improve ugly flow control
by Aristotle (Chancellor) on Sep 20, 2004 at 09:50 UTC

    I liked that quite a bit, but the structure has been bothering me, like with most other solutions: it feels to me like the failure case gets too much emphasis. I didn't know how to do any better when I first saw the post, though. But now I think I do:

    { my $try = first { $hash{ $_ } } @options; defined $try or ( log_failure(), last ); do_something( $try ); }

    Makeshifts last the longest.