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Re^2: What I Most Recently Learned in Perl, But Should Have Already Known

by izut (Chaplain)
on Aug 17, 2006 at 17:28 UTC ( #567974=note: print w/ replies, xml ) Need Help??


in reply to Re: What I Most Recently Learned in Perl, But Should Have Already Known
in thread What I Most Recently Learned in Perl, But Should Have Already Known

Continuing the if-else statements problem, the idiom I like most is:

my $function = 'a'; my %functions = ( 'a' => sub { ... }, 'b' => sub { ... }, ); $functions{$function}->();

It's amazing how this replace an entire switch or if-else statements.

Igor 'izut' Sutton
your code, your rules.


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Re^3: What I Most Recently Learned in Perl, But Should Have Already Known
by sfink (Deacon) on Aug 18, 2006 at 16:48 UTC
    I always run into the problem of the default case when I use that -- what if $function isn't a key in %functions? The error message "Undefined subroutine &main:: called" can be very difficult to figure out.

    And the straightforward fix isn't all that pretty:

    ($functions{$function} || $functions{default})->();
    But I admit that I still use it. With comments, if there is any chance that someone with a capacity to do me bodily harm might read the code.

      I think this way is prettier.

      sub do_something { my ($function) = @_; $function = 'default' unless exists $functions{$function}; $functions{$function}->(); }

      Igor 'izut' Sutton
      your code, your rules.

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