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Re: Finding the max()/min()

by tmoertel (Chaplain)
on Nov 11, 2004 at 05:12 UTC ( #406927=note: print w/replies, xml ) Need Help??

in reply to Finding the max()/min()

As others have mentioned, it's handy to capture min and max logic in subroutines for reuse. Most times, if you have a max subroutine, for example, it will take an array and return the maximum element. That's great if you want to hold all of your values in memory, but what if you don't? What if you want to compute your maximum iteratively, e.g., one number at a time while reading from a file?

As I offered in Re: getting the highest value in a simpler way, we can encapsulate our logic inside of a closure-based factory function that makes "maximum finders":

sub make_max_finder { my $max; sub { for (@_) { $max = $_ if !defined $max || $_ > $max } $max; } }
The nice thing about this approach is that the logic is captured in one place and yet we can use it both on big arrays and upon iterated-over data. The array method:
make_max_finder->(1..10); # 10
The iterative, light-on-memory method:
my $max_finder = make_max_finder(); $max_finder->($_) while <>; $max_finder->(); # retrieve maximum


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[Corion]: Hi Lady_Aleena!
[Lady_Aleena]: Corion, how are things?
[Corion]: Lady_Aleena: Quite good ;) I'm working four days now, instead of five, which helps my mood and my weekends tremendously
[Corion]: My Perl output hasn't recovered, but as $work is still somewhat stressful, I don't think this would be different with a five day workdweek
[Lady_Aleena]: Corion, that is a good thing (TM) 8)
[Corion]: And this evening, I'm actually dusting off some old module of mine and bringing it up to the last version of the library I'm wrapping
[Lady_Aleena]: Updating things can be fun, if there is a better way to do it.

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