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Schwartzian Transform vs. Building Hash of Function Results, Then Sorting on Function Results

by davebaker (Monk)
on Oct 16, 2006 at 18:54 UTC ( #578571=note: print w/replies, xml ) Need Help??

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  1. or download this
        my @output =
          map { $_->[0] }
          sort { $a->[1] cmp $b->[1] }
          map { [$_, expensive_func($_)] }
        @input;
    
  2. or download this
        foreach $_ (@input) {
            $result_for{$_} = expensive_func($_);
        }
    ...
        my @output
            = sort { $result_for{$a} cmp $result_for{$b}
                   } @input;
    

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[Corion]: Discipulus: Well, in many cases it doesn't make sense to build an interface and complicated program just to enter 20 rows into a database ;) But yes, automating data imports should pay off in the long run
[LanX]: Choroba: this happened before I joined, was still in uni, but my boss was summoned to the CEO of the second biggest German bank at that time and could only say " I told them its not ready" ;)
[LanX]: memories....I missed my connection while chatting
[Discipulus]: in this case Corion we are speaking about software licensing: evry year or two we must rescan the whole ced to produce an excel report, while at every activation / disactivation we update a black box DB: i said that i a week i can produce the perl to..
[Discipulus]: rend out the xls IF i have access to the DB
[choroba]: LanX I miss working in a bank sometimes...
[Corion]: Discipulus: Ooof. Especially yearly things are things I like to automate instead of trying to remember how I did things last year...
[Corion]: And the second rule that I've learned is, that there is no one-off job, so writing a program for it pays off almost immediately. The third rule is to give all my programs numbers and have them reproduce that number in the name of their output files. :)
[Discipulus]: the true part is that also specification change between years.. but well our job is cheap but dont abuse of us.. ;=)

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