I'll start by saying that I have absolutely no idea what this thing that I'm calling a decision hash actually is. That aside, I've got a hash constructed which has strings as keys & function calls as values. I'm using it as a case statement- calling the hash with some value that will match a key so that a function will be run on the input that I'm providing.

My problem is with how to get something to be passed into the selected function. It looks like whatever i pass in is turned into "1" -but you can return whatever you want. Am I totally wasting my time getting this to work, or is there actually someway to set up a hash to have a value passed in & run a function on it?

the program: 

#!/usr/bin/perl -w

use strict;
use Data::Dumper;

&main;
sub main{
  
  my $i = "x";
  my @choices = ("a", "b", "c");

  my %decision_hash = (a => \&mirror_input,
               b => \&return_reference,
               c => \&do_stuff);

  foreach my $case(@choices) {
   my  @results = &{$decision_hash{$case}}($i);

   print "$case:";
   print Dumper(@results);
  }
}

sub mirror_input {

  my $input = @_;
  print "input:";
  print Dumper($input);
  print "\n";
  return $input;
}


sub return_reference {
  my $input = @_;
  my %temp;
  $temp{1} = ["z", "x", "y"];
  $temp{2} = ["s", "d", "f"];
  
  return \%temp;
  
}

sub do_stuff {
  my $input = @_;
 
  my $new = "something new";
  return ($new);
  
}

[download]

here is the output:

input:$VAR1 = 1;

a:$VAR1 = 1;
b:$VAR1 = {
          1 => [
                 'z',
                 'x',
                 'y'
               ],
          2 => [
                 's',
                 'd',
                 'f'
               ]
        };
c:$VAR1 = 'something new';

[download]

I'm *really* hoping that someone will just tell me that i'm overlooking something incredibly obvious here.

In reply to How to pass a variable to function selected from a hash by cat2014

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