# Hash of coderef solution (recommended).
use strict;
use warnings;
my %op_table = ( edit  => sub {   my $z = shift;
                                  print "in EditHandler, z=$z\n";
                                  return 1;
                              },
                 chmod => sub {   my $z = shift;
                                  print "in ChmodHandler, z=$z\n";
                                  return 2;
                              }
               );
sub invoker {
   my ($name, $z) = @_;
   exists($op_table{$name}) or return -1;
   $op_table{$name}->($z);
}
# Example calls.
invoker("edit", 42);
invoker("chmod", 99);
invoker("fred", 7);      # returns -1