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  1. or download this
    $op_map{$op_choice}->(@args);
  2. or download this
    &{$op_map{$op_choice}}(@args);
  3. or download this
    die "Unknown choice: $op_choice\n"
  unless my $cmd = $op_map{$op_choice};
  4. or download this
    my $default = 'OP1';
my $cmd = $op_map{$op_choice} || $op_map{$default};
  5. or download this
    $cmd->();
  6. or download this
    &$cmd; # see WARNING below