From: "Jörg W Mittag" <Joerg.Mittag@...>
Date: 2008-05-30T19:31:22+09:00
Subject: Re: PHP to Ruby (associative array to Hash)

S.D wrote:
> In the following PHP function, both 'types' and 'groups' are associative 
> arrays. I'm trying to rewrite this function in Ruby, using Hashes and I 
> haven't yet got it right. If someone with some insight into PHP and Ruby 
> could give it a look and see where my current code might be incorrect, I 
> 'd appreciate any pointers that might correct the results. The PHP 
> function is working; the Ruby version is not (yet) working. TIA for any 
> tips, criticism and suggestions that you can submit.
> 
> -- Steve
> 
> The original PHP function:
[...]
> public function getTypes($group_type=false) {
>   if(!$group_type) {
>     return $this->types;
>   }
>   else {
>     if(array_key_exists($group_type,$this->groups)) {
>       foreach($this->types as $key => $mt) {
>         if(in_array($key,$this->groups[$group_type])) {
>           $types[$key] = $mt;
>         }
>       }
>       return $types;
>     }
>     else {
>       return false;
>     }
>   }
> }
> 

Hi Steve!

This is my take. I shuffled things around a bit, e.g. using constants
instead of variables, but you'll figure it out ...

def types group = nil
  return TYPES unless group
  return nil unless GROUPS.include? group
  Hash[*TYPES.select {|suffix, mime_type| GROUPS[group].include? suffix}.flatten]
end

HTH, 
    jwm