From: Christopher Schneider <cschneid@...>
Date: 2006-12-15T03:41:25+09:00
Subject: Re: Hash/2-d array help!

If you're doing it incrementally, instead of all at once like  
demonstrated, the same end product can be done like:

hash = Hash.new

# LOOP
hash[key] ||= Array.new
hash[key] << value
# END LOOP

Just put the appropriate looping mechanism around those 2 lines, and  
define key and value (ie England=key, and Liverpool=value).

-Chris

On Dec 14, 2006, at 11:28 AM, Jason Roelofs wrote:

> hash = {
>  England => [Liverpool, London, Plymouth],
>  France => [Rennes, Paris]
> }
>
> Jason
>
> On 12/14/06, Just Maz <josquius@hotmail.com> wrote:
>>
>> Would anyone happen to know how would I go about creating a hash  
>> where I
>> have more then one value equating to another?
>> i.e. England => Liverpool, England => London, France =>Rennes,
>> England=>Plymouth, France=>Paris.
>>
>> I've tried all sorts of ways to do this but I always seem to  
>> overwrite
>> the old value of hash[england]=liverpool when I try and add London to
>> england too.
>> Is this even possible using a conventional hash? Or would I  
>> somehow have
>> to use a hash of arrays or something?
>> Also...Just how would I recall the values once I have them?
>> In my experiments I may well have stumbled across the answer but  
>> can't
>> retrieve them.
>>
>> Sorry for this question being rather vague but I don't even know the
>> name of what I'm trying to do or anything about how to do it..I'd
>> appreciate any help here, at the very least even just a pointer in  
>> the
>> right direction.
>>
>> --
>> Posted via http://www.ruby-forum.com/.
>>
>>