From: Josh Rowe <joshua@...>
Date: 2011-01-20T19:26:21+09:00
Subject: Re: Array within array question

Stefano Crocco wrote in post #976226:
> On Thursday 20 January 2011 18:34:26 Josh Rowe wrote:
>> puts deck[0[cdname]]
>>
>> Does anyone(I'm sure most of you) know how to get this to work with a
>> minimal amount of extra code.
>>
>> Regards Joshua
>
> puts deck[0][cdname]
>
> The [] method of class array (Array#[]), which is what you actually call
> when
> writing an_array[3] returns the object with that index in the array. In
> your
> case, deck[0] returns the element with index 0, that is the array card1.
> To
> retrieve the name of the card, you then access the element with index
> cdname
> of this array, again using []. To be more explicit, you can split the
> above
> line in two using an intermediate variable:
>
> card = deck[0]
> puts card[cdname]
>
> However I think that using arrays to represent cards isn't the best way
> to go.
> Arrays usually represent lists of things (for example, it's correct to
> use
> them for a deck of cards). The contents of your cards, however, aren't
> lists,
> since each item has a different meaning.
>
> A better way to represent cards would be to use hashes:
>
> card1 = {:name => "Ninja Monster", :type => "monster", :number => 1400}
> card2 = {:name => "Ninja Mage", :type => "monster", :number => 1600}
> deck = [card1, card2]
> puts deck[0][:name]
>
> I hope this helps
>
> Stefano

Thank you for that lightning quick response. I've just printed out some 
pages on Hashes from an ebook and from what I've seen your advice seems 
to be a good way to go. This game is only in early development and it's 
good to make changes like this near the start. I will start changing my 
other code to use hashes now. It's good to see such a great community 
like this forum which has lots of people who readily give up there 
expertise to help others.

Thanks again Stefano and have a good year in ruby programming!

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