From: Logan Capaldo <logancapaldo@...>
Date: 2006-07-08T14:11:05+09:00
Subject: Re: newbie Q - calling a method for an object in an .each block?


On Jul 8, 2006, at 12:53 AM, william robb wrote:

> Hello All.  Sorry if this is obvious, but I have looked over the list
> (and pickax) and not been able to solve it.
>
> I am trying to iterate over a collection of objects, calling a method
> defined within each object.
>
> I have a class Card, with a method 'show' defined.
>
> I then create an array of these Card objects.  For example:
>> hand = Array.new
>> ace = Card.new( some_parameters )
>> hand[0] = ace
>> hand.push(Card.new( some_other_parameters))
> etc.
>
> Now,
>
>> ace.show #works:
> =>"Card:  A  of Spades
> hand[0].show # works, calls the 'show' method, executed for the first
> 'card', the ace:
> =>"Card:  A  of Spades"
>
> But,
>
>> hand.each {|c| c.show} # dosn't produces the following, which  
>> looks to me like a dump of the array:
> =>[#<Card:0x2647f8 @face="Up", @value=12, @suit="s">, #<Card:0x20e3e4
> @face="Up", @value=0, @suit="d">]
>
> I fear I am misunderstanding something fundamental here, as I thought
> the block parameter c should get each element of the array in turn,  
> and,
> each element being an object, I could call the methods associated with
> that object.
>
> Thanks for any insight,
>
> Will
>
>
>
> -- 
> Posted via http://www.ruby-forum.com/.
>

It's working but #each returns the array and your #show method  
returns a string, it doesn't have any side effects. You may want to  
use map instead or use puts

e.g.:

hand.each { |c| puts c.show }

or hand.map { |c| c.show }