From: Ryan Davis <ryand-ruby@...>
Date: 2008-11-22T04:53:21+09:00
Subject: Re: How to use include? on an array of objects


On Nov 21, 2008, at 09:44 , Fernando Perez wrote:

> I have the following array:
>
> [ product1, product2, product3 ]
>
> All products are of type Product. The Product class defines isntance
> attributes such as: title, description, price.
>
> Can I use include? to check if the array has a product which price is
> zero? if not what would I need to do? Iterate over each product and  
> set
> a variable if a match is found?

c'mon guys... teach a man to fish.

Fernando, check out ri. ri is your friend(tm).

% ri Array
% ri Enumerable

(Array includes Enumerable). There is a LOT of good stuff in  
Enumerable. You should poke around and learn as much of it as you can:

% ri Enumerable.find
% ri Enumerable.find_all

etc.

Other places to look are http://ruby-doc.org/ and the PragProg pickaxe  
book (Programming Ruby, 2nd ed).