From: Phrogz <gavin@...>
Date: 2007-03-18T08:15:05+09:00
Subject: Re: attr_accessor question

On Mar 17, 9:50 am, Corey Konrad <0...@hush.com> wrote:
> ah ok i understand that i am just learning all this OO stuff i just
> thought i needed to use the initialize method but i dont even need to
> create one for a default object state at all i can just do this as well
> and the program worked fine,
>
> class Animal
>   attr_accessor :color
>   attr_accessor :size
> end
>
>  that is pretty cool i'm having a fun time learning this language
> compared to something like vb.net.

Ruby also has a nice class named Struct for easily creating classes
(or starting them off) that are just piles of optional attributes by
name:

[sliver:~] gkistner$ irb
irb(main):001:0> Animal = Struct.new( :color, :size )
=> Animal
irb(main):002:0> a1 = Animal.new
=> #<struct Animal color=nil, size=nil>
irb(main):003:0> a1.color
=> nil
irb(main):004:0> a1.color = :blue
=> :blue
irb(main):005:0> a1
=> #<struct Animal color=:blue, size=nil>
irb(main):006:0> a2 = Animal.new( :orange )
=> #<struct Animal color=:orange, size=nil>
irb(main):007:0> a3 = Animal.new( :red, 42 )
=> #<struct Animal color=:red, size=42>
irb(main):008:0> a3.size = 50
=> 50
irb(main):009:0> a3
=> #<struct Animal color=:red, size=50>