From: 7stud -- <lists@...>
Date: 2012-09-20T13:09:18+09:00
Subject: Re: Class variables

class Card
  attr_accessor :suit
  attr_accessor :value
  attr_accessor :name
  attr_accessor :picture
  attr_accessor :hcp

Those are all method calls.  Do this instead:

  attr_accessor :suit, :value, :name, :picture, :hcp


Don't do this:


 def new(value, suit)
    @value = value
    @suit = suit
  end

Do this instead:

  def initialize(value, suit)
    @value = value
    @suite = suit
  end

obj = MyClass.new(3, 'diamonds')

Return statements aren't used so much in ruby because a method returns
the result of the last statement that was evaluated.  So don't do this:

  def hcp()
    return @hcp
  end

Do this:

  def hcp
    @hcp
  end

However, calling attr_accessor :hcp is equivalent to writing the
following in your class:

  def hcp
    @hcp
  end

  def hcp=(val)
    @hcp = val
  end


The implementation of class variables in ruby:

@@suits = ['C', 'D', 'H', 'S']

isn't what you would expect, so no one uses them.  Rubyists use class
instance variables instead, e.g.

class Dog
  @my_var

end

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