From: Scott Shaffer <lists@...>
Date: 2013-04-19T06:41:39+09:00
Subject: Re: confusion with Struct class

Love U Ruby wrote in post #1105300:
> ===============================
> Customer = Struct.new(:name, :address) do |x|
>   def x.greeting
>     "Hello #{name}!"
>   end
> end
>
> p Customer.greeting #=> "Hello Customer!"
> ===============================

You probably intended to write:

Customer = Struct.new(:name, :address) do
  def greeting
    "Hello #{name}!"
  end
end

This will create a method named "greeting" on ALL of your Customer 
structs. It's a neat trick, since the method won't be seen as a member 
of the struct.

I like even more that you can include a module:

module Greeter
  def greeting
    "Hello #{name}!"
  end
end

Customer = Struct.new(:name, :address) do
  include Greeter
end

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