From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-05-23T20:31:23+09:00
Subject: Re: initializing instance variables in a module

Simon Kr�ger wrote:
> module Foo
>  def bar(key)
>    @myvar ||= Hash.new {|k,v| k[v] = []}
>    @myvar[key]
>  end
> end
> 
> class Test
>   include Foo
> end
> 
> t = Test.new
> t.bar('baz') << 'eeek'
> p t.bar('baz')

Why not just

   module Foo
     def bar
       @bar ||= Hash.new{|hsh, key| hsh[key] = []}
     end
   end

   class Test
     include Foo
   end

   test = Test.new
   test.bar[:baz] << 'bur'

`a ||= b' returns `a' or, if `a' is nil, `b'.


Daniel