From: Glenn Jackman <glennj@...>
Date: 2009-08-27T02:10:13+09:00
Subject: Re: ||= with 1.8 and 1.9 ?

At 2009-08-26 11:00AM, "Aldric Giacomoni" wrote:
>  A friend of mine on Twitter recently posted this tidbit of code:
>  
>  class OrOrEquals
>    def test
>      @test
>    end
>  
>    def test=(test)
>      @test = test
>      'not test'
>    end
>  end
>  
>  p (OrOrEquals.new.test = 'test')
>  # ruby 1.8 returns 'test'
>  # ruby 1.9 returns 'test'
>  
>  p (OrOrEquals.new.test ||= 'test')
>  # ruby 1.8 returns 'test'
>  # ruby 1.9 returns 'not test'
>  
>  It works as indicated. Is this -normal- behavior ?

Not only that, this odd behaviour only happens for ||= and not for plain =

    $ cat orequal.rb
    puts RUBY_VERSION

    class OrOrEquals
      def test
        @test
      end

      def test=(test)
        @test = test
        'not test'
      end
    end

    o = OrOrEquals.new
    p o.test = 'a test'
    o.test = nil
    p o.test ||= 'a test'


    $ ruby orequal.rb
    1.8.7
    "a test"
    "a test"

    $ ruby19 orequal.rb
    1.9.1
    "a test"
    "not test"


-- 
Glenn Jackman
    Write a wise saying and your name will live forever. -- Anonymous