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Why does @test go out of scope in Aclass? When a.print_test is called, I get an undefined for @test.

class Aclass
  def print_test
    puts "@test from Aclass: " + @test
  end
end

a = Aclass.new
#a.print_test

#but still in scope here
puts "After print_test call: " + @test

On a side note, any one know how to get the run code button? I don't see it in the toolbar.

4thSpace
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1 Answers1

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@var is short hand to access an instance variable on the current instance of a class, or self. 

@test = 'what'
puts self
puts self.instance_variable_get :@test

class Aclass
  def print_test
    puts self
    puts self.instance_variable_get :@test
  end
end

a = Aclass.new
a.print_test

So the scope has changed between the main program and the instance of the class.

Matt
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  • The first `puts self` is `main`. The second is the `class`. What is `main`? – 4thSpace Aug 25 '16 at 04:54
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    That is a good question! Now, if only there were some website where one could [ask questions about programming](http://stackoverflow.com/q/917811/2988)? – Jörg W Mittag Aug 25 '16 at 06:43