From: 7stud -- <bbxx789_05ss@...>
Date: 2011-02-26T09:40:49+09:00
Subject: Re: parsing rule for this code?

John Feminella wrote in post #983784:
> As a rule of thumb, variables exist until you reach the "end" or
> closing brace of the innermost block that they're still contained in.
> In your case, you have this:
>
>>    def do_something
>>        3.times do |x|
>>            number = 10
>>        end
>>        puts number
>>    end
>
> The local variable `number` is created with the value 10 and then
> immediately discarded. This happens three times, since the block
> executes three times.
>
> The goal of the next statement is to print a local variable called
> `number`. But there is no such local variable in this block. So Ruby
> rightfully complains that you didn't define it.


Actually, I think the parser determines that 'number' in the line:

  puts number

is a method.  See this code:

class Dog

  def method_missing(name, *args)
    puts "*** #{name.to_s} ***"
    super
  end

  def test
     3.times do
       number = 10
       puts number
     end

     puts number
  end
end

Dog.new.test


--output:--
10
10
10
*** number ***

Line 5:in `method_missing': undefined local variable or method `number' 
for #<Dog:0x401bf798> (NameError)
  from t.rb:14:in `test'
  from t.rb:18

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