From: matz@... (Yukihiro Matsumoto)
Date: 2004-05-26T12:36:50+09:00
Subject: Re: ruby-dev summary 23459-23562


In message "Re: ruby-dev summary 23459-23562"
    on 04/05/26, Florian Gross <flgr@ccan.de> writes:

|1) What will yield(*[]) do?

Same as "yield", not value attached.

|2) What will happen with these examples?
|
|    define_method(:foo) { |arg| result = arg }
|    foo(5); result # => 5 or ~> NameError?

5. There will be no in-block variables.

|    # Or more interesting:
|    define_method(:foo) { foo = nil; return true }
|    foo # => true or nil or NameError?
|    foo # => true or nil?

nil.  You will need to declare method local variables inside of
methods defined by define_method, for example:

  define_method(:foo) {local{|foo=nil| return true}}

|3) What will happen with these examples?
|
|    [1, 2, 3].each do |item|
|      [1, 2, 3].each do |item|
|        # Exception or reassignment of outer item or
|        # own private inner item?
|      end
|    end

Error (by shadowing variable) or warning.

|    [1, 2, 3].each do |item|
|      [1, 2, 3].each do |inner_item|
|        item += 1 if item == inner_item
|      end
|      p item
|    end

It will print 4,4,4, as it does now.

							matz.