From: David Unric <dunric29a@...>
Date: 2010-11-30T01:30:13+09:00
Subject: Confusion about singleton method definition

Hi fellow Rubists,

I'm just learning Ruby from The Well-grounded Rubist book and I cann't
understand why I cann't get the same results as in author's example.

It's about the difference between defining singleton method directly on
an object and using class << construct.
Rephrased example follows:

MYCONST=666

myobj = Object.new

class << myobj
  MYCONST=333
end

def myobj.outer_const
  puts MYCONST
end

class << myobj
  def inner_const
    puts MYCONST
  end
end


myobj.inner_const call displays 333 (singleton constant value) as
expected,
however myobj.outer_const call also displays 333 whereas it should
display the value of outer (global) MYCONST definition, ie. 666.


Did changed language definition recently somehow or is the example
and/or description in the book simply flawed ?

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