From: Shak <sshaikh@...>
Date: 2009-12-05T01:15:09+09:00
Subject: const_defined?

Hi all,

Why would const-defined? as used below throw a NameError? Surely the whole
point of the method is to tell you what *isn't* defined? Or are we supposed
to look for an exception instead of false? If so, what's the best way of
knowing whether a module contains a certain class or not?

======
module Space
  class Time
    def hello
      puts 'Hello world!'
    end
  end
end

s = Space::Time.new
s.hello #Hello world!

clazz = Space.const_get('Time') #get class with name
obj = clazz.new #instatiate object
obj.hello #Hello world!

puts Space.const_defined?('Time') # true
puts Space.const_defined?('ime') #throws nameerror
========

Thanks!

Shak