From: "Aleksi Niemelä" <aleksi.niemela@...>
Date: 2000-11-14T10:16:35+09:00
Subject: [ruby-talk:6332] Re: dup vs clone

> Eval seems reasonable. If you _know_ that the name is a class, you
> could also use Object.const_get(string)
> 
>    Object.const_get("Array")		# => Array

Eval is probably good. But the simple way doesn't always work. The problem
is the classes which are inside a name space:

  module Foo
    class Bar
    end
  end

  def find(klass,name)
    begin
      k = klass.const_get(name)
      puts "Found #{name} from #{klass}, so it is #{k}"
    rescue NameError
      puts "Did not find #{name} from #{klass}"
    end
  end

  [Object, Module, Module.const_get("Foo")].each do |klass| 
    ["Foo", "Bar"].each do |name| 
      find(klass, name)
    end
    puts
  end

Outputting:

  Found Foo from Object, so it is Foo
  Did not find Bar from Object
  
  Found Foo from Module, so it is Foo
  Did not find Bar from Module
  
  Found Foo from Foo, so it is Foo
  Found Bar from Foo, so it is Foo::Bar

	- Aleksi