From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-04-21T15:59:19+09:00
Subject: Re: Module "re-opening"

On Wed, Apr 21, 2010 at 7:55 AM, tilde <tildeNO@spamautistici.org> wrote:
> Hi there, first time arond here for me, and first step with ruby ^^
>
> well, i come with a simple (maybe stupid) question:
>
> http://sprunge.us/BjJP?rb

(copying it here since it's small):

1 #! /usr/bin/env ruby1.9
2
3 module Math
4     private :sqrt
5 end
6
7 puts Math.sqrt(9)

> why this simple source doesn't do what is expected? (modify the visibility
> of sqrt module)
>

Because sqrt is a module method:


irb(main):001:0> module Math
irb(main):002:1> class << self
irb(main):003:2> private :sqrt
irb(main):004:2> end
irb(main):005:1> end
=> #<Class:Math>
irb(main):006:0> Math.sqrt(9)
NoMethodError: private method `sqrt' called for Math:Module
	from (irb):6
	from :0

Jesus.