From: Damaris Fuentes <dfl_maradentro@...>
Date: 2006-07-09T04:37:28+09:00
Subject: Rescuing exceptions with "redo"

Hi aaall,

I have a code like this (from Why's (poignant) guide to Ruby, in 
http://poignantguide.net/ruby/chapter-5.html#section5):

****************************************************
class LotteryTicket
  NUMERIC_RANGE = 1..25

  attr_reader :picks
  def initialize( *picks )
     if picks.length != 3
      raise ArgumentError, "three numbers must be picked"
    elsif picks.uniq.length != 3
      raise ArgumentError, "the three picks must be different numbers"
    elsif picks.detect { |p| not NUMERIC_RANGE === p }
      raise ArgumentError, "the three picks must be numbers between 1 
and 25."
    end
    @picks = picks

  end

  def LotteryTicket.new_random
    new( rand( 25 ) + 1, rand( 25 ) + 1, rand( 25 ) + 1 )
  rescue ArgumentError
    redo
  end

end

ticket = LotteryTicket.new_random()
*****************************************
When the 3 random numbers created in this last line are not equal, 
everything goes right. However, when two or three are identical, the 
second argument error is raised and, theoretically, the method 
"new_random" should be run automatically again. However, an exception 
cames out:

in `new_random': unexpected redo (LocalJumpError)

This exception should not be launched... (I thought). Suggestions?

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