99 Bottles of Beer

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Language Ruby

(monkeypatch and anonymous procs)

Date:	04/04/07
Author:	J. B. Rainsberger
URL:	http://www.jbrains.ca
Comments:	0
Info:	ruby-central.org
Score:	(2.91 in 11 votes)

# 99 bottles of beer, monkeypatch plus anonymous procs.
# (c) J. B. Rainsberger 2007 All rights reserved, but I can be bribed.

class Fixnum
  BOTTLES_FACTORY = Hash.new { |hash, number|
    lambda {
      puts "#{number} bottles of beer on the wall."
      puts "#{number} bottles of beer."
      puts "Take one down, pass it around,"
      puts "#{number - 1} bottles appear on the wall!"
      puts
    }
  }.merge( {
    1 => lambda {
      puts "One bottle of beer on the wall."
      puts "One bottle of beer."
      puts "Take it down, pass it around."
      puts "No more bottles of appear on the wall!"
    },
    2 => lambda {
      puts "Two bottles of beer on the wall."
      puts "Two bottles of beer."
      puts "Take one down, pass it around."
      puts "One bottle appears on the wall."
      puts
    }
  })

  def sing_bottles_verse
    BOTTLES_FACTORY[self].call
  end
end

99.downto(1) { |i| i.sing_bottles_verse }

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Alternative Versions

Version	Author	Date	Comments
Using continuations, singleton classes	Victor Borja	09/15/06	9
minimal version	Anonymous	05/18/05	3
shows inheritance, iterators, yield, etc	Kian Wright	06/10/05	0
alternative version	Greg T.	05/18/05	10
In words	Daniel Straight	07/10/06	1
object-oriented version	Mike Gertz	04/20/05	2
wall-based OO version	Kevin Baird	07/07/05	2
Readably re-opening Integer, teetotaller	Eric Budd	01/06/08	0

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one program in 1500 variations