From: Philipp Hofmann <phil@...126.de>
Date: 2008-03-03T13:05:40+09:00
Subject: Re: [QUIZ] Hello, world? (#158)


# i -- raising an HelloWorldError

class HelloWorldError < StandardError
  def to_s
    "Hello, World!"
  end
end
module Kernel
  def raise(e)
    puts e
  end
end
raise HelloWorldError.new


# ii -- a lost and found HelloWorld

class HelloWorld
  def to_s
    "Hello, World!"
  end
end
HelloWorld.new
ObjectSpace.each_object { |o| puts o if o.is_a?(HelloWorld) }


# iii -- a little curry

hello = lambda { |a| "Hello, #{a.call}"}
world = lambda { "World!" }
puts hello.call(world)


# iv -- in only one line but to ruby instances

puts `ruby -e 'puts "Hello, World!"'`


# v -- and finally a probabilistic approach
# beware this one is not tested yet!
# which means the the test is still running and at
# least it didn't raise any errors so far ;)

goal = "Hello, World!\n"
bytes = goal.split(//).map { |e| e[0] }.uniq

seed = 0
until false
  srand(seed)
  i = 0
  while i < goal.size
    c = rand(bytes.size)
    break if bytes[c] != goal[i]
    i += 1
  end
  break if i == goal.size
  seed += 1
end

goal.size.times { print bytes[rand(bytes.size)].chr }



g phil