Contents

# Author::    Nicolas Pouillard  <[e-mail]>.
# Copyright:: Copyright (c) 2005 Nicolas Pouillard. All rights reserved.
# License::   GNU General Public License (GPL).
# Revision::  $Id: shuffle.rb 220 2005-05-09 12:28:26Z ertai $

class Array

  def shuffle! ( generator=nil )
    n = size
    n.times do |i|
      swap!(i, n.choose(generator))
    end
    self
  end

  def shuffle ( generator=nil )
    dup.shuffle!(generator)
  end

  def swap! ( i, j )
    self[i], self[j] = self[j], self[i]
  end

  def swap ( i, j )
    dup.swap!(i, j)
  end

end # class Array

Version data entries

2 entries across 2 versions & 2 rubygems

Version	Path
ruby_ex-0.1.1	src/shuffle.rb
vcs-0.2.148	ruby_ex/shuffle.rb