ruby singleton examples

ruby_singleton.rb

require 'singleton'

class MySingleton
  include Singleton
  attr_accessor :myvar

  def initialize 
    puts 'output from initialize in a singleton!'
  end
end

MySingleton.instance.myvar = 'foo'
puts MySingleton.instance.myvar

class MyStaticClass

  @myvar = 'bar'
  class << self

    attr_accessor :myvar
  end
end

puts MyStaticClass.myvar

class MyUglyStaticClass

  @@myvar = 'cat'

  def self.cat 
    @@myvar
  end

  def self.set_cat(name)
    @@myvar =cat
  end
end

puts MyUglyStaticClass.cat