Enumerable Examples

fibanocci.rb

class Fibonacci                                                                                                                           
  include Enumerable                                                                                                                      
                                                                                                                                          
  def initialize                                                                                                                          
    @this = 1                                                                                                                             
    @next = 1                                                                                                                             
  end                                                                                                                                     
                                                                                                                                          
  def each                                                                                                                                
    loop do                                                                                                                               
      yield @this                                                                                                                         
      @this, @next = @next, @this + @next                                                                                                 
    end                                                                                                                                   
  end                                                                                                                                     
end                                                                                                                                       
                                                                                                                                          
fib = Fibonacci.new                                                                                                                       
p fib.take(15) #=>  [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]

fizzbazz.rb

puts( (1..110).zip(                                                                                                                       
  (-2..0).cycle,                                                                                                                          
  (-4..0).cycle,                                                                                                                          
  (-6..0).cycle                                                                                                                           
).map do |number, foo, bar, baz|                                                                                                          
  [ number ] +                                                                                                                            
  %w{foo bar baz}.zip(                                                                                                                    
    [foo, bar, baz]).map do |blub, zero|                                                                                                  
    zero == 0 ? blub : nil                                                                                                                
  end.compact                                                                                                                             
end.map do |output|                                                                                                                       
  output.join("")                                                                                                                         
end.join("\n") )