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#! ruby19

require 'date'

class EndlessEnum
  include Enumerable

  def initialize(x, method = :succ)
    @x = x
    @method = method

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require 'yaml'

Track = Struct.new :title, :duration

# An Album represents an audio medium which has title,
# interpret, a pause duration between tracks and a list
# of individual tracks.
class Album
  attr_reader :title, :interpret, :pause

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# By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6^(th) prime is 13.
# 
# What is the 10001^(st) prime number?

require 'mathn'
puts Prime.instance.each.tap{ |x| 10000.times{ x.next} }.next  #104743

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include Enumerable
def each
  return Enumerator.new(self,:each) unless block_given?
  yield 1
  yield 2  
end
puts each.inject(:+).inspect
puts each{|x| x * x}.inject(:+).inspect

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[12,3,4,5].map{|x| x * 2}.inspect

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:foo / :bar           # => [:foo, :bar]
:foo / :bar / :fizz   # => [:foo, :bar, :fizz]
:foo / :bar / :foo    # => [:foo, :bar]
:foo / :bar / :fizz / :bizz   # => [:foo, :bar, :fizz, :bizz]