pragdave

# encoding: utf-8

input = [ 1, 2, 3, 4, 5, 8, 9, 11, 12, 13, 15 ]

# Need to box the value to make it mutable
State = Struct.new(:last_value)
                                          
# divide the input into runs of consecutive numbers
s = input.slice_before(State.new(input.first)) do |value, state|
  (_, state.last_value = value != state.last_value.succ, value)[0]

pragdave

Stephenson, G. R. (1967). Cultural acquisition of a specific learned response among rhesus monkeys. In: Starek,
 D., Schneider, R., and Kuhn, H. J. (eds.), Progress in Primatology, Stuttgart: Fischer, pp. 279-288.

mentioned in: Galef, B. G., Jr. (1976). Social Transmission of Acquired Behavior: A Discussion of Tradition and
Social Learning in Vertebrates. In: Rosenblatt, J.S., Hinde, R.A., Shaw, E. and Beer, C. (eds.), Advances in the
study of behavior, Vol. 6, New York: Academic Press, pp. 87-88:


[...] Stephenson (1967) trained adult male and female rhesus monkeys to avoid manipulating an object and then 
placed individual naïve animals in a cage with a trained individual of the same age and sex and the object in 

pragdave

Stephenson, G. R. (1967). Cultural acquisition of a specific learned response among rhesus monkeys. In: Starek, D., Schneider, R., and Kuhn, H. J. (eds.), Progress in Primatology, Stuttgart: Fischer, pp. 279-288.

mentioned in: Galef, B. G., Jr. (1976). Social Transmission of Acquired Behavior: A Discussion of Tradition and Social Learning in Vertebrates. In: Rosenblatt, J.S., Hinde, R.A., Shaw, E. and Beer, C. (eds.), Advances in the study of behavior, Vol. 6, New York: Academic Press, pp. 87-88:

[...] Stephenson (1967) trained adult male and female rhesus monkeys to avoid manipulating an object and then placed individual naïve animals in a cage with a trained individual of the same age and sex and the object in question. In on case, a trained male actually pulled his naïve partner away from the previously punished manipulandum during their period of interaction, whereas the other two trained males exhibited what were described as "threat facial expressions while in a fear posture" when a naïve animal appro

pragdave

  validates :title, :description, :image_url, :presence => true 
  validates :price, :numericality => { :greater_than => 0 }
  validates :title, :uniqueness => true
  validates :image_url, 
            :format => { :with  => %r{\.(gif|jpg|png)$}i, 
                         :message => 'must be a URL for GIF, JPG or PNG image.' }

pragdave

  validates_presence_of     :title, :description, :image_url
  validates_numericality_of :price, :greater_than => 0 
  validates_uniqueness_of   :title
  validates_format_of       :image_url, 
                            :with => %r{\.(gif|jpg|png)$}i, 
                            :message => 'must be a URL for GIF, JPG or PNG image.'

pragdave

Card = Struct.new(:rank, :suit)
dealer = Fiber.new do
  ranks = (1..13).to_a
  suits = [:club, :diamond, :heart, :spade]
  pack = ranks.product(suits).map {|card| Card.new(*card)}
  all_cards = pack*7
  cards = []
  loop do
    cards = all_cards.shuffle if cards.size < 2*52
    Fiber.yield cards.pop