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intersection_set _ [] = []
intersection_set [] _ = []
intersection_set (x:xs) ys
     | element_of_set x ys = x : intersection_set xs ys
     | otherwise = intersection_set xs ys

element_of_set _ [] = False
element_of_set x (y:ys)
   | x == y = True
   | otherwise = element_of_set x ys

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EXERCISE 1/2 are earlier versions of ex 3

EXERCISE 3.

select  books.title, stock.retail, stock.stock, books.id AS BOOK_ID, editions.isbn, editions.publisher_id from books  left join editions  on books.id = editions.book_id left join stock on stock.isbn = editions.isbn where editions.publisher_id = 59;

EXERCISE 4.

 select  books.title, stock.retail, stock.stock, books.id AS BOOK_ID, editions.isbn, editions.publisher_id from books  left join editions  on books.id = editions.book_id left join stock on stock.isbn = editions.isbn where editions.publisher_id = 59 and stock.stock > 0;

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require 'rspec'

module Flight
  def fly
    puts "I am a #{self.class} and I am flying"
  end
end

class Animal
  def warm_blooded?

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### SETUP
require 'rspec'

RSpec.configure do |config|
  config.color = true
end

### LOGIC (fix me)

# Returns the average of all the numbers in the array

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def benchmark
  # Your benchmarking code goes here.
  beginning_time = Time.now
  foo = yield
  end_time = Time.now
  return end_time - beginning_time
end
 
# Be careful, pasting this into IRB will take a long time to print.
# It's a loooong string. :)

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# Save this file to your computer so you can run it 
# via the command line (Terminal) like so:
#   $ ruby shakil_the_dog.rb
#
# Your method should wait for user input, which corresponds
# to you saying something to your dog (named Shakil).
 
# You'll probably want to write other methods, but this 
# encapsulates the core dog logic

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# Save this file to your computer so you can run it 
# via the command line (Terminal) like so:
#   $ ruby shakil_the_dog.rb
#
# Your method should wait for user input, which corresponds
# to you saying something to your dog (named Shakil).
 
# You'll probably want to write other methods, but this 
# encapsulates the core dog logic
def shakil_the_dog