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# Fizz Buzz
# Print the numbers from 1 to 100
# If a number is divisible by 3 print "Fizz" instead
# If a number is divisible by 5 print "Buzz" instead
# If a number is divisible by 3 and 5 print "FizzBuzz" instead
# Sample output 
# 1
# 2
# Fizz
# 4

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# write a recursive function that brings back a factorial
# 
# How does factorial work:
# 0! = 1 #=> 1
# 1! = 1 #=> 1
# 2! = 2 * 1 #=> 2
# 3! = 3 * 2 * 1 #=> 6
# 4! = 4 * 3 * 2 * 1 #=> 24
# 5! = 5 * 4 * 3 * 2 * 1 #=> 120

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# Write a url shortener application in Rails.

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# Write a url shortener application in Rails.

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# How would you write an erb file that produces exactly the following output
<articles>
  <article>Title</article>
  <article>Title</article>
  <article class=”high”>Title</article>
  <article>Title</article>
  <article>Title</article>
  <article class=”high”>Title</article>
  <article>Title</article>
  <article>Title</article>

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# Given the following hash
h = {a: 1, b1: {b2: {b3: nil}, c2: nil}, c1: {c2: {c3: nil}}}
# Write a function that prints out all the keys

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# Given the following array:
# assume ruby 1.9+
array = [1,2,3,4,5,6,7,8,9,10]
# You want to print them out like so
# [first, last]
# [first, rest]
# [first, rest minus last, last]

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# There are 2 robots placed on an infinitely wide 2 dimensional line.
# The robots can’t see each other.
# Each robot has 1 marker to the right but 1 of them doesn’t have one on the left.
# - unit of distance
# ^ marker
# ~ indefinite amount of units of distance
# ---~---(Robot)---~---^---~---(Robot)---~--^---~---

# Write a program that will make that 2 robots collide using the following Robot Api:
# move_left(n)

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require 'open-uri'
require 'json'


def get(key)
  lambda { |s| s[key].empty? ? nil : s[key] }
end


# ["title", "abstract", "name", "bio", "starts_at", "ends_at", "category", "room"] 

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class PaymentProxy
  def initialize(gateway)
    @gateway = gateway
    @observers = []
  end

  def register_observer(o)
    # ...
  end