mhriess

def sumInts(a: Int, b: Int): Int =
  if (a > b) 0 else a + sumInts(a + 1, b)
  
def countChange(money: Int, couns: List[Int]): Int = {
  if (money == 0) 1
  else if (money < 0) 0
  else if (coins.isEmpty && money >= 1) 0
  else { 
    countChange(money, coins.tail) + countChange(money - coins.head, coins)
  }

mhriess

Using jQuery

jQuery has become the most popular JavaScript library both inside and outside the Rails community. Let's look at how to take advantage of the library with our applications.

Setup

The setup process differs depending on whether your app is running on a version of Rails before 3.1 or greater than 3.1.

Before Rails 3.1: jquery-rails

mhriess

Friendly URLs

By default, Rails applications build URLs based on the primary key -- the id column from the database. Imagine we have a Person model and associated controller. We have a person record for Bob Martin that has id number 6. The URL for his show page would be:

/people/6

But, for aesthetic or SEO purposes, we want Bob's name in the URL. The last segment, the 6 here, is called the "slug". Let's look at a few ways to implement better slugs.

mhriess

class Session

  attr_reader :output_stream

  def initialize(game, input_stream = $stdin, output_stream = $stdout)
    @game = game
    @input_stream = input_stream
    @output_stream = output_stream
  end

mhriess

require 'simplecov'
SimpleCov.start
require './binary_search.rb'


describe "#binary_search" do
  let(:array_1) { [1,2,3,4,5,6,7] }
  let(:array_2) { ["apple", "pear", "banana", "pineapple", "kiwi"].sort}
  
  it "is defined as a method" do

mhriess

require 'csv'
require 'term/ansicolor'

# Use this trick to work around namespace cluttering that
# happens if you just include Term::ANSIColor:

class Color
  extend Term::ANSIColor
end

mhriess

CHOICES = ["Rock", "Paper", "Scissors"]

def new_game
  print %q"Let's play some Rock-Paper-Scissors!
  Enter your choice below:
  >"
  
  outcome
end

mhriess

CHOICES = ["Rock", "Paper", "Scissors"]

def player_choice
  print "Enter your choice below:
  >"

  player_input = gets.chomp.capitalize

  CHOICES.include?(player_input) ? player_input : player_choice
end

mhriess

Script: ROCK - PAPER - SCISSOR Iteration One: COMPUTERS HANDSIGN

RETURN a random hand sign (Rock-Paper-Scissor)

Iteration Two: CHECK WHO WON

IF COMPUTERS HANDSIGN beats PLAYERS HANDSIGN RETURN "You loose" ELSIF PLAYERS HANDSIGN beats COMPUTERS HANDSIGN RETURN "You win" ELSE RETURN "Draw" ENDIF

Iteration Three: GET A HANDSIGN OF A PLAYER

mhriess

#  Put your answers here!

Michael-Riess-Computer:sample_project michaelriess$ rvm list

rvm rubies

   ruby-1.8.7-p302 [ i686 ]
   ruby-1.9.2-p290 [ x86_64 ]
 * ruby-1.9.2-p318 [ x86_64 ]
   ruby-1.9.2-p320 [ x86_64 ]