jhamon

\documentclass[12pt]{article}
\usepackage{fullpage}
\usepackage{enumitem}
\usepackage{xhfill}
\usepackage[width=5.5in, height=9in]{geometry}
\pagestyle{empty}
\raggedbottom
\raggedright
\setlength{\tabcolsep}{0in}
\usepackage[colorlinks=true, urlcolor=red]{hyperref}

jhamon

PS1="\[\e[0;33;49m\]\n\W\[\e[0m\e[0;34;49m\] \$ \[\e[0m\]"

jhamon

require 'CMath'

URLSAFE_CHARS = '0123456789' +
  'abcdefghijklmnopqrstuvwxyz' +
    'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

def num_to_code(decimal_number, base=62)
  raise "Invalid base" unless (2..62).include?(base)
  raise ArgumentError unless decimal_number > 0

jhamon

class Cat < ActiveRecord::Base
  validates :name, exclusion: { in: %w(Garfield Sylvester Tom Felix),
    message: "No celebrity cat names allowed."}
    
  validates :hair_length, inclusion: { in: %w(long_hair short_hair hairless),
    message: "%{value} is not a valid hair length" }
    
  validates :age, numericality: { only_integer: true,
    message: "Only integer ages are allowed."
  

jhamon

class Object
  def self.new_attr_accessor(*attr_names)
    # Metaprogramming implementation of the
    # self.attr_accessor class method

    attr_names.each do |attr_name|
      define_method(attr_name) do
        instance_variable_get("@#{attr_name}")
      end

jhamon

class User
  # ... clipped for brevity

  def save
    # Create a new row in the users table
    if @id.nil?
      QuestionsDatabase.instance.execute(<<-SQL, @fname, @lname)
          INSERT INTO
            users (fname, lname)
          VALUES

jhamon

require 'sqlite3'
require 'singleton'

class QuestionsDatabase < SQLite3::Database
  include Singleton
  
  def initialize
    super "aafollowers.db"  # Our test db
    self.results_as_hash = true
    self.type_translation = true

jhamon

key_array = [1,2,3] # => [1, 2, 3]
value_array = [4,5,6] # => [4, 5, 6]
silly_hash = { key_array => value_array } # => {[1, 2, 3]=>[4, 5, 6]}
key_array.pop # => 3

# After mutating the key the hash is broken
silly_hash # => {[1, 2]=>[4, 5, 6]}
silly_hash[key_array] # => nil
silly_hash[[1,2]] # => nil

jhamon

# coding: utf-8
require 'colorize'

class King < Piece
  include SteppingPieces
 
  def move_dirs
   [[0, -1], [0, 1], [1, 0], [-1, 0], [-1, -1], [-1, 1], [1, -1], [1, 1]]
  end
 

jhamon

class King < Piece
  include SteppingPieces

  def move_dirs
   [[0, -1], [0, 1], [1, 0], [-1, 0], [-1, -1], [-1, 1], [1, -1], [1, 1]]
  end

  def mark
    return "♚".colorize(@color)
  end