Learn Ruby the Hard Way

Questions 58 Exercise 17: More Files 60 What You Should See 60 Study Drills 61 Common Student Questions 61 Exercise 18: Names, Variables, Code, Functions 62 What You Should See 63 Study Drills 64 Common Student Questions 65 Exercise 19: Functions and Variables 66 What You Should See 67 Study Drills 67 Common Student Questions 67 Exercise 20: Functions and Files 70 What You Should See 71 Study Drills 71 Common Student Questions 71 Exercise 21: Functions Can Return Something 74 What You Should See 75 Study Drills 75 Common Student Questions 76 Exercise 22: What Do You Know So Far? 78 What You Are Learning 78 Exercise 23: Read Some Code 80 Exercise 24: More Practice 82 What You Should See 83 Study Drills 83 Common Student Questions 83 Exercise 25: Even More Practice 84 What You Should See 85 Study Drills 87 Common Student Questions 87 Exercise 26: Congratulations, Take a Test! 88 Common Student Questions 88 Exercise 27: Memorizing Logic 90 The Truth Terms 90 The Truth Tables 91 Common Student Question 92 Exercise 28: Boolean Practice 94 What You Should See 96 Study Drills 96 Common Student Questions 96 Exercise 29: What If 98 What You Should See 99 Study Drills 99 Common Student Question 99 Exercise 30: Else and If 100 What You Should See 101 Study Drills 101 Common Student Question 101 Exercise 31: Making Decisions 102 What You Should See 103 Study Drills 103 Common Student Questions 103 Exercise 32: Loops and Arrays 106 What You Should See 108 Study Drills 108 Common Student Questions 108 Exercise 33: While Loops 110 What You Should See 111 Study Drills 112 Common Student Questions 112 Exercise 34: Accessing Elements of Arrays 114 Study Drills 115 Exercise 35: Branches and Functions 116 What You Should See 118 Study Drills 118 Common Student Questions 118 Exercise 36: Designing and Debugging 120 Rules for If-Statements 120 Rules for Loops 120 Tips for Debugging 121 Homework 121 Exercise 37: Symbol Review 122 Keywords 122 Data Types 124 String Escape Sequences 124 Operators 125 Reading Code 126 Study Drills 126 Common Student Question 127 Exercise 38: Doing Things to Arrays 128 What You Should See 129 What Arrays Can Do 129 When to Use Arrays 130 Study Drills 131 Common Student Questions 131 Exercise 39: Hashes, Oh Lovely Hashes 132 A Hash Example 133 What You Should See 135 What Hashes Can Do 136 Making Your Own Hash Module 136 The Code Description 140 Three Levels of Arrays 142 What You Should See (Again) 142 When to Use Hashes or Arrays 143 Study Drills 143 Common Student Questions 144 Exercise 40: Modules, Classes, and Objects 146 Modules Are Like Hashes 146 What You Should See 151 Study Drills 151 Common Student Question 151 Exercise 41: Learning to Speak Object Oriented 152 Word Drills 152 Phrase Drills 152 Combined Drills 153 A Reading Test 153 Practice English to Code 156 Reading More Code 156 Common Student Questions 156 Exercise 42: Is-A, Has-A, Objects, and Classes 158 How This Looks in Code 159 Study Drills 161 Common Student Questions 161 Exercise 43: Basic Object-Oriented Analysis and Design 164 The Analysis of a Simple Game Engine 165 Top Down Versus Bottom Up 170 The Code for "Gothons from Planet Percal #25" 170 What You Should See 176 Study Drills 177 Common Student Question 177 Exercise 44: Inheritance Versus Composition 178 What Is Inheritance? 178 Composition 183 When to Use Inheritance or Composition 185 Study Drills 186 Common Student Questions 186 Exercise 45: You Make a Game 188 Evaluating Your Game 188 Function Style 189 Class Style 189 Code Style 190 Good Comments 190 Evaluate Your Game 191 Exercise 46: A Project Skeleton 192 Creating the Skeleton Project Directory 192 Testing Your Setup 195 Using the Skeleton 195 Required Quiz 195 Common Student Questions 196 Exercise 47: Automated Testing 198 Writing a Test Case 198 Testing Guidelines 201 What You Should See 201 Study Drills 202 Common Student Questions 202 Exercise 48: Advanced User Input 204 Our Game Lexicon 204 A Test First Challenge 206 What You Should Test 207 Study Drills 209 Common Student Questions 210 Exercise 49: Making Sentences 212 Match and Peek 212 The Sentence Grammar 213 A Word on Exceptions 213 The Parser Code 213 Playing with the Parser 216 What You Should Test 217 Study Drills 217 Common Student Question 217 Exercise 50: Your First Website 218 Installing Sinatra 218 Make a Simple "Hello World" Project 219 What's Happening Here? 220 Stopping and Reloading Sinatra 221 Fixing Errors 221 Create Basic Templates 222 Study Drills 223 Common Student Questions 223 Exercise 51: Getting Input from a Browser 224 How the Web Works 224 How Forms Work 226 Creating HTML Forms 227 Creating a Layout Template 228 Writing Automated Tests for Forms 229 Study Drills 230 Common Student Question 231 Exercise 52: The Start of Your Web Game 232 Refactoring the Exercise 43 Game 232 Sessions and Tracking Users 237 Creating an Engine 238 Your Final Exam 240 Next Steps 242 How to Learn Any Programming Language 243 Advice from an Old Programmer 246 Appendix: Command Line Crash Course 249 Introduction: Shut Up and Shell 249 The Setup 251 Paths, Folders, and Directories (pwd) 254 If You Get Lost 256 Make a Directory (mkdir) 257 Change Directory (cd) 260 List Directory (ls) 264 Remove Directory (rmdir) 269 Moving Around (pushd, popd) 273 Making Empty Files (Touch, New-Item) 276 Copy a File (cp) 277 Moving a File (mv) 281 View a File (less, MORE) 283 Stream a File (cat) 285 Removing a File (rm) 286 Exiting Your Terminal (exit) 289 Command Line Next Steps 290 Index 291