Strings Objects Variables

Chapter 3 Working with Objects, Strings, and Variables Ruby Programming

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Objectives Ruby Programming 3-

Project Preview: The Ruby Virtual Crazy 8 Ball Game Ruby Programming 3-

The Ruby Virtual Crazy 8 Ball Game (continued) ,[object Object],Ruby Programming 3- Figure 3-1 The welcome screen for the Ruby Virtual Crazy 8-Ball game.

The Ruby Virtual Crazy 8 Ball Game (continued) ,[object Object],Ruby Programming 3- Figure 3-2 The game requires the player to agree to play.

The Ruby Virtual Crazy 8 Ball Game (continued) ,[object Object],Ruby Programming 3- Figure 3-3 The game invites the player to return and play again.

The Ruby Virtual Crazy 8 Ball Game (continued) ,[object Object],Ruby Programming 3- Figure 3-4 The game prompts the player to ask it a question.

The Ruby Virtual Crazy 8 Ball Game (continued) ,[object Object],Ruby Programming 3- Figure 3-5 The game provides a randomly selected answer to the player’s question .

The Ruby Virtual Crazy 8 Ball Game (continued) ,[object Object],Ruby Programming 3- Figure 3-6 The player has the option of asking another question or typing q to quit the game.

The Ruby Virtual Crazy 8 Ball Game (continued) ,[object Object],Ruby Programming 3- Figure 3-7 The Ruby Virtual Crazy 8-Ball game has ended.

Creating and Formatting Text Strings Ruby Programming 3-

Modifying Text String Format ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Modifying Text String Format (continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

String Interpolation ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Manipulating String Contents Ruby Programming 3-

Concatenating Text Strings ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Multiplying Text Strings ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Comparing Text Strings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Creating Multiline Text Strings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Working with String Class Methods Ruby Programming 3-

String Class Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Object-Oriented Programming Ruby Programming 3-

Defining a New Class ,[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Defining Class Properties ,[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Instantiating and Interacting with New Objects ,[object Object],[object Object],Ruby Programming 3-

Defining Class Methods ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Inheritance (continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Converting from One Class to Another Ruby Programming 3-

Implicit Class Conversion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Explicit Class Conversion ,[object Object],[object Object],Ruby Programming 3-

Storing and Retrieving Data Ruby Programming 3-

Naming Variables ,[object Object],[object Object],[object Object],Ruby Programming 3-

Variable Assignments ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Variable Scope ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Storing Data That Does Not Change Ruby Programming 3-

Constants ,[object Object],[object Object],[object Object],Ruby Programming 3-

Back to the Ruby Virtual Crazy 8 Ball Game Ruby Programming 3-

Designing the Game ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 1: Creating a New Ruby File ,[object Object],[object Object],Ruby Programming 3-

Step 2: Documenting the Script and Its Purpose ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 3: Defining a Screen Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 4: Defining a Ball Class ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 4: Defining a Ball Class (continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 4: Defining a Ball Class (continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 4: Defining a Ball Class (continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 5: Instantiating New Objects ,[object Object],[object Object],[object Object],Ruby Programming 3-

Step 6: Greeting the Player ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 7: Prompting for Confirmation to Continue ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 8: Analyzing the Player’s Response ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 9: Managing Early Termination of the Game ,[object Object],[object Object],[object Object],Ruby Programming 3-

Step 10: Responding to Player Questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 10: Responding to Player Questions (continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Step 10: Responding to Player Questions (continued) ,[object Object],[object Object],[object Object],Ruby Programming 3-

Running Your New Ruby Script Game ,[object Object],[object Object],[object Object],[object Object],Ruby Programming 3-

Summary Ruby Programming 3- ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Strings Objects Variables

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Strings Objects Variables