Part 1 Ruby foundations

• Chapter 1 Bootstrapping your Ruby literacy
• Chapter 2 Objects, methods, and local variables
• Chapter 3 Organizing objects with classes
• Chapter 4 Modules and program organization
• Chapter 5 The default object (self), scope, and visibility
• Chapter 6 Control-flow techniques

Part 2 Built-in classes and modules

• Chapter 7 Built-in essentials
• Chapter 8 Strings, symbols, and other scalar objects
• Chapter 9 Collection and container objects
• Chapter 10 Collections central: Enumerable and Enumerator
• Chapter 11 Regular expressions and regexp-based string operations
• Chapter 12 File, I/O, and system operations

Part 3 Ruby dynamics

• Chapter 13 Object individuation
• Chapter 14 Callable and runnable objects
• Chapter 15 Callbacks, hooks, and runtime introspection