-  Preface
- Part I. Getting Started
- 1. Diving into Crystal
- A Programming Language for Humans and Computers
- Slick As Ruby, But Way Faster
- Almost As Fast As C
- Speeding Up the Web
- Talking to Databases
- More Safety Through Types
- No to the Billion-Dollar Mistake
- Batteries Included
- Putting Crystal to Good Use
- A Company’s Story Crystallized: Red Panthers
- Wrapping Up
- 2. Crystal Foundations
- 1. Diving into Crystal
- Part II. Building Blocks
- 3. Typing Variables and Controlling the Flow
- Converting Data Between Types
- Getting Input
- Putting It Together—Converting Currencies 1
- Exception Handling for Faulty Input
- Chaining Methods
- Getting Input from Command-Line Arguments
- Using String Methods
- Using Symbols as Identifiers
- Using Enums
- Using Regular Expressions
- Putting It Together—Converting Currencies 2
- Beyond Hashes and Arrays: More Composite Types
- Nilable Types
- Controlling the Flow and Types
- A Company’s Story Crystallized: Linkfeed
- Wrapping Up
- 4. Organizing Code in Methods and Procs
- 5. Using Classes and Structs
- 6. Working with Modules
- 7. Managing Projects
- 3. Typing Variables and Controlling the Flow
- Part III. Advanced Crystal
- Part IV. Appendices
- A1. Setting Up a Crystal Environment
- A2. Porting Ruby Code to Crystal
- A3. Your Turn Answers
- Chapter 2: Crystal Foundations
- Chapter 3: Typing Variables and Controlling the Flow
- Chapter 4: Organizing Code in Methods and Procs
- Chapter 5: Using Classes and Structs
- Chapter 6: Working with Modules
- Chapter 7: Managing Projects
- Chapter 8: Advanced Features
- Chapter 9: Web Frameworks and the Shard Ecosystem
- Appendix 1: Setting Up a Crystal Environment
Chapter 8: Advanced Features
Your Turn 1
def_method.cr
Your Turn 2
a. main_fiber3.cr
b. main_fiber4.cr
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