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Chapter 2. Strings
Chapter 3. Numbers
Chapter 4. Data Structures
- Using associative arrays
Chapter 5. Good Coding Practices
Chapter 6. Files and I/O
Chapter 7. Dates and Times
Chapter 8. Data and Text Processing
- Manipulating files with CLI one-liners
- Editing files in-place with CLI one-liners
Chapter 9. Testing and Debugging
Chapter 10. Data Formats and Serialization
Chapter 11. HTML and the Web

Chapter 2. Strings
Chapter 3. Numbers
Chapter 4. Data Structures
- Using associative arrays
Chapter 5. Good Coding Practices
Chapter 6. Files and I/O
Chapter 7. Dates and Times
Chapter 8. Data and Text Processing
- Manipulating files with CLI one-liners
- Editing files in-place with CLI one-liners
Chapter 9. Testing and Debugging
Chapter 10. Data Formats and Serialization
Chapter 11. HTML and the Web

Chapter 9. Testing and Debugging

Ruby Chapter 9.
Testing and Debugging

Printing debug output

In Ruby, puts and p are your go-to methods for quick output to the console.

Ruby’s REPL is called IRB (Interactive Ruby).

Ruby comes with a built-in library called Test::Unit for writing unit tests, encapsulating testing practices within straightforward structures.