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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

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Chapter 4. Data Structures

Ruby Chapter 4.
Data Structures

Using associative arrays

Creating and using hashes in Ruby is straightforward.