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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 3. Numbers

Ruby Chapter 3.
Numbers

Generating random numbers

Ruby provides several methods to generate random numbers, primarily via the Random class.

Rounding numbers isn’t new—humans have been doing it for centuries to make calculations easier or to work within the limits of their tools.

Ruby makes handling complex numbers a breeze.