1. 1. Introduction to Ruby
2. 2. Installing Ruby
   1. 2.1 Installing Ruby on Windows
   2. 2.2 Installing Ruby on Mac OS X
   3. 2.3 Installing Ruby on Linux
3. 3. Types in Ruby
   1. 3.1 Strings
   2. 3.2 Numbers
   3. 3.3 Collections
   4. 3.4 Ranges
   5. 3.5 Arrays
   6. 3.6 Hash
   7. 3.7 Variables
4. 4. Methods
5. 5. Classes
6. 6. Inheritance
7. 7. Access Control
8. 8. Modules
9. 9. Regular Expressions
10. 10. Control Structures
11. 11. Iterators