1. Ruby Cold Cuts
Part II
Enumerating Enumerable
INTO DARKNESS

2. Review

3. • Idiomatic Ruby for Iterating / Looping
• Part of the Ruby Core
• Written in C (very fast)
• Includes many methods to help in development
• Is a module
Enumerable

4. Modules
• Composition
• Built into the Ancestor Tree
• Methods defined in module are available to classes

5. More Enumerable

6. #inject

7. #inject

8. #inject

9. #inject

10. #inject

11. #grep

12. #take_while

13. Hash
Array
Set

14. Implementing Enumerable
• Include Enumerable
• Define Each
• Yield or Delegate
• Optionally Define <=>

15. Internal Iterator

16. Self Iterator

17. Demo

18. Thank You