| 1. | Create set with Set.new | | |
| 2. | Create set with constant values | | |
| 3. | Is it in a set | | |
| 4. | Is it a subset | | |
| 5. | Set length, size and empty? | | |
| 6. | The intersection is the set of values that appear in both | | |
| 7. | The union is the set of values that appear in either | | |
| 8. | a-b: is the elements of a except for those also in b | | |
| 9. | a^b is the set of values that appear in one set but not both: (a|b)-(a&b) | | |
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| 10. | Add element to a set | | |
| 11. | merge a range to a set | | |
| 12. | Remove elements from a set | | |
| 13. | Set subtraction | | |
| 14. | Delete elements from a set with block | | |
| 15. | Reject elements from a set | | |
| 16. | Do an in-place intersection like this: | | |
| 17. | Replace a set | | |
| 18. | Clear a set | | |
| 19. | Is it empty | | |
| 20. | Each loop | | |
| 21. | Map elements in a set | | |
| 22. | Collect in place | | |
| 23. | Convert set to array | | |
| 24. | Inspect a set | | |
| 25. | Compare two sets | | |
| 26. | Classify set elements as even or odd | | |
| 27. | Divide set | | |
| 28. | Divide with block | | |
| 29. | Flatten the subsets | | |
| 30. | Add new method to set | | |
| 31. | Partitioning or Classifying a Set | | |
| 32. | Divide a set by value | | |
| 33. | Divide a set by even and odd value | | |
| 34. | Divide a set by its element's class | | |
| 35. | Divide a set by absolute value | | |
| 36. | Divide set into three sub sets | | |
| 37. | Classify a set into three | | |
| 38. | Convert a hash to set and divide | | |
| 39. | Add set operation to Array | | |
| 40. | Sort with block | | |
| 41. | Set includes and membership | | |