Clojure Koans Walkthrough

1. Introduction
2. Lists
3. Vectors
4. Sets
5. Maps
6. Functions
7. Conditionals
8. Higher Order Functions
9. Runtime Polymorphism
10. Lazy Sequences
11. Sequence Comprehensions
12. Creating Functions
13. Recursion
14. Destructuring
15. Refs
16. Atoms
17. Macros
18. Datatypes
19. Java Interop
20. Partition

Recommended Books

• ← Vectors
• Maps →

4. Sets - Koans Walkthrough

This video covers the set data structure, which has a unique syntax available in Clojure.

Here is the 04_sets.clj source code:

(meditations
  "You can create a set in two ways"
  (= #{} (set __))

  "They are another important data structure in clojure"
  (= __ (count #{1 2 3}))

  "Remember that a set is a 'set'"
  (= __ (set '(1 1 2 2 3 3 4 4 5 5)))

  "You can ask clojure for the union of two sets"
  (= __ (clojure.set/union #{1 2 3 4} #{2 3 5}))

  "And also the intersection"
  (= __ (clojure.set/intersection #{1 2 3 4} #{2 3 5}))

  "But don't forget about the difference"
  (= __ (clojure.set/difference #{1 2 3 4 5} #{2 3 5})))