1. Introduction
3. Prototype
4. 1. Prototyping
5. 2. Blocks
6. 1. 2.1. key
   2. 2.2. pad
   3. 2.3. display
   4. 2.4. calculator
   5. 2.5. attribution
   6. 2.6. page
8. HTML/CSS to Elm
9. 3. Translating
10. 4. Views
11. 1. 4.1. View.Key
    2. 4.2. View.Pad
    3. 4.3. View.Display
    4. 4.4. View.Calculator
    5. 4.5. View.Attribution
    6. 4.6. View.Page
12. 5. Reflections on the UI
14. Application Logic
15. 6. Domain Modeling
16. 7. Rational Numbers
17. 1. 7.1. Representation
    2. 7.2. Constructors
    3. 7.3. Arithmetic
    4. 7.4. Conversion
    5. 7.5. Unit Tests
18. 8. Evaluating Infix Expressions
19. 1. 8.1. Stack
    2. 8.2. Dijkstra's Shunting Yard Algorithm
    3. 8.3. Unit Tests
20. 9. Calculator
21. 1. 9.1. Tokenizing Input
    2. 9.2. Displaying Output
    3. 9.3. Unit Tests
23. Putting It All Together
24. 10. UI + Application Logic
27. Conclusion