17 hours ago
- This article presents a modular FizzBuzz implementation using monoids in Haskell, combining guards and Maybe values.
- The key advantage is easy extensibility: adding a new rule (e.g., 'zork' for multiples of 7) requires only one new line of code, without altering other parts.
- The expression 'fizz' <$ guard (rem i 3 == 0) produces Just 'fizz' when divisible by 3, otherwise Nothing, and mconcat combines all such results.
- fromMaybe (show i) replaces Nothing with the number as a string, providing the final output for each number.
- This illustrates how generic interfaces like Monoid and Alternative enable modular design beyond just FizzBuzz, scaling to larger problems.