Evolutionary Fizz Buzz Kata

An evolutionary coding kata where the requirements are revealed incrementally.

Evolutionary TDD Kata

Make sure to reveal the requirements of the next version only after finishing the previous one.

Version 1 Requirements

Reveal

• Implement an API, driven by unit tests, that maps positive integers to strings according to the following rules:
  • If the number is divisible by 3, the API returns the word "Fizz" as result, otherwise the number itself as a string.
  • No modulo operator – imagine the language or platform does not support it (yet), or you haven't learned about it but need to solve the problem anyway.
  • Optional: If you're up for a challenge, implement the divisibility check using only bit shifting and addition/subtraction, no division and multiplication.

Version 2 Requirements

Reveal

• You have unlocked the modulo operator!
• As usual, multiples of 5 should now be mapped to "Buzz", multiples of both 3 and 5 to "FizzBuzz". In general, unless stated otherwise, we always want to combine the outputs of the individual divisors from small to large (e.g., FizzBuzz, not BuzzFizz).

Version 3 Requirements

Reveal

• Multiples of 7 should now be mapped to "Bizz" – except on Tuesdays, where we want to map it to "Tuez" instead.
  Note: We don't want to only be able to test it on Tuesdays, though!

Version 4 Requirements

Reveal

• Multiples of 11 become "Fuzz" – except on February 29th, where it becomes "Leapz" instead.
• The number 42 becomes "Univerz" – and no combinations are formed in case it is also a multiple.
• The number 420 is mapped to "Blaze", followed by the "regular" output for everything it is divisible by.

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© 2023 Raimund Krämer - Use with attribution.

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