afhswe / fizzbuzzwithoutconditionals

Fizz Buzz Kata Implementation Without Conditionals

This code demonstrates a possible Fizz Buzz Kata implementation without using if conditionals and instead working with dictionaries.

The code was implemented via TDD to initially produce the obvious solution using if statements and afterwards refactored step-by-step to remove all conditionals and replace them with setting up dictionaries for producing the result.

This solution of the Kata was only created to prove that it's possible to not use any conditional statements or loops to achieve the expected behaviour.

Considerations of clean code such as readability have been not been completely disregarded but were not put in focus ;-)

Note: the amount of data-driven test cases should usually of course not be necessary and are rather provided to demonstrate to the reader that the solution works ;-)

PS: the goal of the original Kata is to also produce a list of all numbers from 1 to 100. This part was intentionally skipped and is left to the readers imagination.

Excercise 1 - Make the code even simpler

Assuming that the requirements are set in stone and will not change, think of how this code could be simplified while still not using any conditionals or loops.

Excercise 2 - Make the code extensible

How could we make the code extensible so that you can easily define different or new words to be called for different numbers.

E.g. calling "Moo" if the number is divisible by 7 and calling "FizzBuzzMoo" if it is divisible by 3, 5 and 7.

To do so we shall follow the open closed principle so it should be able to set this up without modifying the inners of the FizzBuzz class.

Is it even possible to achieve this without conditionals? I don't know, let's find out 😉

Note: feel free to refactor from this code or start the solution from scratch. The tests will serve as a safety net to tell you when you went wrong.