Discussion on: [Challenge] 🐝 FizzBuzz without if/else

Oh it isn’t that hard, it might seem complicated because of all the parenthesis and strange keywords like cons, but it’s actually just a matter of getting used to it. It’s a fun language to learn recursion for example.

It becomes a lot simpler when you learn the patterns for building recursive functions, at one point, you don’t even look at the whole function because you just think of the parts.

I started by making a function that looks like that:

#lang r5rs

(define (fizzbuzz n acc)
  (define (compute n)
    n)
  (if (zero? n)
      acc
      (fizzbuzz (- n 1)
                (cons (compute n)
                      acc))))

(display (fizzbuzz 15 '()))
(newline)
; => (1 2 3 4 5 6 7 8 9 10 11 12 13 14 15)

This function just returns the list of numbers from 1 to 15, that's what it does because the compute function just returns whatever is n. Then I simply filled compute with my conditions.

• define is used to define variables and functions,
• cons is used to build a list from a head and a queue (that's not hard to understand but it definetely requires some practice and research,
• let* allows to define local variables