Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Swift Collections and Control Flow Control Flow With Conditional Statements FizzBuzz Challenge

Posted by Mike Chael
Mike Chael
2,111 Points

How to do FizzBuzz Challenge with Switch Control Flow

Is it possible to solve the FizzBuzz challenge using switch? I attached my attempt below.

I tried several things like switching the "n" type to Bool, Int, and even Any - none worked.

fizzBuzz.swift 
func fizzBuzz(n:Bool) -> String {
  // Enter your code between the two comment markers
switch n {
  case n % 3 == 0: return "Fizz"
  case n % 5 == 0: return "Buzz"
  case n % 3 == 0 && n % 5 == 0: return "FizzBuzz"
   case n % 3 != 0 && n % 5 != 0: return n
  }
  // End code
  return "\(n)"
}

1 Answer

Steven Parker
Steven Parker
231,184 Points
Steven Parker
Steven Parker
231,184 Points

First, your code should only go between the comments, in particular you should not change the type of "n".

And a "switch" only matches values to it's argument, it doesn't perform logical tests on the "case" expressions. But you can still do this with a switch by creating a value that can be compared with:

func fizzBuzz(n: Int) -> String {
  // Enter your code between the two comment markers
  var fb = 0
  if (n % 3 == 0) { fb += 1 }
  if (n % 5 == 0) { fb += 2 }
  switch fb {
    case 1: return "Fizz"
    case 2: return "Buzz"
    case 3: return "FizzBuzz"
    default: break
  }
  // End code
  return "\(n)"
}