[conspire] FizzBuzz as fast as possible

[Deirdre Saoirse Moen]

For those who don't know FizzBuzz, you output "Fizz" for multiples of 3, "Buzz" for multiples of 5, and "FizzBuzz for multiples of 15, otherwise the current number.

It's a basic test of loop knowledge and how to divide a problem that I've had used in interviews. Surprisingly, a lot of people fail it.

Over on codegolf, there's someone who's written an assembly language version optimized to run as fast as possible.

https://codegolf.stackexchange.com/a/236630


There are typically two basic approaches:

1. three separate cases plus a default
2. string concatenation, which only requires two cases, plus a default

Most people do variant 1, but I think variant 2 is often better future-proofed (in case you wanted to add a 7 multiple in there, in which case #1 now has 6 cases and the #2 only has 3).

I'm more interested in some of the more subtle aspects of it, like: can you show off the idioms of the language in question?

One of the Swift idioms that's kind of fun with FizzBuzz is showing off the _ variable (basically: DGAF what's stored there) and the ability to switch on multiple conditions at the same time.

for i in 1...100
{
    switch (i % 3, i % 5)
    {
    case (0, 0):
        print("FizzBuzz")
    case (0, _):
        print("Fizz")
    case (_, 0):
        print("Buzz")
    default:
        print(i)
    }
}

Speaking of idioms, I keep meaning to get around to a Swift async/await version of dining philosophers, but haven't yet. 

-- 
  Deirdre Saoirse Moen
  deirdre at deirdre.net