Pedantic FizzBuzz implementation in Rust

fizzbuzz.rs

use std::fmt;

enum FizzBuzzOr {
    Fizzbuzz(&'static str),
    Or(i32)
}

impl fmt::Display for FizzBuzzOr {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        use FizzBuzzOr::*;
        match self {
            Fizzbuzz(a) => write!(f, "{}", a),
            Or(i) => write!(f, "{}", i)
        }
    }
}

fn fizzbuzz(i: i32) -> FizzBuzzOr {
    match (i % 3, i % 5) {
        // The order is important; the more precise definitions 
        // must come before those that use wildcards, or the 
        // wildcarded definitions will pick up incorrect
        // answers.
        
        (0, 0) => FizzBuzzOr::Fizzbuzz("fizzbuzz"),
        (0, _) => FizzBuzzOr::Fizzbuzz("fizz"),
        (_, 0) => FizzBuzzOr::Fizzbuzz("buzz"),
        (_, _) => FizzBuzzOr::Or(i),
    }
}

fn main() {
    for i in 1 .. 100 {
        println!("{}", fizzbuzz(i));
    }
}

This was an awesome learning experience; Thank you!

You're welcome!

…

On Wed, Oct 16, 2019 at 1:37 PM Vale the Violet Mote < ***@***.***> wrote: This was an awesome learning experience; Thank you! — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://gist.github.com/4757b918d034e5a1820704af6b94d82d?email_source=notifications&email_token=AAA37ZGSJXK6VPTI65KXS5DQO53QRA5CNFSM4JBQYQAKYY3PNVWWK3TUL52HS4DFVNDWS43UINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAF2TQY#gistcomment-3057420>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAA37ZFH5PLUNUYFMLMHJWDQO53QRANCNFSM4JBQYQAA> .

Neat use of match but

https://www.snoyman.com/blog/2018/10/rust-crash-course-01-kick-the-tires

says to “Print the numbers 1 to 100” whereas this code only does 1 to 99. You need “1 .. 101” or “1 ..= 100”.