Fizzbuzz in Rust

fizzbuzz.rs

#![feature(generators)]
#![feature(generator_trait)]

use std::ops::{Generator, GeneratorState};

fn fizzbuzz_println(upto: u64) {
	for i in 0..upto {
		if i % 3 == 0 && i % 5 == 0 {
			println!("FizzBuzz");
		} else if i % 3 == 0 {
			println!("Fizz");
		} else if i % 5 == 0 {
			println!("Buzz");
		} else {
			println!("{}", i);
		}
	}
}

fn fizzbuzz_ifelse(upto: u64) -> Vec<String> {
	let mut result: Vec<String> = Vec::new();
	for i in 0..upto {
		if i % 3 == 0 && i % 5 == 0 {
			result.push("FizzBuzz".into());
		} else if i % 3 == 0 {
			result.push("Fizz".into());
		} else if i % 5 == 0 {
			result.push("Buzz".into());
		} else {
			result.push(i.to_string());
		}
	}
	result
}

fn fizzbuzz_vec(upto: u64) -> Vec<String> {
	let mut result: Vec<String> = Vec::new();
	for i in 0..upto {
		result.push(match (i % 3, i % 5) {
			(0, 0) => "FizzBuzz".into(),
			(0, _) => "Fizz".into(),
			(_, 0) => "Buzz".into(),
			(_, _) => i.to_string(),
		})
	}
	result
}

fn main() {
	let fizzbuzz = |upto: u64| {
		move || for i in 0..upto {
			yield match (i % 3, i % 5) {
				(0, 0) => "FizzBuzz".into(),
				(0, _) => "Fizz".into(),
				(_, 0) => "Buzz".into(),
				(_, _) => i.to_string(),
			}
		}
	};

	let mut output = fizzbuzz(100);
	loop {
		match output.resume() {
			GeneratorState::Yielded(x) => println!("{}", x),
			GeneratorState::Complete(()) => break,
		}
	}
}