rustfizzbuzz.rs

// #![feature(proc_macro_hygiene, decl_macro)]

// #[macro_use]
// extern crate rocket;

// #[get("/hello/<name>/<age>")]
// fn hello(name: String, age: u8) -> String {
//     format!("Hello, {} year old named {}!", age, name)
// }

// fn main() {
//     rocket::ignite().mount("/", routes![hello]).launch();
// }

fn main() {
    let out1 = fizz(1);
    let out2 = looop2(15);
    println!("Fizz {:?}", out2);

    println!("{}", apply(add_one, 2))
}

fn add_one(i: u32) -> u32 {
    i + 1
}

// fn apply<A, B>(f: Fn(A) -> B, a: A) -> B {
fn apply<F, A, B>(f: F, a: A) -> B
where
    F: Fn(A) -> B,
{
    f(a)
}

fn looop2(end: u32) -> Vec<String> {
    (1..=end).map(|i| fizz(i)).collect()
}

fn looop(end: u32) -> String {
    (1..=end)
        .map(|i| fizz2(i))
        // .fold(String::new(), |acc, v| format!("{}\n{}", acc, v))
        .fold(String::new(), |acc, v| acc + &v)
}

fn fizz(i: u32) -> String {
    if i % 15 == 0 {
        return "FizzBuzz".to_string();
    } else if i % 3 == 0 {
        return "Fizz".to_string();
    } else if i % 5 == 0 {
        return "Buzz".to_string();
    } else {
        return i.to_string();
    }
}

fn fizz2(i: u32) -> String {
    match i {
        n if n % 15 == 0 => "FizzBuzz".to_string(),
        n if n % 3 == 0 => "Fizz".to_string(),
        n if n % 5 == 0 => "Buzz".to_string(),
        n => n.to_string(),
    }
}