Rust code shared from the playground

playground.rs

use std::str::FromStr;

fn main () {
    let mut input = "15 Bear".split(' ');
    // Need to pull the number and parse it.
    let number = input.next()
        // Process Option<&'static str> to Option<int>
        .and_then(|x| i32::from_str(x).ok() )
        .expect("Was not provided a valid number.");
    // The next token is our animal.
    let animal = input.next()
        .expect("Was not provided an animal.");
    // Ouput `number` times.
    for x in 0 .. number {
        println!("{} {} says hi!", animal, x)
    }
}