main.rs

fn main() {
    let target = Film {
        horror: 5.0,
        thriller: 4.0,
        romance: 0.0,
        comedy: 0.0,
    };

    let films = [
        (
            "Conjuring",
            Film {
                horror: 5.0,
                thriller: 5.0,
                romance: 0.0,
                comedy: 2.0,
            },
        ),
        (
            "Anyone but you",
            Film {
                horror: 1.0,
                thriller: 1.0,
                romance: 4.0,
                comedy: 3.0,
            },
        ),
        (
            "Star Wars",
            Film {
                horror: 2.0,
                thriller: 5.0,
                romance: 1.0,
                comedy: 3.0,
            },
        ),
    ];

    for (name, film) in films {
        let mut distance_to_target = film.squared_distance_to_point(&target);
        println!("{name} is {distance_to_target}");
    }
}

#[derive(Debug, Copy, Clone)]
pub struct Film {
    horror: f32,
    thriller: f32,
    romance: f32,
    comedy: f32,
}

impl Film {
    pub fn squared_distance_to_point(&self, other: &Film) -> f32 {
        (self.horror - other.horror).powi(2)
            + (self.thriller - other.thriller).powi(2)
            + (self.romance - other.romance).powi(2)
            + (self.comedy - other.comedy).powi(2)
    }
}