Traits in Rust example

rust_trait.rs

//Traits in Rust: https://www.youtube.com/watch?v=T0Xfltu4h3A

pub trait Summary {
    fn summarize_author(&self) -> String;
    fn summarize(&self) -> String {
        format!("(Read more from {}...)", self.summarize_author())
    }
}

fn returns_summarizable() -> impl Summary {
    Tweet {
            username: String::from("@horse"),
            content: String::from("I'm fast af boi"),
            reply: false,
            retweet: false,
    }
}

pub struct NewsArticle {
    pub author: String,
    pub headline: String,
    pub content: String,
}

impl Summary for NewsArticle {
    fn summarize_author(&self) -> String {
        format!("{}", self.author)
    }
}

pub struct Tweet {
    pub username: String,
    pub content: String,
    pub reply: bool,
    pub retweet: bool,
}

impl Summary for Tweet {
    fn summarize_author(&self) -> String {
        format!("{}", self.username)
    }
    fn summarize(&self) -> String {
        format!("{}: {}", self.username, self.content)
    }
}

pub fn notify<T: Summary>(item: &T) {
    println!("Breaking news! {}", item.summarize());
}

fn main() {
    
    let article = NewsArticle {
            author: String::from("YeetBoi"),
            headline: String::from("West Virginia"),
            content: String::from("Yeehaw my dude"),
    };
    
    println!("{}", returns_summarizable().summarize_author())
    
}