rustlings/exercises/traits/traits1.rs
2020-02-25 09:48:50 +00:00

44 lines
800 B
Rust

// traits1.rs
// Time to implement some traits!
//
// Your task is to implement the trait
// `AppendBar' for the type `String'.
//
// The trait AppendBar has only one function,
// which appends "Bar" to any object
// implementing this trait.
// I AM NOT DONE
trait AppendBar {
fn append_bar(self) -> Self;
}
impl AppendBar for String {
//Add your code here
}
fn main() {
let s = String::from("Foo");
let s = s.append_bar();
println!("s: {}", s);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn is_FooBar() {
assert_eq!(String::from("Foo").append_bar(), String::from("FooBar"));
}
#[test]
fn is_BarBar() {
assert_eq!(
String::from("").append_bar().append_bar(),
String::from("BarBar")
);
}
}