rustlings/exercises/traits/traits2.rs

35 lines
869 B
Rust

// traits2.rs
//
// Your task is to implement the trait `AppendBar` for a vector of strings. To
// implement this trait, consider for a moment what it means to 'append "Bar"'
// to a vector of strings.
//
// No boiler plate code this time, you can do this!
//
// Execute `rustlings hint traits2` or use the `hint` watch subcommand for a hint.
trait AppendBar {
fn append_bar(self) -> Self;
}
// TODO: Implement trait `AppendBar` for a vector of strings.
impl AppendBar for Vec<String> {
fn append_bar(mut self) -> Self {
self.push("Bar".to_string());
self
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn is_vec_pop_eq_bar() {
let mut foo = vec![String::from("Foo")].append_bar();
assert_eq!(foo.pop().unwrap(), String::from("Bar"));
assert_eq!(foo.pop().unwrap(), String::from("Foo"));
}
}