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rustlings/solutions/15_traits/traits2.rs
2024-06-27 11:58:44 +02:00

27 lines
534 B
Rust

trait AppendBar {
fn append_bar(self) -> Self;
}
impl AppendBar for Vec<String> {
fn append_bar(mut self) -> Self {
// ^^^ this is important
self.push(String::from("Bar"));
self
}
}
fn main() {
// You can optionally experiment here.
}
#[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(), "Bar");
assert_eq!(foo.pop().unwrap(), "Foo");
}
}