34 lines
688 B
Rust
34 lines
688 B
Rust
// The trait `AppendBar` has only one function which appends "Bar" to any object
|
|
// implementing this trait.
|
|
trait AppendBar {
|
|
fn append_bar(self) -> Self;
|
|
}
|
|
|
|
impl AppendBar for String {
|
|
// TODO: Implement `AppendBar` for the type `String`.
|
|
fn append_bar(self) -> String {
|
|
format!("{self}Bar")
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let s = String::from("Foo");
|
|
let s = s.append_bar();
|
|
println!("s: {s}");
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn is_foo_bar() {
|
|
assert_eq!(String::from("Foo").append_bar(), "FooBar");
|
|
}
|
|
|
|
#[test]
|
|
fn is_bar_bar() {
|
|
assert_eq!(String::from("").append_bar().append_bar(), "BarBar");
|
|
}
|
|
}
|