rustlings/exercises/15_traits/traits1.rs

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