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rustlings/solutions/15_traits/traits1.rs
2024-06-27 03:04:57 +02:00

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620 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 {
fn append_bar(self) -> Self {
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");
}
}