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