36 lines
824 B
Rust
36 lines
824 B
Rust
// traits2.rs
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//
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// Your task is to implement the trait
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// `AppendBar` for a vector of strings.
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//
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// To implement this trait, consider for
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// a moment what it means to 'append "Bar"'
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// to a vector of strings.
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//
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// No boiler plate code this time,
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// you can do this!
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// Execute `rustlings hint traits2` or use the `hint` watch subcommand for a hint.
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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 Vec<String> {
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fn append_bar(mut self) -> Vec<String> {
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self.push(String::from("Bar"));
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self
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}
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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_vec_pop_eq_bar() {
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let mut foo = vec![String::from("Foo")].append_bar();
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assert_eq!(foo.pop().unwrap(), String::from("Bar"));
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assert_eq!(foo.pop().unwrap(), String::from("Foo"));
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}
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}
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