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rustlings-exercises-completed/exercises/traits/traits2.rs

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// traits2.rs
//
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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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// To implement this trait, consider for
// a moment what it means to 'append "Bar"'
// to a vector of strings.
//
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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 {
fn append_bar(self) -> Self;
}
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// TODO: Implement trait `AppendBar` for a vector of strings.
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impl AppendBar for Vec<String> {
fn append_bar(self) -> Self {
let mut out = self.clone();
out.push(String::from("Bar"));
out
}
}
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#[cfg(test)]
mod tests {
use super::*;
#[test]
fn is_vec_pop_eq_bar() {
let mut foo = vec![String::from("Foo")].append_bar();
assert_eq!(foo.pop().unwrap(), String::from("Bar"));
assert_eq!(foo.pop().unwrap(), String::from("Foo"));
}
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}