rustlings/exercises/quiz2.rs

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// quiz2.rs
// This is a quiz for the following sections:
// - Strings
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// - Vecs
// - Move semantics
// - Modules
// - Enums
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// Let's build a little machine in form of a function.
// As input, we're going to give a list of strings and commands. These commands
// determine what action is going to be applied to the string. It can either be:
// - Uppercase the string
// - Trim the string
// - Append "bar" to the string a specified amount of times
// The exact form of this will be:
// - The input is going to be a Vector of a 2-length tuple,
// the first element is the string, the second one is the command.
// - The output element is going to be a Vector of strings.
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// Execute `rustlings hint quiz2` or use the `hint` watch subcommand for a hint.
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pub enum Command {
Uppercase,
Trim,
Append(usize),
}
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mod my_module {
use super::Command;
// TODO: Complete the function signature!
pub fn transformer(input: ???) -> ??? {
// TODO: Complete the output declaration!
let mut output: ??? = vec![];
for (string, command) in input.iter() {
// TODO: Complete the function body. You can do it!
}
output
}
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}
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#[cfg(test)]
mod tests {
// TODO: What to we have to import to have `transformer` in scope?
use ???;
use super::Command;
#[test]
fn it_works() {
let output = transformer(vec![
("hello".into(), Command::Uppercase),
(" all roads lead to rome! ".into(), Command::Trim),
("foo".into(), Command::Append(1)),
("bar".into(), Command::Append(5)),
]);
assert_eq!(output[0], "HELLO");
assert_eq!(output[1], "all roads lead to rome!");
assert_eq!(output[2], "foobar");
assert_eq!(output[3], "barbarbarbarbarbar");
}
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}