75 lines
2.2 KiB
Rust
75 lines
2.2 KiB
Rust
// quiz2.rs
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//
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// This is a quiz for the following sections:
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// - Strings
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// - Vecs
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// - Move semantics
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// - Modules
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// - Enums
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//
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// Let's build a little machine in the form of a function. As input, we're going
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// to give a list of strings and commands. These commands determine what action
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// is going to be applied to the string. It can either be:
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// - Uppercase the string
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// - Trim the string
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// - Append "bar" to the string a specified amount of times
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// The exact form of this will be:
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// - The input is going to be a Vector of a 2-length tuple,
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// the first element is the string, the second one is the command.
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// - The output element is going to be a Vector of strings.
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//
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// No hints this time!
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pub enum Command {
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Uppercase,
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Trim,
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Append(usize),
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}
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mod my_module {
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use super::Command;
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// TODO: Complete the function signature!
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pub fn transformer(input: Vec<(String, Command)>) -> Vec<String> {
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// TODO: Complete the output declaration!
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let mut output: Vec<String> = vec![];
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for (string, command) in input.iter() {
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// TODO: Complete the function body. You can do it!
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match command {
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Command::Uppercase => output.push(string.to_uppercase()),
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Command::Trim => output.push(string.trim().to_string()),
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Command::Append(i) =>{
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let mut string = string.to_string();
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for foo in 0..*i {
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string += "bar";
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}
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output.push(string)
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},
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}
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}
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output
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}
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}
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#[cfg(test)]
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mod tests {
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// TODO: What do we need to import to have `transformer` in scope?
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use crate::my_module::transformer;
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use super::Command;
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#[test]
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fn it_works() {
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let output = transformer(vec![
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("hello".into(), Command::Uppercase),
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(" all roads lead to rome! ".into(), Command::Trim),
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("foo".into(), Command::Append(1)),
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("bar".into(), Command::Append(5)),
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]);
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assert_eq!(output[0], "HELLO");
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assert_eq!(output[1], "all roads lead to rome!");
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assert_eq!(output[2], "foobar");
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assert_eq!(output[3], "barbarbarbarbarbar");
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}
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}
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