feat: rework quiz2

This commit is contained in:
mokou 2022-07-14 13:16:32 +02:00
parent f443f4e7b3
commit c64b340622
2 changed files with 52 additions and 23 deletions

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@ -1,30 +1,59 @@
// quiz2.rs
// This is a quiz for the following sections:
// - Strings
// - Vecs
// - Move semantics
// - Modules
// - Enums
// Ok, here are a bunch of values-- some are `String`s, some are `&str`s. Your
// task is to call one of these two functions on each value depending on what
// you think each value is. That is, add either `string_slice` or `string`
// before the parentheses on each line. If you're right, it will compile!
// 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.
// I AM NOT DONE
fn string_slice(arg: &str) {
println!("{}", arg);
}
fn string(arg: String) {
println!("{}", arg);
pub enum Command {
Uppercase,
Trim,
Append(usize),
}
fn main() {
???("blue");
???("red".to_string());
???(String::from("hi"));
???("rust is fun!".to_owned());
???("nice weather".into());
???(format!("Interpolation {}", "Station"));
???(&String::from("abc")[0..1]);
???(" hello there ".trim());
???("Happy Monday!".to_string().replace("Mon", "Tues"));
???("mY sHiFt KeY iS sTiCkY".to_lowercase());
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
}
}
#[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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@ -528,7 +528,7 @@ Learn more at https://doc.rust-lang.org/book/ch08-03-hash-maps.html#updating-a-v
[[exercises]]
name = "quiz2"
path = "exercises/quiz2.rs"
mode = "compile"
mode = "test"
hint = "No hints this time ;)"
# ERROR HANDLING