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exercises/quizzes/README.md

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+# Quizzes
+
+After every couple of sections, there will be a quiz in this directory that'll test your knowledge on a bunch of sections at once.

exercises/quizzes/quiz1.rs

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+// This is a quiz for the following sections:
+// - Variables
+// - Functions
+// - If
+//
+// Mary is buying apples. The price of an apple is calculated as follows:
+// - An apple costs 2 rustbucks.
+// - However, if Mary buys more than 40 apples, the price of each apple in the
+// entire order is reduced to only 1 rustbuck!
+
+// TODO: Write a function that calculates the price of an order of apples given
+// the quantity bought.
+// fn calculate_price_of_apples(???) -> ??? { ??? }
+
+fn calculate_price_of_apples(num: i32) -> i32 {
+    if num > 40 {
+        num
+    } else {
+        num * 2
+    }
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+// Don't change the tests!
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn verify_test() {
+        assert_eq!(calculate_price_of_apples(35), 70);
+        assert_eq!(calculate_price_of_apples(40), 80);
+        assert_eq!(calculate_price_of_apples(41), 41);
+        assert_eq!(calculate_price_of_apples(65), 65);
+    }
+}

exercises/quizzes/quiz2.rs

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+// This is a quiz for the following sections:
+// - Strings
+// - Vecs
+// - Move semantics
+// - Modules
+// - Enums
+//
+// Let's build a little machine in the 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 2-length tuples,
+//   the first element is the string, the second one is the command.
+// - The output element is going to be a vector of strings.
+
+enum Command {
+    Uppercase,
+    Trim,
+    Append(usize),
+}
+
+mod my_module {
+    use super::Command;
+
+    // TODO: Complete the function as described above.
+    // pub fn transformer(input: ???) -> ??? { ??? }
+    pub fn transformer(input: Vec<(String, Command)>) -> Vec<String> {
+        let mut result = vec![];
+        for data in &input {
+            match data.1 {
+                Command::Uppercase => {
+                    result.push(data.0.to_uppercase());
+                }
+                Command::Trim => {
+                    result.push(data.0.trim().to_string());
+                }
+                Command::Append(n) => {
+                    result.push(format!("{}{}", data.0, "bar".repeat(n)));
+                }
+            }
+        }
+        result
+    }
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    // TODO: What do we need to import to have `transformer` in scope?
+    // use ???;
+    use super::Command;
+    use crate::my_module::transformer;
+
+    #[test]
+    fn it_works() {
+        let input = vec![
+            ("hello".to_string(), Command::Uppercase),
+            (" all roads lead to rome! ".to_string(), Command::Trim),
+            ("foo".to_string(), Command::Append(1)),
+            ("bar".to_string(), Command::Append(5)),
+        ];
+        let output = transformer(input);
+
+        assert_eq!(
+            output,
+            [
+                "HELLO",
+                "all roads lead to rome!",
+                "foobar",
+                "barbarbarbarbarbar",
+            ]
+        );
+    }
+}

exercises/quizzes/quiz3.rs

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+// This quiz tests:
+// - Generics
+// - Traits
+//
+// An imaginary magical school has a new report card generation system written
+// in Rust! Currently, the system only supports creating report cards where the
+// student's grade is represented numerically (e.g. 1.0 -> 5.5). However, the
+// school also issues alphabetical grades (A+ -> F-) and needs to be able to
+// print both types of report card!
+//
+// Make the necessary code changes in the struct `ReportCard` and the impl
+// block to support alphabetical report cards in addition to numerical ones.
+use std::fmt::Display;
+
+// TODO: Adjust the struct as described above.
+struct ReportCard<T> {
+    grade: T,
+    student_name: String,
+    student_age: u8,
+}
+
+// TODO: Adjust the impl block as described above.
+impl<T: Display> ReportCard<T> {
+    fn print(&self) -> String {
+        format!(
+            "{} ({}) - achieved a grade of {}",
+            &self.student_name, &self.student_age, &self.grade,
+        )
+    }
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn generate_numeric_report_card() {
+        let report_card = ReportCard {
+            grade: 2.1,
+            student_name: "Tom Wriggle".to_string(),
+            student_age: 12,
+        };
+        assert_eq!(
+            report_card.print(),
+            "Tom Wriggle (12) - achieved a grade of 2.1",
+        );
+    }
+
+    #[test]
+    fn generate_alphabetic_report_card() {
+        let report_card = ReportCard {
+            grade: "A+",
+            student_name: "Gary Plotter".to_string(),
+            student_age: 11,
+        };
+        assert_eq!(
+            report_card.print(),
+            "Gary Plotter (11) - achieved a grade of A+",
+        );
+    }
+}