Merge pull request #280 from sjmann/generics-exercises
feat: added generics exercises
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### Generics
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In this section you'll learn about saving yourself many lines of code with generics!
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### Book Sections
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- [Generic Data Types](https://doc.rust-lang.org/stable/book/ch10-01-syntax.html)
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// This shopping list program isn't compiling!
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// Use your knowledge of generics to fix it.
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// I AM NOT DONE
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fn main() {
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let mut shopping_list: Vec<?> = Vec::new();
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shopping_list.push("milk");
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}
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// This powerful wrapper provides the ability to store a positive integer value.
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// Rewrite it using generics so that it supports wrapping ANY type.
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// I AM NOT DONE
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struct Wrapper<u32> {
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value: u32
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}
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impl<u32> Wrapper<u32> {
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pub fn new(value: u32) -> Self {
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Wrapper { value }
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn store_u32_in_wrapper() {
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assert_eq!(Wrapper::new(42).value, 42);
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}
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#[test]
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fn store_str_in_wrapper() {
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// TODO: Delete this assert and uncomment the one below once you have finished the exercise.
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assert!(false);
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// assert_eq!(Wrapper::new("Foo").value, "Foo");
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}
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}
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// An imaginary magical school has a new report card generation system written in rust!
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// Currently the system only supports creating report cards where the student's grade
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// is represented numerically (e.g. 1.0 -> 5.5). However, the school also issues alphabetical grades
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// (A+ -> F-) and needs to be able to print both types of report card!
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// Make the necessary code changes to support alphabetical report cards, thereby making the second
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// test pass.
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// I AM NOT DONE
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pub struct ReportCard {
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pub grade: f32,
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pub student_name: String,
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pub student_age: u8,
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}
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impl ReportCard {
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pub fn print(&self) -> String {
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format!("{} ({}) - achieved a grade of {}", &self.student_name, &self.student_age, &self.grade)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn generate_numeric_report_card() {
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let report_card = ReportCard {
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grade: 2.1,
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student_name: "Tom Wriggle".to_string(),
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student_age: 12,
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};
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assert_eq!(report_card.print(), "Tom Wriggle (12) - achieved a grade of 2.1");
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}
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#[test]
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fn generate_alphabetic_report_card() {
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// TODO: Make sure to change the grade here after you finish the exercise.
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let report_card = ReportCard {
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grade: 2.1,
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student_name: "Gary Plotter".to_string(),
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student_age: 11,
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};
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assert_eq!(report_card.print(), "Gary Plotter (11) - achieved a grade of A+");
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}
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}
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info.toml
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info.toml
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Vectors provide suitable methods for adding an element at the end. See
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the documentation at: https://doc.rust-lang.org/std/vec/struct.Vec.html"""
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# Generics
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[[exercises]]
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name = "generics1"
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path = "exercises/generics/generics1.rs"
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mode = "compile"
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hint = """
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Vectors in rust make use of generics to create dynamically sized arrays of any type.
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You need to tell the compiler what type we are pushing onto this vector."""
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[[exercises]]
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name = "generics2"
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path = "exercises/generics/generics2.rs"
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mode = "test"
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hint = """
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Think carefully about what we need to do here. Currently we are wrapping only values of
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type 'u32'. Maybe we need to update the explicit references to this data type somehow?
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"""
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[[exercises]]
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name = "generics3"
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path = "exercises/generics/generics3.rs"
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mode = "test"
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hint = """
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To find the best solution to this challenge you're going to need to think back to your
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knowledge of traits, specifically Trait Bound Syntax - you may also need this: "use std::fmt::Display;"
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This is definitely harder than the last two exercises! You need to think about not only making the
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ReportCard struct generic, but also the correct property - you will need to change the implementation
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of the struct slightly too...you can do it!
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"""
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# THREADS
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[[exercises]]
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