From 1cf7c1885717c234c2459a424f2252f052372878 Mon Sep 17 00:00:00 2001
From: Emre AYDIN <aeaydin1@gmail.com>
Date: Wed, 6 Jan 2021 15:07:44 +0300
Subject: [PATCH] Generics exercises complete
---
exercises/generics/generics1.rs | 4 +---
exercises/generics/generics2.rs | 10 ++++------
exercises/generics/generics3.rs | 16 +++++++++-------
3 files changed, 14 insertions(+), 16 deletions(-)
diff --git a/exercises/generics/generics1.rs b/exercises/generics/generics1.rs
index 967287e..07a3ed8 100644
--- a/exercises/generics/generics1.rs
+++ b/exercises/generics/generics1.rs
@@ -1,9 +1,7 @@
// This shopping list program isn't compiling!
// Use your knowledge of generics to fix it.
-// I AM NOT DONE
-
fn main() {
- let mut shopping_list: Vec<?> = Vec::new();
+ let mut shopping_list: Vec<&str> = Vec::new();
shopping_list.push("milk");
}
diff --git a/exercises/generics/generics2.rs b/exercises/generics/generics2.rs
index 0cb59ad..57ae948 100644
--- a/exercises/generics/generics2.rs
+++ b/exercises/generics/generics2.rs
@@ -1,14 +1,12 @@
// This powerful wrapper provides the ability to store a positive integer value.
// Rewrite it using generics so that it supports wrapping ANY type.
-// I AM NOT DONE
-
-struct Wrapper {
- value: u32,
+struct Wrapper<T> {
+ value: T,
}
-impl Wrapper {
- pub fn new(value: u32) -> Self {
+impl<T> Wrapper<T> {
+ pub fn new(value: T) -> Self {
Wrapper { value }
}
}
diff --git a/exercises/generics/generics3.rs b/exercises/generics/generics3.rs
index 64dd9bc..39c58e9 100644
--- a/exercises/generics/generics3.rs
+++ b/exercises/generics/generics3.rs
@@ -10,18 +10,20 @@
// Execute 'rustlings hint generics3' for hints!
-// I AM NOT DONE
+use std::fmt;
-pub struct ReportCard {
- pub grade: f32,
+pub struct ReportCard<T: fmt::Display> {
+ pub grade: T,
pub student_name: String,
pub student_age: u8,
}
-impl ReportCard {
+impl<T: fmt::Display> ReportCard<T> {
pub fn print(&self) -> String {
- format!("{} ({}) - achieved a grade of {}",
- &self.student_name, &self.student_age, &self.grade)
+ format!(
+ "{} ({}) - achieved a grade of {}",
+ &self.student_name, &self.student_age, &self.grade
+ )
}
}
@@ -46,7 +48,7 @@ mod tests {
fn generate_alphabetic_report_card() {
// TODO: Make sure to change the grade here after you finish the exercise.
let report_card = ReportCard {
- grade: 2.1,
+ grade: "A+",
student_name: "Gary Plotter".to_string(),
student_age: 11,
};