structs3 solution

This commit is contained in:
mo8it 2024-06-21 22:54:00 +02:00
parent 1264510fc0
commit d6fd251a73
3 changed files with 101 additions and 18 deletions

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@ -1,6 +1,5 @@
// Structs contain data, but can also have logic. In this exercise we have // Structs contain data, but can also have logic. In this exercise we have
// defined the Package struct and we want to test some logic attached to it. // defined the `Package` struct and we want to test some logic attached to it.
// Make the code compile and the tests pass!
#[derive(Debug)] #[derive(Debug)]
struct Package { struct Package {
@ -10,26 +9,28 @@ struct Package {
} }
impl Package { impl Package {
fn new(sender_country: String, recipient_country: String, weight_in_grams: u32) -> Package { fn new(sender_country: String, recipient_country: String, weight_in_grams: u32) -> Self {
if weight_in_grams < 10 { if weight_in_grams < 10 {
// This is not how you should handle errors in Rust, // This isn't how you should handle errors in Rust, but we will
// but we will learn about error handling later. // learn about error handling later.
panic!("Can not ship a package with weight below 10 grams.") panic!("Can't ship a package with weight below 10 grams");
} else { }
Package {
Self {
sender_country, sender_country,
recipient_country, recipient_country,
weight_in_grams, weight_in_grams,
} }
} }
// TODO: Add the correct return type to the function signature.
fn is_international(&self) {
// TODO: Read the tests that use this method to find out when a package is concidered international.
} }
fn is_international(&self) -> ??? { // TODO: Add the correct return type to the function signature.
// Something goes here... fn get_fees(&self, cents_per_gram: u32) {
} // TODO: Calculate the package's fees.
fn get_fees(&self, cents_per_gram: u32) -> ??? {
// Something goes here...
} }
} }

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@ -434,7 +434,7 @@ the places it goes through right?
For `get_fees`: This method takes an additional argument, is there a field in For `get_fees`: This method takes an additional argument, is there a field in
the `Package` struct that this relates to? the `Package` struct that this relates to?
Have a look in The Book, to find out more about method implementations: Have a look in The Book to find out more about method implementations:
https://doc.rust-lang.org/book/ch05-03-method-syntax.html""" https://doc.rust-lang.org/book/ch05-03-method-syntax.html"""
# ENUMS # ENUMS

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@ -1 +1,83 @@
// Solutions will be available before the stable release. Thank you for testing the beta version 🥰 #[derive(Debug)]
struct Package {
sender_country: String,
recipient_country: String,
weight_in_grams: u32,
}
impl Package {
fn new(sender_country: String, recipient_country: String, weight_in_grams: u32) -> Self {
if weight_in_grams < 10 {
// This isn't how you should handle errors in Rust, but we will
// learn about error handling later.
panic!("Can't ship a package with weight below 10 grams");
}
Self {
sender_country,
recipient_country,
weight_in_grams,
}
}
fn is_international(&self) -> bool {
// ^^^^^^^ added
self.sender_country != self.recipient_country
}
fn get_fees(&self, cents_per_gram: u32) -> u32 {
// ^^^^^^ added
self.weight_in_grams * cents_per_gram
}
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[should_panic]
fn fail_creating_weightless_package() {
let sender_country = String::from("Spain");
let recipient_country = String::from("Austria");
Package::new(sender_country, recipient_country, 5);
}
#[test]
fn create_international_package() {
let sender_country = String::from("Spain");
let recipient_country = String::from("Russia");
let package = Package::new(sender_country, recipient_country, 1200);
assert!(package.is_international());
}
#[test]
fn create_local_package() {
let sender_country = String::from("Canada");
let recipient_country = sender_country.clone();
let package = Package::new(sender_country, recipient_country, 1200);
assert!(!package.is_international());
}
#[test]
fn calculate_transport_fees() {
let sender_country = String::from("Spain");
let recipient_country = String::from("Spain");
let cents_per_gram = 3;
let package = Package::new(sender_country, recipient_country, 1500);
assert_eq!(package.get_fees(cents_per_gram), 4500);
assert_eq!(package.get_fees(cents_per_gram * 2), 9000);
}
}