Rendu TP 1: Rustlings - TEXIER - Antonin - AL1

exercises/clippy/clippy1.rs

@@ -6,12 +6,11 @@
 // check clippy's suggestions from the output to solve the exercise.
 // Execute `rustlings hint clippy1` for hints :)
 
-// I AM NOT DONE
 
 fn main() {
     let x = 1.2331f64;
     let y = 1.2332f64;
-    if y != x {
+    if (y - x).abs() > f64::EPSILON {
         println!("Success!");
     }
 }

exercises/clippy/clippy2.rs

@@ -1,12 +1,11 @@
 // clippy2.rs
 // Make me compile! Execute `rustlings hint clippy2` for hints :)
 
-// I AM NOT DONE
 
 fn main() {
     let mut res = 42;
     let option = Some(12);
-    for x in option {
+    if let Some(x) = option {
         res += x;
     }
     println!("{}", res);

exercises/collections/hashmap1.rs

@@ -11,17 +11,16 @@
 // Execute the command `rustlings hint collections3` if you need
 // hints.
 
-// I AM NOT DONE
 
 use std::collections::HashMap;
 
 fn fruit_basket() -> HashMap<String, u32> {
-    let mut basket = // TODO: declare your hash map here.
+    let mut basket = HashMap::new();
 
     // Two bananas are already given for you :)
     basket.insert(String::from("banana"), 2);
-
-    // TODO: Put more fruits in your basket here.
+    basket.insert(String::from("apple"), 1);
+    basket.insert(String::from("mango"), 3);
 
     basket
 }

exercises/collections/hashmap2.rs

@@ -12,7 +12,6 @@
 // Execute the command `rustlings hint collections4` if you need
 // hints.
 
-// I AM NOT DONE
 
 use std::collections::HashMap;
 
@@ -50,6 +49,8 @@ mod tests {
         basket.insert(Fruit::Apple, 4);
         basket.insert(Fruit::Mango, 2);
         basket.insert(Fruit::Lichi, 5);
+        basket.insert(Fruit::Pineapple, 6);
+        basket.insert(Fruit::Banana, 7);
 
         basket
     }

exercises/collections/vec1.rs

@@ -4,11 +4,12 @@
 // Make me compile and pass the test!
 // Execute the command `rustlings hint collections1` if you need hints.
 
-// I AM NOT DONE
 
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
-    let v = // TODO: declare your vector here with the macro for vectors
+    let mut v = Vec::new();
+
+    v.extend(&a);
 
     (a, v)
 }

exercises/collections/vec2.rs

@@ -7,12 +7,10 @@
 // Execute the command `rustlings hint collections2` if you need
 // hints.
 
-// I AM NOT DONE
 
 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
     for i in v.iter_mut() {
-        // TODO: Fill this up so that each element in the Vec `v` is
-        // multiplied by 2.
+        *i *= 2;
     }
 
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].

exercises/conversions/as_ref_mut.rs

@@ -2,17 +2,16 @@
 // Read more about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html
 // and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
 
-// I AM NOT DONE
 
 // Obtain the number of bytes (not characters) in the given argument
 // Add the AsRef trait appropriately as a trait bound
-fn byte_counter<T>(arg: T) -> usize {
+fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
     arg.as_ref().as_bytes().len()
 }
 
 // Obtain the number of characters (not bytes) in the given argument
 // Add the AsRef trait appropriately as a trait bound
-fn char_counter<T>(arg: T) -> usize {
+fn char_counter<T: AsRef<str>>(arg: T) -> usize {
     arg.as_ref().chars().count()
 }
 

exercises/conversions/from_into.rs

@@ -33,10 +33,29 @@ impl Default for Person {
 // If while parsing the age, something goes wrong, then return the default of Person
 // Otherwise, then return an instantiated Person object with the results
 
-// I AM NOT DONE
 
 impl From<&str> for Person {
     fn from(s: &str) -> Person {
+        let parts: Vec<&str> = s.split(',').collect();
+
+        if parts.len() < 2 {
+            return Person::default();
+        }
+
+        let name = parts[0];
+        let age = parts[1].parse::<i32>();
+
+        if name.is_empty() {
+            return Person::default();
+        }
+
+        match parts[1].parse() {
+            Ok(age) => Person {
+                name: String::from(name),
+                age,
+            },
+            Err(_) => Person::default(),
+        }
     }
 }
 

exercises/conversions/from_str.rs

@@ -10,7 +10,6 @@ struct Person {
     age: usize,
 }
 
-// I AM NOT DONE
 // Steps:
 // 1. If the length of the provided string is 0, then return an error
 // 2. Split the given string on the commas present in it
@@ -23,6 +22,26 @@ struct Person {
 impl FromStr for Person {
     type Err = String;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        let parts: Vec<&str> = s.split(',').collect();
+
+        if parts.len() < 2 {
+            return Err(String::from("Parsing error"));
+        }
+
+        let name = parts[0];
+        let age = parts[1].parse::<i32>();
+
+        if name.is_empty() {
+            return Err(String::from("No name given"));
+        }
+
+        match parts[1].parse() {
+            Ok(age) => Ok(Person {
+                name: String::from(name),
+                age,
+            }),
+            Err(_) => Err(String::from("Age parsing error")),
+        }
     }
 }
 

exercises/conversions/try_from_into.rs

@@ -11,7 +11,12 @@ struct Color {
     blue: u8,
 }
 
-// I AM NOT DONE
+fn isColorValid(red: i16, green: i16, blue: i16) -> bool {
+    let range = 0..=255;
+
+    range.contains(&red) && range.contains(&green) && range.contains(&blue)
+}
+
 
 // Your task is to complete this implementation
 // and return an Ok result of inner type Color.
@@ -25,19 +30,49 @@ struct Color {
 // Tuple implementation
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = String;
-    fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {}
+    fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        if isColorValid(tuple.0, tuple.1, tuple.2) {
+            Ok(Color {
+                red: tuple.0 as u8,
+                green: tuple.1 as u8,
+                blue: tuple.2 as u8,
+            })
+        } else {
+            Err(String::from("Invalid colors"))
+        }
+    }
 }
 
 // Array implementation
 impl TryFrom<[i16; 3]> for Color {
     type Error = String;
-    fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {}
+    fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+        if isColorValid(arr[0], arr[1], arr[2]) {
+            Ok(Color {
+                red: arr[0] as u8,
+                green: arr[1] as u8,
+                blue: arr[2] as u8,
+            })
+        } else {
+            Err(String::from("Invalid colors"))
+        }
+    }
 }
 
 // Slice implementation
 impl TryFrom<&[i16]> for Color {
     type Error = String;
-    fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {}
+    fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
+        if slice.len() == 3 && isColorValid(slice[0], slice[1], slice[2]) {
+            Ok(Color {
+                red: slice[0] as u8,
+                green: slice[1] as u8,
+                blue: slice[2] as u8,
+            })
+        } else {
+            Err(String::from("Invalid colors"))
+        }
+    }
 }
 
 fn main() {

exercises/conversions/using_as.rs

@@ -5,11 +5,10 @@
 // The goal is to make sure that the division does not fail to compile
 // and returns the proper type.
 
-// I AM NOT DONE
 
 fn average(values: &[f64]) -> f64 {
     let total = values.iter().fold(0.0, |a, b| a + b);
-    total / values.len()
+    total / values.len() as f64
 }
 
 fn main() {

exercises/enums/enums1.rs

@@ -1,11 +1,13 @@
 // enums1.rs
 // Make me compile! Execute `rustlings hint enums1` for hints!
 
-// I AM NOT DONE
 
 #[derive(Debug)]
 enum Message {
-    // TODO: define a few types of messages as used below
+    Quit,
+    Echo,
+    Move,
+    ChangeColor,
 }
 
 fn main() {

exercises/enums/enums2.rs

@@ -1,11 +1,13 @@
 // enums2.rs
 // Make me compile! Execute `rustlings hint enums2` for hints!
 
-// I AM NOT DONE
 
 #[derive(Debug)]
 enum Message {
-    // TODO: define the different variants used below
+    Move { x: i32, y: i32 },
+    Echo(String),
+    ChangeColor(i32, i32, i32),
+    Quit,
 }
 
 impl Message {

exercises/enums/enums3.rs

@@ -1,10 +1,12 @@
 // enums3.rs
 // Address all the TODOs to make the tests pass!
 
-// I AM NOT DONE
 
 enum Message {
-    // TODO: implement the message variant types based on their usage below
+    Move(Point),
+    Echo(String),
+    ChangeColor((u8, u8, u8)),
+    Quit,
 }
 
 struct Point {
@@ -36,7 +38,12 @@ impl State {
     }
 
     fn process(&mut self, message: Message) {
-        // TODO: create a match expression to process the different message variants
+        match message {
+            Message::ChangeColor(value) => self.change_color(value),
+            Message::Quit => self.quit(),
+            Message::Echo(value) => self.echo(value),
+            Message::Move(value) => self.move_position(value),
+        }
     }
 }
 

exercises/error_handling/errors1.rs

@@ -6,14 +6,13 @@
 // this function to have.
 // Execute `rustlings hint errors1` for hints!
 
-// I AM NOT DONE
 
-pub fn generate_nametag_text(name: String) -> Option<String> {
+pub fn generate_nametag_text(name: String) -> Result<String, String> {
     if name.len() > 0 {
-        Some(format!("Hi! My name is {}", name))
+        Ok(format!("Hi! My name is {}", name))
     } else {
         // Empty names aren't allowed.
-        None
+        Err("`name` was empty; it must be nonempty.".into())
     }
 }
 
@@ -28,7 +27,7 @@ mod tests {
     fn generates_nametag_text_for_a_nonempty_name() {
         assert_eq!(
             generate_nametag_text("Beyoncé".into()),
-            Some("Hi! My name is Beyoncé".into())
+            Ok("Hi! My name is Beyoncé".into())
         );
     }
 

exercises/error_handling/errors2.rs

@@ -16,14 +16,13 @@
 // There are at least two ways to implement this that are both correct-- but
 // one is a lot shorter! Execute `rustlings hint errors2` for hints to both ways.
 
-// I AM NOT DONE
 
 use std::num::ParseIntError;
 
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
     let processing_fee = 1;
     let cost_per_item = 5;
-    let qty = item_quantity.parse::<i32>();
+    let qty = item_quantity.parse::<i32>()?;
 
     Ok(qty * cost_per_item + processing_fee)
 }

exercises/error_handling/errors3.rs

@@ -4,11 +4,10 @@
 // Why not? What should we do to fix it?
 // Execute `rustlings hint errors3` for hints!
 
-// I AM NOT DONE
 
 use std::num::ParseIntError;
 
-fn main() {
+fn main() -> Result<(), ParseIntError> {
     let mut tokens = 100;
     let pretend_user_input = "8";
 
@@ -20,6 +19,8 @@ fn main() {
         tokens -= cost;
         println!("You now have {} tokens.", tokens);
     }
+
+    Ok(())
 }
 
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {