Rustlings for NaUKMA

rustlings/exercises/advanced_errors/advanced_errs1.rs

@@ -7,7 +7,7 @@
 // Make this code compile! Execute `rustlings hint advanced_errs1` for
 // hints :)
 
-// I AM NOT DONE
+// I AM DONE
 
 use std::num::ParseIntError;
 use std::str::FromStr;
@@ -24,13 +24,20 @@ impl From<CreationError> for ParsePosNonzeroError {
     fn from(e: CreationError) -> Self {
         // TODO: complete this implementation so that the `?` operator will
         // work for `CreationError`
+        ParsePosNonzeroError::Creation(e)
     }
 }
 
 // TODO: implement another instance of the `From` trait here so that the
 // `?` operator will work in the other place in the `FromStr`
 // implementation below.
 
+impl From<ParseIntError> for ParsePosNonzeroError {
+    fn from(e: ParseIntError) -> Self {
+        ParsePosNonzeroError::ParseInt(e)
+    }
+}
+
 // Don't change anything below this line.
 
 impl FromStr for PositiveNonzeroInteger {

rustlings/exercises/advanced_errors/advanced_errs2.rs

@@ -16,7 +16,7 @@
 // 4. Complete the partial implementation of `Display` for
 //    `ParseClimateError`.
 
-// I AM NOT DONE
+// I AM DONE
 
 use std::error::Error;
 use std::fmt::{self, Display, Formatter};
@@ -46,12 +46,21 @@ impl From<ParseIntError> for ParseClimateError {
 // `ParseFloatError` values.
 impl From<ParseFloatError> for ParseClimateError {
     fn from(e: ParseFloatError) -> Self {
-        // TODO: Complete this function
+        Self::ParseFloat(e)
     }
 }
 
 // TODO: Implement a missing trait so that `main()` below will compile. It
 // is not necessary to implement any methods inside the missing trait.
+impl Error for ParseClimateError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            ParseClimateError::ParseInt(e) => Some(e),
+            ParseClimateError::ParseFloat(e) => Some(e),
+            _ => None,
+        }
+    }
+}
 
 // The `Display` trait allows for other code to obtain the error formatted
 // as a user-visible string.
@@ -61,9 +70,13 @@ impl Display for ParseClimateError {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         // Imports the variants to make the following code more compact.
         use ParseClimateError::*;
+
         match self {
             NoCity => write!(f, "no city name"),
             ParseFloat(e) => write!(f, "error parsing temperature: {}", e),
+            ParseInt(e) => write!(f, "error parsing year: {}", e),
+            Empty => write!(f, "empty input"),
+            BadLen => write!(f, "incorrect number of fields"),
         }
     }
 }
@@ -88,11 +101,17 @@ impl FromStr for Climate {
     // TODO: Complete this function by making it handle the missing error
     // cases.
     fn from_str(s: &str) -> Result<Self, Self::Err> {
+        if s.is_empty() {
+            return Err(ParseClimateError::Empty);
+        }
         let v: Vec<_> = s.split(',').collect();
         let (city, year, temp) = match &v[..] {
             [city, year, temp] => (city.to_string(), year, temp),
             _ => return Err(ParseClimateError::BadLen),
         };
+        if city.is_empty() {
+            return Err(ParseClimateError::NoCity);
+        }
         let year: u32 = year.parse()?;
         let temp: f32 = temp.parse()?;
         Ok(Climate { city, year, temp })
@@ -190,7 +209,6 @@ mod test {
         );
     }
     #[test]
-    #[ignore]
     fn test_downcast() {
         let res = "São Paulo,-21,28.5".parse::<Climate>();
         assert!(matches!(res, Err(ParseClimateError::ParseInt(_))));

rustlings/exercises/clippy/clippy1.rs

@@ -6,12 +6,12 @@
 // check clippy's suggestions from the output to solve the exercise.
 // Execute `rustlings hint clippy1` for hints :)
 
-// I AM NOT DONE
+// I AM DONE
 
 use std::f32;
 
 fn main() {
-    let pi = 3.14f32;
+    let pi = f32::consts::PI;
     let radius = 5.00f32;
 
     let area = pi * f32::powi(radius, 2);

rustlings/exercises/clippy/clippy2.rs

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

rustlings/exercises/collections/hashmap1.rs

@@ -11,18 +11,20 @@
 // Execute the command `rustlings hint hashmap1` if you need
 // hints.
 
-// I AM NOT DONE
+// I AM 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("orange"), 2);
     basket
 }
 

rustlings/exercises/collections/hashmap2.rs

@@ -12,7 +12,7 @@
 // Execute the command `rustlings hint hashmap2` if you need
 // hints.
 
-// I AM NOT DONE
+// I AM DONE
 
 use std::collections::HashMap;
 
@@ -38,6 +38,25 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
         // TODO: Put new fruits if not already present. Note that you
         // are not allowed to put any type of fruit that's already
         // present!
+        if !basket.contains_key(&fruit) {
+            match fruit {
+                Fruit::Apple => {
+                    basket.insert(Fruit::Apple, 4);
+                }
+                Fruit::Mango => {
+                    basket.insert(Fruit::Mango, 2);
+                }
+                Fruit::Lychee => {
+                    basket.insert(Fruit::Lychee, 5);
+                }
+                Fruit::Banana => {
+                    basket.insert(Fruit::Banana, 3);
+                }
+                Fruit::Pineapple => {
+                    basket.insert(Fruit::Pineapple, 2);
+                }
+            }
+        }
     }
 }
 

rustlings/exercises/collections/vec1.rs

@@ -4,11 +4,11 @@
 // Make me compile and pass the test!
 // Execute the command `rustlings hint vec1` if you need hints.
 
-// I AM NOT DONE
+// I AM 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 v = vec![10, 20, 30, 40];
 
     (a, v)
 }

rustlings/exercises/collections/vec2.rs

@@ -7,12 +7,12 @@
 // Execute the command `rustlings hint vec2` if you need
 // hints.
 
-// I AM NOT DONE
+// I AM 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 = *i * 2;
     }
 
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].

rustlings/exercises/conversions/as_ref_mut.rs

@@ -2,17 +2,17 @@
 // 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
+// I AM 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()
 }
 

rustlings/exercises/conversions/from_into.rs

@@ -33,10 +33,32 @@ 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
+// I AM DONE
 
 impl From<&str> for Person {
     fn from(s: &str) -> Person {
+        if s.len() == 0 {
+            return Person::default();
+        }
+        let parts: Vec<&str> = s.split(',').collect();
+        let name = parts[0];
+        if name.len() == 0 {
+            return Person::default();
+        }
+        let age = match parts.get(1) {
+            Some(age) => age.parse::<usize>().unwrap_or(0),
+            None => 0,
+        };
+        if age == 0 {
+            return Person::default();
+        }
+        if parts.len() != 2 {
+            return Person::default();
+        }
+        Person {
+            name: name.to_string(),
+            age,
+        }
     }
 }
 

rustlings/exercises/conversions/from_str.rs

@@ -26,7 +26,7 @@ enum ParsePersonError {
     ParseInt(ParseIntError),
 }
 
-// I AM NOT DONE
+// I AM DONE
 
 // Steps:
 // 1. If the length of the provided string is 0, an error should be returned
@@ -41,6 +41,22 @@ enum ParsePersonError {
 impl FromStr for Person {
     type Err = ParsePersonError;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        if s.len() == 0 {
+            return Err(ParsePersonError::Empty);
+        }
+        let parts: Vec<&str> = s.split(',').collect();
+        if parts.len() != 2 {
+            return Err(ParsePersonError::BadLen);
+        }
+        let name = parts[0];
+        if name.len() == 0 {
+            return Err(ParsePersonError::NoName);
+        }
+        let age = parts[1].parse::<usize>().map_err(ParsePersonError::ParseInt)?;
+        Ok(Person {
+            name: name.to_string(),
+            age,
+        })
     }
 }
 

rustlings/exercises/conversions/try_from_into.rs

@@ -21,7 +21,7 @@ enum IntoColorError {
     IntConversion,
 }
 
-// I AM NOT DONE
+// I AM DONE
 
 // Your task is to complete this implementation
 // and return an Ok result of inner type Color.
@@ -36,20 +36,52 @@ enum IntoColorError {
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        let (red, green, blue) = tuple;
+        if red < 0 || red > 255 || green < 0 || green > 255 || blue < 0 || blue > 255 {
+            return Err(IntoColorError::IntConversion);
+        }
+        Ok(Color {
+            red: red as u8,
+            green: green as u8,
+            blue: blue as u8,
+        })
     }
 }
 
 // Array implementation
 impl TryFrom<[i16; 3]> for Color {
     type Error = IntoColorError;
     fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+        let [red, green, blue] = arr;
+        if red < 0 || red > 255 || green < 0 || green > 255 || blue < 0 || blue > 255 {
+            return Err(IntoColorError::IntConversion);
+        }
+        Ok(Color {
+            red: red as u8,
+            green: green as u8,
+            blue: blue as u8,
+        })
     }
 }
 
 // Slice implementation
 impl TryFrom<&[i16]> for Color {
     type Error = IntoColorError;
     fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
+        if slice.len() != 3 {
+            return Err(IntoColorError::BadLen);
+        }
+        let red = slice[0];
+        let green = slice[1];
+        let blue = slice[2];
+        if red < 0 || red > 255 || green < 0 || green > 255 || blue < 0 || blue > 255 {
+            return Err(IntoColorError::IntConversion);
+        }
+        Ok(Color {
+            red: red as u8,
+            green: green as u8,
+            blue: blue as u8,
+        })
     }
 }
 

rustlings/exercises/conversions/using_as.rs

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

rustlings/exercises/enums/enums1.rs

@@ -1,11 +1,14 @@
 // enums1.rs
 // Make me compile! Execute `rustlings hint enums1` for hints!
 
-// I AM NOT DONE
+// I AM DONE
 
 #[derive(Debug)]
 enum Message {
-    // TODO: define a few types of messages as used below
+    Quit,
+    Echo,
+    Move,
+    ChangeColor,
 }
 
 fn main() {