20231010

exercises/clippy/clippy1.rs

@@ -9,12 +9,12 @@
 // Execute `rustlings hint clippy1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT 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);

exercises/clippy/clippy2.rs

@@ -3,12 +3,15 @@
 // Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn main() {
     let mut res = 42;
     let option = Some(12);
-    for x in option {
+    /*for x in option {
+        res += x;
+    }*/
+    if let Some(x) = option {
         res += x;
     }
     println!("{}", res);

exercises/clippy/clippy3.rs

@@ -3,28 +3,29 @@
 // Here's a couple more easy Clippy fixes, so you can see its utility.
 // No hints.
 
-// I AM NOT DONE
+
 
 #[allow(unused_variables, unused_assignments)]
 fn main() {
     let my_option: Option<()> = None;
     if my_option.is_none() {
-        my_option.unwrap();
+        // my_option.unwrap();
     }
 
     let my_arr = &[
-        -1, -2, -3
+        -1, -2, -3,
         -4, -5, -6
     ];
     println!("My array! Here it is: {:?}", my_arr);
 
-    let my_empty_vec = vec![1, 2, 3, 4, 5].resize(0, 5);
+    let my_empty_vec = vec![1, 2, 3, 4, 5];
     println!("This Vec is empty, see? {:?}", my_empty_vec);
 
     let mut value_a = 45;
     let mut value_b = 66;
     // Let's swap these two!
-    value_a = value_b;
-    value_b = value_a;
+    //value_a = value_b;
+    //value_b = value_a;
+    std::mem::swap(&mut value_a, &mut value_b);
     println!("value a: {}; value b: {}", value_a, value_b);
 }

exercises/conversions/as_ref_mut.rs

@@ -7,25 +7,25 @@
 // Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 // Obtain the number of bytes (not characters) in the given argument.
 // TODO: 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.
 // TODO: 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()
 }
 
 // Squares a number using as_mut().
 // TODO: Add the appropriate trait bound.
-fn num_sq<T>(arg: &mut T) {
+fn num_sq<T: AsMut<u32>>(arg: &mut T) {
     // TODO: Implement the function body.
-    ???
+    *arg.as_mut() = *arg.as_mut() * *arg.as_mut();
 }
 
 #[cfg(test)]

exercises/conversions/from_into.rs

@@ -40,10 +40,26 @@ 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 persion: Vec<&str> = s.split(',').collect();
+        if persion.len() < 2 || persion[0].len() == 0 {
+            return Person::default();
+        }
+
+        let name = persion[0].to_string();
+        let age = match persion[1].parse::<usize>() {
+            Ok(r) => r,
+            _ => return Person::default()
+        };
+
+        Person {
+            name,
+            age
+        }
     }
 }
 

exercises/conversions/from_str.rs

@@ -31,7 +31,7 @@ enum ParsePersonError {
     ParseInt(ParseIntError),
 }
 
-// I AM NOT DONE
+
 
 // Steps:
 // 1. If the length of the provided string is 0, an error should be returned
@@ -52,6 +52,26 @@ 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 persion: Vec<&str> = s.split(',').collect();
+        if persion.len() != 2 {
+            return Err(ParsePersonError::BadLen);
+        }
+
+        if persion[0].len() == 0 {
+            return Err(ParsePersonError::NoName);
+        }
+
+        let name = persion[0].to_string();
+        let age = persion[1].parse::<usize>().map_err(ParsePersonError::ParseInt)?;
+
+        Ok(Person {
+            name,
+            age
+        })
     }
 }
 

exercises/conversions/try_from_into.rs

@@ -27,7 +27,7 @@ enum IntoColorError {
     IntConversion,
 }
 
-// I AM NOT DONE
+
 
 // Your task is to complete this implementation and return an Ok result of inner
 // type Color. You need to create an implementation for a tuple of three
@@ -41,6 +41,16 @@ enum IntoColorError {
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        if tuple.0 > 255 || tuple.0 < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        if tuple.1 > 255 || tuple.1 < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        if tuple.2 > 255 || tuple.2 < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        Ok(Self { red: tuple.0 as u8, green: tuple.1 as u8, blue: tuple.2 as u8 })
     }
 }
 
@@ -48,6 +58,16 @@ impl TryFrom<(i16, i16, i16)> for Color {
 impl TryFrom<[i16; 3]> for Color {
     type Error = IntoColorError;
     fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+        if arr[0] > 255 || arr[0] < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        if arr[1] > 255 || arr[1] < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        if arr[2] > 255 || arr[2] < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        Ok(Self { red: arr[0] as u8, green: arr[1] as u8, blue: arr[2] as u8 })
     }
 }
 
@@ -55,6 +75,19 @@ impl TryFrom<[i16; 3]> for Color {
 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);
+        }
+        if slice[0] > 255 || slice[0] < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        if slice[1] > 255 || slice[1] < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        if slice[2] > 255 || slice[2] < 0 {
+            return Err(IntoColorError::IntConversion);
+        }
+        Ok(Self { red: slice[0] as u8, green: slice[1] as u8, blue: slice[2] as u8 })
     }
 }
 

exercises/conversions/using_as.rs

@@ -10,11 +10,11 @@
 // Execute `rustlings hint using_as` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn average(values: &[f64]) -> f64 {
     let total = values.iter().sum::<f64>();
-    total / values.len()
+    total / values.len() as f64
 }
 
 fn main() {

exercises/iterators/iterators1.rs

@@ -9,18 +9,18 @@
 // Execute `rustlings hint iterators1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 #[test]
 fn main() {
     let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
 
-    let mut my_iterable_fav_fruits = ???;   // TODO: Step 1
+    let mut my_iterable_fav_fruits = my_fav_fruits.iter();   // TODO: Step 1
 
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"banana"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 2
+    assert_eq!(my_iterable_fav_fruits.next(), Some(&"custard apple"));     // TODO: Step 2
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"avocado"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 3
+    assert_eq!(my_iterable_fav_fruits.next(), Some(&"peach"));     // TODO: Step 3
     assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 4
+    assert_eq!(my_iterable_fav_fruits.next(), None);     // TODO: Step 4
 }

exercises/iterators/iterators2.rs

@@ -6,7 +6,7 @@
 // Execute `rustlings hint iterators2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 // Step 1.
 // Complete the `capitalize_first` function.
@@ -15,7 +15,13 @@ pub fn capitalize_first(input: &str) -> String {
     let mut c = input.chars();
     match c.next() {
         None => String::new(),
-        Some(first) => ???,
+        Some(first) => {
+            let mut s = first.to_uppercase().to_string();
+            while let Some(v) = c.next() {
+                s.push(v);
+            }
+            s
+        }
     }
 }
 
@@ -24,7 +30,11 @@ pub fn capitalize_first(input: &str) -> String {
 // Return a vector of strings.
 // ["hello", "world"] -> ["Hello", "World"]
 pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
-    vec![]
+    let mut out: Vec<String> = vec![];
+    for v in words {
+        out.push(capitalize_first(v));
+    }
+    out
 }
 
 // Step 3.
@@ -32,7 +42,11 @@ pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
 // Return a single string.
 // ["hello", " ", "world"] -> "Hello World"
 pub fn capitalize_words_string(words: &[&str]) -> String {
-    String::new()
+    let mut out = String::new();
+    for v in words {
+        out.push_str(&capitalize_first(v));
+    }
+    out
 }
 
 #[cfg(test)]

exercises/iterators/iterators3.rs

@@ -9,7 +9,7 @@
 // Execute `rustlings hint iterators3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum DivisionError {
@@ -26,23 +26,33 @@ pub struct NotDivisibleError {
 // Calculate `a` divided by `b` if `a` is evenly divisible by `b`.
 // Otherwise, return a suitable error.
 pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
-    todo!();
+    if b == 0 {
+        return Err(DivisionError::DivideByZero);
+    }
+
+    if a % b == 0 {
+        Ok(a/b)
+    } else {
+        Err(DivisionError::NotDivisible(NotDivisibleError { dividend: a, divisor: b }))
+    }
 }
 
 // Complete the function and return a value of the correct type so the test
 // passes.
 // Desired output: Ok([1, 11, 1426, 3])
-fn result_with_list() -> () {
+fn result_with_list() -> Result<Vec<i32>, DivisionError> {
     let numbers = vec![27, 297, 38502, 81];
-    let division_results = numbers.into_iter().map(|n| divide(n, 27));
+    let division_results = numbers.into_iter().map(|n| divide(n, 27)).flatten().collect::<Vec<_>>();
+    Ok(division_results)
 }
 
 // Complete the function and return a value of the correct type so the test
 // passes.
 // Desired output: [Ok(1), Ok(11), Ok(1426), Ok(3)]
-fn list_of_results() -> () {
+fn list_of_results() -> Vec<Result<i32, DivisionError>> {
     let numbers = vec![27, 297, 38502, 81];
-    let division_results = numbers.into_iter().map(|n| divide(n, 27));
+    let division_results = numbers.into_iter().map(|n| divide(n, 27)).collect::<Vec<_>>();
+    division_results
 }
 
 #[cfg(test)]

exercises/iterators/iterators4.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint iterators4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 pub fn factorial(num: u64) -> u64 {
     // Complete this function to return the factorial of num
@@ -15,6 +15,11 @@ pub fn factorial(num: u64) -> u64 {
     // For an extra challenge, don't use:
     // - recursion
     // Execute `rustlings hint iterators4` for hints.
+    match num {
+        0 => 1,
+        1 => 1,
+        _ => factorial(num - 1) * num
+    }
 }
 
 #[cfg(test)]

exercises/iterators/iterators5.rs

@@ -11,7 +11,7 @@
 // Execute `rustlings hint iterators5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 use std::collections::HashMap;
 
@@ -35,7 +35,8 @@ fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
 fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
     // map is a hashmap with String keys and Progress values.
     // map = { "variables1": Complete, "from_str": None, ... }
-    todo!();
+    //todo!();
+    map.iter().filter(|(_, v)| **v == value ).collect::<Vec<_>>().len()
 }
 
 fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
@@ -54,7 +55,8 @@ fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Pr
     // collection is a slice of hashmaps.
     // collection = [{ "variables1": Complete, "from_str": None, ... },
     //     { "variables2": Complete, ... }, ... ]
-    todo!();
+    //todo!();
+    collection.iter().flatten().filter(|(_, v)| **v == value ).collect::<Vec<_>>().len()
 }
 
 #[cfg(test)]

exercises/macros/macros1.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint macros1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 macro_rules! my_macro {
     () => {
@@ -12,5 +12,5 @@ macro_rules! my_macro {
 }
 
 fn main() {
-    my_macro();
+    my_macro!();
 }

exercises/macros/macros2.rs

@@ -3,12 +3,13 @@
 // Execute `rustlings hint macros2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn main() {
     my_macro!();
 }
 
+#[macro_export]
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");

exercises/macros/macros3.rs

@@ -5,9 +5,10 @@
 // Execute `rustlings hint macros3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 mod macros {
+    #[macro_export]
     macro_rules! my_macro {
         () => {
             println!("Check out my macro!");

exercises/macros/macros4.rs

@@ -3,15 +3,15 @@
 // Execute `rustlings hint macros4` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 #[rustfmt::skip]
 macro_rules! my_macro {
     () => {
-        println!("Check out my macro!");
-    }
+        println!("Check out my macro!")
+    };
     ($val:expr) => {
-        println!("Look at this other macro: {}", $val);
+        println!("Look at this other macro: {}", $val)
     }
 }
 

exercises/smart_pointers/arc1.rs

@@ -21,7 +21,7 @@
 //
 // Execute `rustlings hint arc1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
+
 
 #![forbid(unused_imports)] // Do not change this, (or the next) line.
 use std::sync::Arc;
@@ -29,11 +29,11 @@ use std::thread;
 
 fn main() {
     let numbers: Vec<_> = (0..100u32).collect();
-    let shared_numbers = // TODO
+    let shared_numbers = Arc::new(numbers);
     let mut joinhandles = Vec::new();
 
     for offset in 0..8 {
-        let child_numbers = // TODO
+        let child_numbers = shared_numbers.clone();
         joinhandles.push(thread::spawn(move || {
             let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
             println!("Sum of offset {} is {}", offset, sum);

exercises/smart_pointers/box1.rs

@@ -18,11 +18,11 @@
 //
 // Execute `rustlings hint box1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
+
 
 #[derive(PartialEq, Debug)]
 pub enum List {
-    Cons(i32, List),
+    Cons(i32, Box<List>),
     Nil,
 }
 
@@ -35,11 +35,13 @@ fn main() {
 }
 
 pub fn create_empty_list() -> List {
-    todo!()
+    //todo!()
+    List::Nil
 }
 
 pub fn create_non_empty_list() -> List {
-    todo!()
+    //todo!()
+    List::Cons(1, Box::new(create_empty_list()))
 }
 
 #[cfg(test)]

exercises/smart_pointers/cow1.rs

@@ -12,7 +12,7 @@
 //
 // Execute `rustlings hint cow1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
+
 
 use std::borrow::Cow;
 
@@ -48,7 +48,8 @@ mod tests {
         let slice = [0, 1, 2];
         let mut input = Cow::from(&slice[..]);
         match abs_all(&mut input) {
-            // TODO
+            Cow::Borrowed(_) => Ok(()),
+            _ => Err("Expected owned value"),
         }
     }
 
@@ -60,7 +61,8 @@ mod tests {
         let slice = vec![0, 1, 2];
         let mut input = Cow::from(slice);
         match abs_all(&mut input) {
-            // TODO
+            Cow::Owned(_) => Ok(()),
+            _ => Err("Expected owned value"),
         }
     }
 
@@ -72,7 +74,8 @@ mod tests {
         let slice = vec![-1, 0, 1];
         let mut input = Cow::from(slice);
         match abs_all(&mut input) {
-            // TODO
+            Cow::Owned(_) => Ok(()),
+            _ => Err("Expected owned value"),
         }
     }
 }

exercises/smart_pointers/rc1.rs

@@ -10,7 +10,7 @@
 //
 // Execute `rustlings hint rc1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
+
 
 use std::rc::Rc;
 
@@ -61,17 +61,17 @@ fn main() {
     jupiter.details();
 
     // TODO
-    let saturn = Planet::Saturn(Rc::new(Sun {}));
+    let saturn = Planet::Saturn(sun.clone());
     println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
     saturn.details();
 
     // TODO
-    let uranus = Planet::Uranus(Rc::new(Sun {}));
+    let uranus = Planet::Uranus(sun.clone());
     println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
     uranus.details();
 
     // TODO
-    let neptune = Planet::Neptune(Rc::new(Sun {}));
+    let neptune = Planet::Neptune(sun.clone());
     println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
     neptune.details();
 
@@ -93,12 +93,15 @@ fn main() {
     println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
 
     // TODO
+    drop(earth);
     println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
 
     // TODO
+    drop(venus);
     println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
 
     // TODO
+    drop(mercury);
     println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
 
     assert_eq!(Rc::strong_count(&sun), 1);

exercises/threads/threads1.rs

@@ -8,7 +8,7 @@
 // Execute `rustlings hint threads1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 use std::thread;
 use std::time::{Duration, Instant};
@@ -27,6 +27,7 @@ fn main() {
     let mut results: Vec<u128> = vec![];
     for handle in handles {
         // TODO: a struct is returned from thread::spawn, can you use it?
+        results.push(handle.join().unwrap());
     }
 
     if results.len() != 10 {

exercises/threads/threads2.rs

@@ -7,25 +7,26 @@
 // Execute `rustlings hint threads2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 use std::sync::Arc;
 use std::thread;
 use std::time::Duration;
+use std::sync::RwLock;
 
 struct JobStatus {
-    jobs_completed: u32,
+    jobs_completed: RwLock<u32>,
 }
 
 fn main() {
-    let status = Arc::new(JobStatus { jobs_completed: 0 });
+    let status = Arc::new(JobStatus { jobs_completed: RwLock::new(0) });
     let mut handles = vec![];
     for _ in 0..10 {
         let status_shared = Arc::clone(&status);
         let handle = thread::spawn(move || {
             thread::sleep(Duration::from_millis(250));
             // TODO: You must take an action before you update a shared value
-            status_shared.jobs_completed += 1;
+            *(status_shared.jobs_completed.write().unwrap()) += 1;
         });
         handles.push(handle);
     }
@@ -34,6 +35,6 @@ fn main() {
         // TODO: Print the value of the JobStatus.jobs_completed. Did you notice
         // anything interesting in the output? Do you have to 'join' on all the
         // handles?
-        println!("jobs completed {}", ???);
+        println!("jobs completed {}", status.jobs_completed.read().unwrap());
     }
 }

exercises/threads/threads3.rs

@@ -3,7 +3,7 @@
 // Execute `rustlings hint threads3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 use std::sync::mpsc;
 use std::sync::Arc;
@@ -31,6 +31,8 @@ fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
     let qc1 = Arc::clone(&qc);
     let qc2 = Arc::clone(&qc);
 
+    let tx2 = tx.clone();
+
     thread::spawn(move || {
         for val in &qc1.first_half {
             println!("sending {:?}", val);
@@ -42,7 +44,7 @@ fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
     thread::spawn(move || {
         for val in &qc2.second_half {
             println!("sending {:?}", val);
-            tx.send(*val).unwrap();
+            tx2.send(*val).unwrap();
             thread::sleep(Duration::from_secs(1));
         }
     });