🚧 temp save

exercises/19_smart_pointers/cow1.rs

@@ -12,8 +12,6 @@
 //
 // Execute `rustlings hint cow1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 use std::borrow::Cow;
 
 fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {

exercises/20_threads/threads1.rs

@@ -8,7 +8,6 @@
 // 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 +26,7 @@ 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/20_threads/threads2.rs

@@ -7,9 +7,9 @@
 // Execute `rustlings hint threads2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
-use std::sync::Arc;
+use std::borrow::BorrowMut;
+use std::sync::{Arc, Mutex};
 use std::thread;
 use std::time::Duration;
 
@@ -18,14 +18,16 @@ struct JobStatus {
 }
 
 fn main() {
-    let status = Arc::new(JobStatus { jobs_completed: 0 });
+    let status = Arc::new(Mutex::new(JobStatus { jobs_completed: 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.lock().unwrap().jobs_completed += 1;
+            // status_shared.borrow_mut().jobs_completed += 1;
+            // status_shared.jobs_completed += 1;
         });
         handles.push(handle);
     }
@@ -34,6 +36,6 @@ 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.lock().unwrap().jobs_completed);
     }
 }

exercises/20_threads/threads3.rs

@@ -3,10 +3,8 @@
 // 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;
 use std::thread;
 use std::time::Duration;
 
@@ -27,18 +25,19 @@ impl Queue {
 }
 
 fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
+    let tx2 = tx.clone();
     thread::spawn(move || {
         for val in q.first_half {
             println!("sending {:?}", val);
-            tx.send(val).unwrap();
+            tx.clone().send(val).unwrap();
             thread::sleep(Duration::from_secs(1));
         }
     });
 
-    thread::spawn(move || {
+    thread::spawn( move|| {
         for val in q.second_half {
             println!("sending {:?}", val);
-            tx.send(val).unwrap();
+            tx2.clone().send(val).unwrap();
             thread::sleep(Duration::from_secs(1));
         }
     });

exercises/21_macros/macros1.rs

@@ -3,7 +3,6 @@
 // Execute `rustlings hint macros1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 macro_rules! my_macro {
     () => {
@@ -12,5 +11,5 @@ macro_rules! my_macro {
 }
 
 fn main() {
-    my_macro();
+    my_macro!();
 }

exercises/21_macros/macros2.rs

@@ -3,14 +3,14 @@
 // Execute `rustlings hint macros2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
-fn main() {
-    my_macro!();
-}
 
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
     };
 }
+
+fn main() {
+    my_macro!();
+}

exercises/21_macros/macros3.rs

@@ -5,9 +5,9 @@
 // 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/21_macros/macros4.rs

@@ -3,13 +3,12 @@
 // 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!");
-    }
+    };
     ($val:expr) => {
         println!("Look at this other macro: {}", $val);
     }

exercises/22_clippy/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "clippy3"
+version = "0.0.1"

exercises/22_clippy/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "clippy3"
+version = "0.0.1"
+edition = "2021"
+[[bin]]
+name = "clippy3"
+path = "clippy3.rs"

exercises/22_clippy/clippy1.rs

@@ -9,12 +9,10 @@
 // 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/22_clippy/clippy2.rs

@@ -3,12 +3,11 @@
 // 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 {
+    if let Some(x) = option{
         res += x;
     }
     println!("{}", res);

exercises/22_clippy/clippy3.rs

@@ -3,28 +3,30 @@
 // 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();
+    if my_option.is_some() {
+        println!("There's something!");
+    } else {
+        println!("There's nothing!");
     }
 
     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);
-    println!("This Vec is empty, see? {:?}", my_empty_vec);
+    vec![1, 2, 3, 4, 5].resize(0, 5);
+    println!("This Vec is empty, see? {:?}", ());
 
     let mut value_a = 45;
     let mut value_b = 66;
     // Let's swap these two!
-    value_a = value_b;
-    value_b = value_a;
+    std::mem::swap(&mut value_a, &mut value_b);
+    // value_a = value_b;
+    // value_b = value_a;
     println!("value a: {}; value b: {}", value_a, value_b);
 }

exercises/23_conversions/as_ref_mut.rs

@@ -9,23 +9,31 @@
 
 // I AM NOT DONE
 
+use std::ops::Mul;
+
 // 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>(arg: T) -> usize 
+where T: AsRef<str>
+{
     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>(arg: T) -> usize 
+where T: AsRef<str>
+{
     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>(arg: &mut T) 
+where T: for<'a> AsMut<&'a mut Box<u32>> + for<'a> Mul<&'a mut T, Output = T>// + std::ops::MulAssign<&mut Box<u32>>
+{
     // TODO: Implement the function body.
-    ???
+    *arg = (*arg) * arg;
 }
 
 #[cfg(test)]

exercises/23_conversions/from_into.rs

@@ -24,7 +24,6 @@ impl Default for Person {
     }
 }
 
-
 // Your task is to complete this implementation in order for the line `let p1 =
 // Person::from("Mark,20")` to compile. Please note that you'll need to parse the
 // age component into a `usize` with something like `"4".parse::<usize>()`. The
@@ -41,10 +40,24 @@ 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 {}
+    fn from(s: &str) -> Person {
+        if s.len() == 0 {
+            return Person::default();
+        }
+        let fields = s.split(',').collect::<Vec<&str>>();
+        if fields.len() != 2 {
+            return Person::default();
+        }
+        let name = fields[0].trim().to_string();
+        if name.len() == 0 {
+            return Person::default();
+        }
+        match fields[1].trim().parse::<usize>() {
+            Err(_) => Person::default(),
+            Ok(age) => Person { name, age },
+        }
+    }
 }
 
 fn main() {

exercises/23_conversions/from_str.rs

@@ -31,8 +31,6 @@ enum ParsePersonError {
     ParseInt(ParseIntError),
 }
 
-// I AM NOT DONE
-
 // Steps:
 // 1. If the length of the provided string is 0, an error should be returned
 // 2. Split the given string on the commas present in it
@@ -52,6 +50,22 @@ 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 fields = s.split(',').collect::<Vec<&str>>();
+        if fields.len() != 2 {
+            return Err(ParsePersonError::BadLen);
+        }
+        let name = fields[0].trim().to_string();
+        if name.len() == 0 {
+            return Err(ParsePersonError::NoName);
+        }
+        let age = fields[1].trim().parse::<usize>().map_err(ParsePersonError::ParseInt)?;
+        Ok(Person{
+            name,
+            age,
+        })
     }
 }
 

exercises/23_conversions/try_from_into.rs

@@ -27,8 +27,6 @@ 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
 // integers, an array of three integers, and a slice of integers.
@@ -37,17 +35,35 @@ enum IntoColorError {
 // time, but the slice implementation needs to check the slice length! Also note
 // that correct RGB color values must be integers in the 0..=255 range.
 
+fn convert_to_u8<T> (value: T) -> Result<u8, IntoColorError> 
+    where T: TryInto<u8>
+{
+    Ok(value.try_into().or(Err(IntoColorError::IntConversion))?)
+}
+
 // Tuple implementation
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        Ok(Color {
+            red: convert_to_u8(tuple.0)?,
+            green: convert_to_u8(tuple.1)?,
+            blue: convert_to_u8(tuple.2)?,
+        })
     }
 }
 
 // Array implementation
-impl TryFrom<[i16; 3]> for Color {
+impl<T> TryFrom<[T; 3]> for Color 
+where T: TryInto<u8> + Copy
+{
     type Error = IntoColorError;
-    fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+    fn try_from(arr: [T; 3]) -> Result<Self, Self::Error> {
+        Ok(Color {
+            red: convert_to_u8(arr[0])?,
+            green: convert_to_u8(arr[1])?,
+            blue: convert_to_u8(arr[2])?,
+        })
     }
 }
 
@@ -55,6 +71,14 @@ 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);
+        }
+        Ok(Color {
+            red: convert_to_u8(slice[0])?,
+            green: convert_to_u8(slice[1])?,
+            blue: convert_to_u8(slice[2])?,
+        })
     }
 }
 

exercises/23_conversions/using_as.rs

@@ -10,11 +10,10 @@
 // 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() {