gitignore updates

.gitignore

@@ -11,3 +11,5 @@ rust-project.json
 !.vscode/extensions.json
 *.iml
 *.o
+
+REVISITS.md

REVISITS.md

@@ -34,7 +34,16 @@ return results to new Vec<i32> vector
 35) All threads exercises :(. handles and join methods for thread completion wait in the main thread.
 36) threads2 exercises important for understanding synchorization primitize Mutex
 37) threads3  - again - all threads exercises.
-38) all macros exercises
+38) all macros 
+39) Conversions from_str be sure to understand map_err() for error projection!
+40) All conversions man: 
+    ```let mut x = 5;
+    let x_ref = &mut x;
 
-conversions
+    let x_ref2 = x_ref.as_mut(); // convert to mutable reference
+
+    *x_ref2 = 10; // modify the value
+
+    assert_eq!(x, 10);
+    In this example, x_ref is a mutable reference to x. We can use the as_mut method to convert x_ref to a mutable reference, which we store in x_ref2. We can then use x_ref2 to modify the value of x.```
 

exercises/conversions/as_ref_mut.rs

@@ -3,25 +3,26 @@
 // and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
 // 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 {
-    arg.as_ref().as_bytes().len()
+fn byte_counter<T: AsRef<[u8]>>(arg: T) -> usize {
+    arg.as_ref().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>(arg: &mut T) 
+where 
+    T: AsMut<u32>,
+{
     // TODO: Implement the function body.
-    ???
+    *arg.as_mut() *= *arg.as_mut();
 }
 
 #[cfg(test)]

exercises/conversions/from_str.rs

@@ -28,8 +28,6 @@ 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
@@ -46,9 +44,31 @@ enum ParsePersonError {
 impl FromStr for Person {
     type Err = ParsePersonError;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        if s.is_empty() {
+            return Err(ParsePersonError::Empty);
+        } else {
+            let mycollection: Vec<&str> = s.split(",").collect();
+
+            if mycollection[0].is_empty() {
+                return Err(ParsePersonError::NoName);
+            } else if mycollection.len() != 2 {
+                return Err(ParsePersonError::BadLen);
+            } else {
+                let myage = mycollection[1].parse::<usize>().map_err(ParsePersonError::ParseInt)?;
+                let myname = mycollection[0].to_string();
+
+              
+                Ok(Person{
+                        age: myage,
+                        name: myname
+                })
             }
         }
 
+        }
+        
+    }
+
 fn main() {
     let p = "Mark,20".parse::<Person>().unwrap();
     println!("{:?}", p);

exercises/conversions/try_from_into.rs

@@ -23,8 +23,6 @@ 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,
@@ -38,6 +36,23 @@ 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 < 0 || tuple.0 > 255 ||
+            tuple.1 < 0 || tuple.1 > 255 ||
+                tuple.2 < 0 || tuple.2 > 255 {
+                    return Err(IntoColorError::IntConversion);
+                } else {
+                    Ok(Color{
+                        red: tuple.0 as u8,
+                        green: tuple.1 as u8,
+                        blue: tuple.2 as u8
+                    })
+                }
+
+        
+
     }
 }
 
@@ -45,6 +60,18 @@ 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] < 0 || arr[0] > 255 ||
+            arr[1] < 0 || arr[1] > 255 ||
+                arr[2] < 0 || arr[1] > 255 {
+                    return Err(IntoColorError::IntConversion);
+                } else {
+                    Ok(Color{
+                        red:arr[0] as u8,
+                        green:arr[1] as u8,
+                        blue: arr[2] as u8
+                    })
+                }
     }
 }
 
@@ -52,6 +79,20 @@ 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);
+        } else if slice[0] < 0 || slice[0] > 255 ||
+            slice[1] < 0 || slice[1] > 255 || 
+                slice[2] < 0 || slice[2] > 255 {
+                    return Err(IntoColorError::IntConversion)
+        } else {
+            Ok(Color{
+                red: slice[0] as u8,
+                green: slice[1] as u8,
+                blue: slice[2] as u8
+            })
+        }
     }
 }