Finished Rustlings

exercises/conversions/as_ref_mut.rs

@@ -3,25 +3,24 @@
 // 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 {
+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();
 }
 
 #[cfg(test)]

exercises/conversions/try_from_into.rs

@@ -23,7 +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.
@@ -38,6 +37,10 @@ enum IntoColorError {
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        match tuple {
+            (0..=255, 0..=255, 0..=255) => (),
+            _ => { return Err(IntoColorError::IntConversion); }
+        }
         Ok(Color {
             red: tuple.0 as u8,
             green: tuple.1 as u8,
@@ -50,6 +53,12 @@ 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> {
+        for value in arr {
+            match value {
+                0..=255 => (),
+                _ => { return Err(IntoColorError::IntConversion); }
+            }
+        }
         Ok(Color {
             red: arr[0] as u8,
             green: arr[1] as u8,
@@ -62,7 +71,18 @@ impl TryFrom<[i16; 3]> for Color {
 impl TryFrom<&[i16]> for Color {
     type Error = IntoColorError;
     fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
-        todo!();
+        if slice.len() != 3 { return Err(IntoColorError::BadLen); }
+        for value in slice {
+            match value {
+                0..=255 => (),
+                _ => { return Err(IntoColorError::IntConversion); }
+            }
+        }
+        Ok(Color {
+            red: slice[0] as u8,
+            green: slice[1] as u8,
+            blue: slice[2] as u8,
+        })
     }
 }