conversions

exercises/conversions/as_ref_mut.rs

@@ -3,24 +3,22 @@
 // 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
 // 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()
 }
 
 // Squares a number using as_mut(). Add the trait bound as is appropriate and
 // implement the function body.
-fn num_sq<T>(arg: &mut T) {
-    ???
+fn num_sq<T: AsMut<u32>>(arg: &mut T) {
+    *arg.as_mut() *= *arg.as_mut()
 }
 
 #[cfg(test)]

exercises/conversions/from_into.rs

@@ -35,10 +35,35 @@ 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 {
+        if s == "" {
+            Person::default()
+        } else {
+            s.split(",")
+                .map(|x| x.into())
+                .collect::<Vec<String>>()
+                .into()
+        }
+    }
+}
+
+impl From<Vec<String>> for Person {
+    fn from(s: Vec<String>) -> Self {
+        if s.len() != 2 {
+            return Person::default();
+        }
+        let number = s[1].parse();
+        let age;
+        if number.is_err() || s[0] == "" {
+            Person::default()
+        } else {
+            age = number.unwrap();
+            Person {
+                name: s[0].clone(),
+                age: age,
+            }
+        }
     }
 }
 

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
@@ -46,6 +44,24 @@ enum ParsePersonError {
 impl FromStr for Person {
     type Err = ParsePersonError;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        if s == "" {
+            Err(ParsePersonError::Empty)
+        } else {
+            let s = s.split(",").map(|x| x.into()).collect::<Vec<String>>();
+            if s.len() != 2 {
+                return Err(ParsePersonError::BadLen);
+            } else if s[0] == "" {
+                return Err(ParsePersonError::NoName);
+            }
+            let number = s[1].parse();
+            if let Err(x) = number {
+                return Err(ParsePersonError::ParseInt(x));
+            }
+            Ok(Person {
+                name: s[0].clone(),
+                age: number.unwrap(),
+            })
+        }
     }
 }
 

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 +36,16 @@ enum IntoColorError {
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        for i in [tuple.0, tuple.1, tuple.2] {
+            if i < 0 || i > 255 {
+                return Err(IntoColorError::IntConversion);
+            }
+        }
+        Ok(Color {
+            red: tuple.0 as u8,
+            green: tuple.1 as u8,
+            blue: tuple.2 as u8,
+        })
     }
 }
 
@@ -45,6 +53,7 @@ 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> {
+        Color::try_from((arr[0], arr[1], arr[2]))
     }
 }
 
@@ -52,6 +61,11 @@ 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 {
+            Err(IntoColorError::BadLen)
+        } else {
+            Color::try_from((slice[0], slice[1], slice[2]))
+        }
     }
 }
 

exercises/conversions/using_as.rs

@@ -6,11 +6,9 @@
 // and returns the proper type.
 // 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() {