Ejercicios 94/94

exercises/conversions/as_ref_mut.rs

@@ -3,25 +3,19 @@
 // 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) {
-    // TODO: Implement the function body.
-    ???
+fn num_sq<T: AsMut<u32>>(arg: &mut T) {
+    *arg.as_mut() = *arg.as_mut() * *arg.as_mut();
 }
 
 #[cfg(test)]

exercises/conversions/from_into.rs

@@ -35,10 +35,16 @@ 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 vec: Vec<&str> = s.split(",").collect();
+        let name = vec[0].trim(); 
+        let age = vec[vec.len() - 1].parse::<usize>();
+        if vec.len() == 2 && name.len() > 0 && age.is_ok() {
+            Person { name: name.to_string(), age: age.unwrap() }
+        } else {
+            Person::default()
+        }
     }
 }
 

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 +44,22 @@ enum ParsePersonError {
 impl FromStr for Person {
     type Err = ParsePersonError;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        let vec: Vec<&str> = s.split(",").collect();
+        let name = vec[0].trim(); 
+        let age = vec[vec.len() - 1].parse::<usize>();
+        if vec.len() == 2 && name.len() > 0 && age.is_ok() {
+            Ok(Person { name: name.to_string(), age: age.unwrap() })
+        } else {
+            if s.trim().len() == 0 {
+                Err(ParsePersonError::Empty)
+            } else if vec.len() != 2 {
+                Err(ParsePersonError::BadLen)
+            } else if name.len() == 0 {
+                Err(ParsePersonError::NoName)
+            } else {
+                Err(ParsePersonError::ParseInt(age.unwrap_err()))
+            }
+        }
     }
 }
 

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,
@@ -34,10 +32,30 @@ enum IntoColorError {
 // 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 into_color(collection: Vec<i16>) -> Result<Color, IntoColorError> {
+    let mut color = Color {red: 0, green: 0, blue: 0};
+    if collection.len() < 3 { return Err(IntoColorError::BadLen) }
+    for (i, num) in collection.iter().enumerate() {
+        if *num >= 0 && *num <= 255 {
+            let val = *num as u8;
+            match i {
+                0 => color.red = val,
+                1 => color.green = val,
+                2 => color.blue = val,
+                _ => return Err(IntoColorError::BadLen),
+            }
+        } else {
+            return Err(IntoColorError::IntConversion);
+        }
+    }
+    Ok(color)
+}
+
 // Tuple implementation
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        into_color(vec![tuple.0, tuple.1, tuple.2])
     }
 }
 
@@ -45,6 +63,7 @@ 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> {
+        into_color(arr.to_vec())
     }
 }
 
@@ -52,6 +71,7 @@ impl TryFrom<[i16; 3]> for Color {
 impl TryFrom<&[i16]> for Color {
     type Error = IntoColorError;
     fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
+        into_color(slice.to_vec())
     }
 }
 

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() {