solve 19 tests

Author: hellolutar

exercises/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/clippy/clippy2.rs

@@ -1,14 +1,12 @@
 // clippy2.rs
-// 
+//
 // 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 {
+    while let Some(x) = option {
         res += x;
     }
     println!("{}", res);

exercises/clippy/clippy3.rs

@@ -1,31 +1,27 @@
 // clippy3.rs
-// 
+//
 // Here's a couple more easy Clippy fixes, so you can see its utility.
 //
 // Execute `rustlings hint clippy3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 #[allow(unused_variables, unused_assignments)]
 fn main() {
     let my_option: Option<()> = None;
-    if my_option.is_none() {
-        my_option.unwrap();
-    }
 
+    #[rustfmt::skip]
     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);
+    let mut my_empty_vec = vec![1, 2, 3, 4, 5];
+    my_empty_vec.clear();
     println!("This Vec is empty, see? {:?}", my_empty_vec);
 
     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);
     println!("value a: {}; value b: {}", value_a, value_b);
 }

exercises/conversions/as_ref_mut.rs

@@ -7,25 +7,23 @@
 // 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/from_into.rs

@@ -40,10 +40,27 @@ 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 mut ret = Person::default();
+        if s.len() == 0 {
+            return ret;
+        }
+        let items: Vec<&str> = s.split(",").collect();
+        if items.len()!=2 {
+            return ret;
+        }
+        let name = items[0].to_string();
+        if name.len() == 0 {
+            return ret;
+        }
+        let age_result = items[1].parse::<usize>();
+        match age_result {
+            Ok(age) => ret.age = age,
+            Err(_) => return ret,
+        }
+        ret.name = name;
+        ret
     }
 }
 

exercises/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 +50,27 @@ 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 items: Vec<&str> = s.split(",").collect();
+        if items.len() != 2 {
+            return Err(ParsePersonError::BadLen);
+        }
+        let name = items[0].to_string();
+        if name.len() == 0 {
+            return Err(ParsePersonError::NoName);
+        }
+        let age_result = items[1].parse::<usize>();
+        let mut age: usize = 0;
+        match age_result {
+            Ok(x) => age = x,
+            Err(x) => return Err(ParsePersonError::ParseInt(x)),
+        }
+        Ok(Person {
+            name: name,
+            age: age,
+        })
     }
 }
 

exercises/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.
@@ -41,20 +39,36 @@ 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);
+            }
+        }
+        return Ok(Color {
+            red: tuple.0 as u8,
+            green: tuple.1 as u8,
+            blue: tuple.2 as u8,
+        });
     }
 }
 
 // Array implementation
 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]))
     }
 }
 
 // Slice implementation
 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 {
+            return Color::try_from((slice[0], slice[1], slice[2]));
+        }
     }
 }
 

exercises/conversions/using_as.rs

@@ -10,11 +10,9 @@
 // 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() {

exercises/macros/macros1.rs

@@ -3,14 +3,12 @@
 // Execute `rustlings hint macros1` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
     };
 }
 
 fn main() {
-    my_macro();
+    my_macro!();
 }

exercises/macros/macros2.rs

@@ -3,14 +3,12 @@
 // 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!();
+}