update

Author: wauxing

exercises/conversions/as_ref_mut.rs

@@ -7,25 +7,26 @@
 // 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.
-    ???
+    let num : &mut u32 = arg.as_mut();
+    *num = *num * *num;
 }
 
 #[cfg(test)]

exercises/conversions/from_str.rs

@@ -31,7 +31,7 @@ enum ParsePersonError {
     ParseInt(ParseIntError),
 }
 
-// I AM NOT DONE
+
 
 // Steps:
 // 1. If the length of the provided string is 0, an error should be returned
@@ -52,6 +52,37 @@ enum ParsePersonError {
 impl FromStr for Person {
     type Err = ParsePersonError;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        if s.is_empty(){
+            return Err(Self::Err::Empty);
+        }
+
+        let parts :Vec<&str> = s.split(',').collect();
+        if parts.len() !=2{
+            return Err(Self::Err::BadLen);
+        }
+
+        let name = match parts.get(0){
+            Some(name) => {
+                let n = (*name).trim();
+                if n.is_empty(){
+                    return Err(Self::Err::NoName);
+                }
+                n
+            },
+            None => return Err(Self::Err::NoName),
+        };
+
+        let age =  match parts.get(1){
+            Some(age) => match age.parse::<usize>(){
+                Ok(age) => age,
+                Err(e) => return Err(Self::Err::ParseInt(e)),
+            },
+            None => return Err(Self::Err::BadLen),
+        };
+        Ok(Person{
+            name : String::from(name),
+            age
+        })
     }
 }
 

exercises/conversions/try_from_into.rs

@@ -27,7 +27,7 @@ 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
@@ -41,20 +41,82 @@ enum IntoColorError {
 impl TryFrom<(i16, i16, i16)> for Color {
     type Error = IntoColorError;
     fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        let red : u8  = match tuple.0.try_into(){
+            Ok(red) => red,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        let green:u8 = match tuple.1.try_into(){
+            Ok(green) => green,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        let blue :u8 = match tuple.2.try_into(){
+            Ok(blue) => blue,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        Ok(
+            Color{
+                red,
+                green,
+                blue
+            }
+        )
+
     }
 }
 
 // Array implementation
 impl TryFrom<[i16; 3]> for Color {
     type Error = IntoColorError;
     fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+        let red : u8  = match arr[0].try_into(){
+            Ok(red) => red,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        let green:u8 = match arr[1].try_into(){
+            Ok(green) => green,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        let blue :u8 = match arr[2].try_into(){
+            Ok(blue) => blue,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        Ok(
+            Color{
+                red,
+                green,
+                blue
+            }
+        )
     }
 }
 
 // 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(Self::Error::BadLen);
+        }
+        let red : u8  = match slice[0].try_into(){
+            Ok(red) => red,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        let green:u8 = match slice[1].try_into(){
+            Ok(green) => green,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        let blue :u8 = match slice[2].try_into(){
+            Ok(blue) => blue,
+            Err(_) => return Err(Self::Error::IntConversion),
+        };
+        Ok(
+            Color{
+                red,
+                green,
+                blue
+            }
+        )
+
     }
 }
 

exercises/tests/Cargo.lock

@@ -0,0 +1,7 @@
+[package]
+name = "tests8"
+version = "0.0.1"
+edition = "2021"
+[[bin]]
+name = "tests8"
+path = "tests8.rs"

exercises/tests/Cargo.toml

@@ -11,14 +11,14 @@ fn main() {
         .unwrap()
         .as_secs(); // What's the use of this timestamp here?
     let your_command = format!(
-        "Your command here with {}, please checkout exercises/tests/build.rs",
+        "rustc-env=TEST_FOO={}",
         timestamp
     );
     println!("cargo:{}", your_command);
 
     // In tests8, we should enable "pass" feature to make the
     // testcase return early. Fill in the command to tell
     // Cargo about that.
-    let your_command = "Your command here, please checkout exercises/tests/build.rs";
+    let your_command = "rustc-cfg=feature=\"pass\"";
     println!("cargo:{}", your_command);
 }

exercises/tests/build.rs

@@ -22,7 +22,7 @@
 // Execute `rustlings hint tests5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 /// # Safety
 ///
@@ -32,7 +32,7 @@ unsafe fn modify_by_address(address: usize) {
     // code's behavior and the contract of this function. You may use the
     // comment of the test below as your format reference.
     unsafe {
-        todo!("Your code goes here")
+        *(address as * mut u32 ) = 0xAABBCCDD;
     }
 }
 

exercises/tests/tests5.rs

@@ -7,7 +7,6 @@
 // Execute `rustlings hint tests6` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 struct Foo {
     a: u128,
@@ -20,8 +19,9 @@ struct Foo {
 unsafe fn raw_pointer_to_box(ptr: *mut Foo) -> Box<Foo> {
     // SAFETY: The `ptr` contains an owned box of `Foo` by contract. We
     // simply reconstruct the box from that pointer.
-    let mut ret: Box<Foo> = unsafe { ??? };
-    todo!("The rest of the code goes here")
+    let mut ret: Box<Foo> = unsafe {Box::from_raw(ptr)};
+    ret.b = Some(String::from("hello"));
+    ret
 }
 
 #[cfg(test)]

exercises/tests/tests6.rs

@@ -34,7 +34,7 @@
 // Execute `rustlings hint tests7` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn main() {}
 

exercises/tests/tests7.rs

@@ -7,7 +7,7 @@
 // Execute `rustlings hint tests8` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
+
 
 fn main() {}