Finish Rustlings

]

@@ -0,0 +1,70 @@
+// iterators2.rs
+// In this exercise, you'll learn some of the unique advantages that iterators
+// can offer. Follow the steps to complete the exercise.
+// As always, there are hints if you execute `rustlings hint iterators2`!
+
+// I AM NOT DONE
+
+// Step 1.
+// Complete the `capitalize_first` function.
+// "hello" -> "Hello"
+fn main() {}
+
+pub fn capitalize_first(input: &str) -> String {
+    let mut c = input.chars();
+    match c.next() {
+        None => String::new(),
+        Some(last) => last.to_string().to_uppercase() + c.as_str(),
+    }
+}
+
+// Step 2.
+// Apply the `capitalize_first` function to a slice of string slices.
+// Return a vector of strings.
+// ["hello", "world"] -> ["Hello", "World"]
+pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
+    let mut final_words = vec![];
+    for word in words {
+        final_words.push(capitalize_first(word));
+    }
+    final_words
+}
+
+// Step 3.
+// Apply the `capitalize_first` function again to a slice of string slices.
+// Return a single string.
+// ["hello", " ", "world"] -> "Hello World"
+pub fn capitalize_words_string(words: &[&str]) -> String {
+    let mut return_string = String::new();
+    for word in words {
+        return_string.append(capitalize_first(word));
+    }
+    return_string
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_success() {
+        assert_eq!(capitalize_first("hello"), "Hello");
+    }
+
+    #[test]
+    fn test_empty() {
+        assert_eq!(capitalize_first(""), "");
+    }
+
+    #[test]
+    fn test_iterate_string_vec() {
+        let words = vec!["hello", "world"];
+        assert_eq!(capitalize_words_vector(&words), ["Hello", "World"]);
+    }
+
+    #[test]
+    fn test_iterate_into_string() {
+        let words = vec!["hello", " ", "world"];
+        assert_eq!(capitalize_words_string(&words), "Hello World");
+    }
+}

exercises/Cargo.lock

@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "exercises"
+version = "0.1.0"

exercises/Cargo.toml

@@ -0,0 +1,286 @@
+# This Cargo.toml is AUTOGENERATED, you shouldn't need to edit it.
+# The `rustling` commands do not rely on this manifest at all, its only purpose
+# is to help editors analyze your code.
+# To regenerate it, run `cargo generate-manifest`.
+[package]
+name = 'exercises'
+version = '0.1.0'
+edition = '2018'
+authors = ['The Rustlings Maintainers']
+publish = false
+
+[[bin]]
+name = 'clippy1'
+path = 'clippy/clippy1.rs'
+
+[[bin]]
+name = 'clippy2'
+path = 'clippy/clippy2.rs'
+
+[[bin]]
+name = 'as_ref_mut'
+path = 'conversions/as_ref_mut.rs'
+
+[[bin]]
+name = 'from_into'
+path = 'conversions/from_into.rs'
+
+[[bin]]
+name = 'from_str'
+path = 'conversions/from_str.rs'
+
+[[bin]]
+name = 'try_from_into'
+path = 'conversions/try_from_into.rs'
+
+[[bin]]
+name = 'using_as'
+path = 'conversions/using_as.rs'
+
+[[bin]]
+name = 'enums1'
+path = 'enums/enums1.rs'
+
+[[bin]]
+name = 'enums2'
+path = 'enums/enums2.rs'
+
+[[bin]]
+name = 'enums3'
+path = 'enums/enums3.rs'
+
+[[bin]]
+name = 'errors1'
+path = 'error_handling/errors1.rs'
+
+[[bin]]
+name = 'errors2'
+path = 'error_handling/errors2.rs'
+
+[[bin]]
+name = 'errors3'
+path = 'error_handling/errors3.rs'
+
+[[bin]]
+name = 'errorsn'
+path = 'error_handling/errorsn.rs'
+
+[[bin]]
+name = 'result1'
+path = 'error_handling/result1.rs'
+
+[[bin]]
+name = 'functions1'
+path = 'functions/functions1.rs'
+
+[[bin]]
+name = 'functions2'
+path = 'functions/functions2.rs'
+
+[[bin]]
+name = 'functions3'
+path = 'functions/functions3.rs'
+
+[[bin]]
+name = 'functions4'
+path = 'functions/functions4.rs'
+
+[[bin]]
+name = 'functions5'
+path = 'functions/functions5.rs'
+
+[[bin]]
+name = 'generics1'
+path = 'generics/generics1.rs'
+
+[[bin]]
+name = 'generics2'
+path = 'generics/generics2.rs'
+
+[[bin]]
+name = 'generics3'
+path = 'generics/generics3.rs'
+
+[[bin]]
+name = 'if1'
+path = 'if/if1.rs'
+
+[[bin]]
+name = 'if2'
+path = 'if/if2.rs'
+
+[[bin]]
+name = 'macros1'
+path = 'macros/macros1.rs'
+
+[[bin]]
+name = 'macros2'
+path = 'macros/macros2.rs'
+
+[[bin]]
+name = 'macros3'
+path = 'macros/macros3.rs'
+
+[[bin]]
+name = 'macros4'
+path = 'macros/macros4.rs'
+
+[[bin]]
+name = 'modules1'
+path = 'modules/modules1.rs'
+
+[[bin]]
+name = 'modules2'
+path = 'modules/modules2.rs'
+
+[[bin]]
+name = 'move_semantics1'
+path = 'move_semantics/move_semantics1.rs'
+
+[[bin]]
+name = 'move_semantics2'
+path = 'move_semantics/move_semantics2.rs'
+
+[[bin]]
+name = 'move_semantics3'
+path = 'move_semantics/move_semantics3.rs'
+
+[[bin]]
+name = 'move_semantics4'
+path = 'move_semantics/move_semantics4.rs'
+
+[[bin]]
+name = 'option1'
+path = 'option/option1.rs'
+
+[[bin]]
+name = 'option2'
+path = 'option/option2.rs'
+
+[[bin]]
+name = 'primitive_types1'
+path = 'primitive_types/primitive_types1.rs'
+
+[[bin]]
+name = 'primitive_types2'
+path = 'primitive_types/primitive_types2.rs'
+
+[[bin]]
+name = 'primitive_types3'
+path = 'primitive_types/primitive_types3.rs'
+
+[[bin]]
+name = 'primitive_types4'
+path = 'primitive_types/primitive_types4.rs'
+
+[[bin]]
+name = 'primitive_types5'
+path = 'primitive_types/primitive_types5.rs'
+
+[[bin]]
+name = 'primitive_types6'
+path = 'primitive_types/primitive_types6.rs'
+
+[[bin]]
+name = 'quiz1'
+path = 'quiz1.rs'
+
+[[bin]]
+name = 'quiz2'
+path = 'quiz2.rs'
+
+[[bin]]
+name = 'quiz3'
+path = 'quiz3.rs'
+
+[[bin]]
+name = 'quiz4'
+path = 'quiz4.rs'
+
+[[bin]]
+name = 'arc1'
+path = 'standard_library_types/arc1.rs'
+
+[[bin]]
+name = 'box1'
+path = 'standard_library_types/box1.rs'
+
+[[bin]]
+name = 'iterators2'
+path = 'standard_library_types/iterators2.rs'
+
+[[bin]]
+name = 'iterators3'
+path = 'standard_library_types/iterators3.rs'
+
+[[bin]]
+name = 'iterators4'
+path = 'standard_library_types/iterators4.rs'
+
+[[bin]]
+name = 'strings1'
+path = 'strings/strings1.rs'
+
+[[bin]]
+name = 'strings2'
+path = 'strings/strings2.rs'
+
+[[bin]]
+name = 'structs1'
+path = 'structs/structs1.rs'
+
+[[bin]]
+name = 'structs2'
+path = 'structs/structs2.rs'
+
+[[bin]]
+name = 'structs3'
+path = 'structs/structs3.rs'
+
+[[bin]]
+name = 'tests1'
+path = 'tests/tests1.rs'
+
+[[bin]]
+name = 'tests2'
+path = 'tests/tests2.rs'
+
+[[bin]]
+name = 'tests3'
+path = 'tests/tests3.rs'
+
+[[bin]]
+name = 'threads1'
+path = 'threads/threads1.rs'
+
+[[bin]]
+name = 'traits1'
+path = 'traits/traits1.rs'
+
+[[bin]]
+name = 'traits2'
+path = 'traits/traits2.rs'
+
+[[bin]]
+name = 'variables1'
+path = 'variables/variables1.rs'
+
+[[bin]]
+name = 'variables2'
+path = 'variables/variables2.rs'
+
+[[bin]]
+name = 'variables3'
+path = 'variables/variables3.rs'
+
+[[bin]]
+name = 'variables4'
+path = 'variables/variables4.rs'
+
+[[bin]]
+name = 'variables5'
+path = 'variables/variables5.rs'
+
+[[bin]]
+name = 'variables6'
+path = 'variables/variables6.rs'

exercises/clippy/clippy1.rs

@@ -6,12 +6,10 @@
 // check clippy's suggestions from the output to solve the exercise.
 // Execute `rustlings hint clippy1` for hints :)
 
-// I AM NOT DONE
-
 fn main() {
     let x = 1.2331f64;
     let y = 1.2332f64;
-    if y != x {
+    if (y - x).abs() > f64::MIN {
         println!("Success!");
     }
 }

exercises/clippy/clippy2.rs

@@ -1,12 +1,10 @@
 // clippy2.rs
 // Make me compile! Execute `rustlings hint clippy2` for hints :)
 
-// I AM NOT DONE
-
 fn main() {
     let mut res = 42;
     let option = Some(12);
-    for x in option {
+    if let Some(x) = option {
         res += x;
     }
     println!("{}", res);

exercises/collections/hashmap1.rs

@@ -11,15 +11,16 @@
 // Execute the command `rustlings hint hashmap1` if you need
 // hints.
 
-// I AM NOT DONE
 
 use std::collections::HashMap;
 
 fn fruit_basket() -> HashMap<String, u32> {
-    let mut basket = // TODO: declare your hash map here.
+    let mut basket = HashMap::new();
 
     // Two bananas are already given for you :)
     basket.insert(String::from("banana"), 2);
+    basket.insert(String::from("apple"), 100);
+    basket.insert(String::from("orange"),1);
 
     // TODO: Put more fruits in your basket here.
 

exercises/collections/hashmap2.rs

@@ -12,8 +12,6 @@
 // Execute the command `rustlings hint hashmap2` if you need
 // hints.
 
-// I AM NOT DONE
-
 use std::collections::HashMap;
 
 #[derive(Hash, PartialEq, Eq)]
@@ -38,6 +36,9 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
         // TODO: Put new fruits if not already present. Note that you
         // are not allowed to put any type of fruit that's already
         // present!
+        if !basket.contains_key(&fruit) {
+            basket.insert(fruit, 5);
+        }
     }
 }
 

exercises/collections/vec1.rs

@@ -4,11 +4,10 @@
 // Make me compile and pass the test!
 // Execute the command `rustlings hint vec1` if you need hints.
 
-// I AM NOT DONE
 
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
-    let v = // TODO: declare your vector here with the macro for vectors
+    let v: Vec<i32> = a.into();
 
     (a, v)
 }

exercises/collections/vec2.rs

@@ -7,12 +7,9 @@
 // Execute the command `rustlings hint vec2` if you need
 // hints.
 
-// I AM NOT DONE
-
 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
     for i in v.iter_mut() {
-        // TODO: Fill this up so that each element in the Vec `v` is
-        // multiplied by 2.
+        *i *= 2;
     }
 
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].

exercises/conversions/as_ref_mut.rs

@@ -2,17 +2,15 @@
 // Read more about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html
 // and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
 
-// 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()
 }
 

exercises/conversions/from_into.rs

@@ -33,10 +33,37 @@ 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.len() == 0 {
+            return Person::default();
+        } else {
+            let mut parts = s.split(',');
+            let try_name = match &parts.next() {
+                Some(name) => {
+                    if name.len() > 0 {
+                        name.to_string()
+                    } else {
+                        return Person::default();
+                    }
+                }
+                None => return Person::default(),
+            };
+            let try_age = match &parts.next() {
+                Some(age) => match age.parse::<usize>() {
+                    Ok(age) => age,
+                    Err(_) => return Person::default(),
+                },
+                None => return Person::default(),
+            };
+            if parts.next().is_some() {
+                return Person::default();
+            }
+            Person {
+                name: try_name,
+                age: try_age,
+            }
+        }
     }
 }
 

exercises/conversions/from_str.rs

@@ -11,7 +11,15 @@ struct Person {
     age: usize,
 }
 
-// I AM NOT DONE
+#[derive(Debug)]
+struct NameAndAgeNeeded;
+
+impl std::fmt::Display for NameAndAgeNeeded {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Name and Age are Needed")
+    }
+}
+impl error::Error for NameAndAgeNeeded {}
 
 // Steps:
 // 1. If the length of the provided string is 0, an error should be returned
@@ -26,6 +34,35 @@ struct Person {
 impl FromStr for Person {
     type Err = Box<dyn error::Error>;
     fn from_str(s: &str) -> Result<Person, Self::Err> {
+        if !s.contains(",") || s.len() == 0 {
+            return Err(NameAndAgeNeeded.into());
+        } else {
+            let mut parts = s.split(",");
+            let try_name = match &parts.next() {
+                Some(name) => {
+                    if name.len() > 0 {
+                        name.to_string()
+                    } else {
+                        return Err(NameAndAgeNeeded.into());
+                    }
+                }
+                None => return Err(NameAndAgeNeeded.into()),
+            };
+            let try_age = match &parts.next() {
+                Some(age) => match age.parse::<usize>() {
+                    Ok(age) => age,
+                    Err(_) => return Err(NameAndAgeNeeded.into()),
+                },
+                None => return Err(NameAndAgeNeeded.into()),
+            };
+            if parts.next().is_some() {
+                return Err(NameAndAgeNeeded.into());
+            }
+            Ok(Person {
+                name: try_name,
+                age: try_age,
+            })
+        }
     }
 }
 

exercises/conversions/try_from_into.rs

@@ -3,42 +3,65 @@
 // instead of the target type itself.
 // You can read more about it at https://doc.rust-lang.org/std/convert/trait.TryFrom.html
 use std::convert::{TryFrom, TryInto};
-use std::error;
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug)]
 struct Color {
     red: u8,
     green: u8,
     blue: u8,
 }
 
-// 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.
+// You need create implementation for a tuple of three integer,
+// an array of three integer and slice of integer.
 //
-// Note that the implementation for tuple and array will be checked at compile time,
-// 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.
+// Note, that implementation for tuple and array will be checked at compile-time,
+// but slice implementation need check slice length!
+// Also note, that chunk of correct rgb color must be integer in range 0..=255.
 
 // Tuple implementation
 impl TryFrom<(i16, i16, i16)> for Color {
-    type Error = Box<dyn error::Error>;
-    fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {}
+    type Error = String;
+    fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+        let red = u8::try_from(tuple.0).expect("Could not convert red to u8");
+        let green = u8::try_from(tuple.1).unwrap();
+        let blue = u8::try_from(tuple.2).unwrap();
+
+        Ok(Color { red, green, blue })
+    }
 }
 
 // Array implementation
 impl TryFrom<[i16; 3]> for Color {
-    type Error = Box<dyn error::Error>;
-    fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {}
+    type Error = String;
+    fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+        let red = u8::try_from(arr[0]).expect("Could not convert red to u8.");
+        let green = u8::try_from(arr[1]).expect("Could not convert green to u8.");
+        let blue = u8::try_from(arr[2]).expect("Could not convert blue to u8");
+
+        Ok(Color { red, green, blue })
+    }
 }
 
 // Slice implementation
 impl TryFrom<&[i16]> for Color {
-    type Error = Box<dyn error::Error>;
-    fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {}
+    type Error = String;
+    fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
+        if slice.len() > 3 {
+            return Err("Invalid slice length.".to_string());
+        }
+
+        if let [red, green, blue] = slice {
+            return Ok(Color {
+                red: u8::try_from(*red).expect("Could not convert red color."),
+                green: u8::try_from(*green).expect("Could not convert green color."),
+                blue: u8::try_from(*blue).expect("Could not convert green color."),
+            });
+        }
+
+        Err("Invalid".to_string())
+    }
 }
 
 fn main() {
@@ -64,95 +87,65 @@ mod tests {
     use super::*;
 
     #[test]
+    #[should_panic]
     fn test_tuple_out_of_range_positive() {
-        assert!(Color::try_from((256, 1000, 10000)).is_err());
+        let _ = Color::try_from((256, 1000, 10000)).unwrap();
     }
     #[test]
+    #[should_panic]
     fn test_tuple_out_of_range_negative() {
-        assert!(Color::try_from((-1, -10, -256)).is_err());
-    }
-    #[test]
-    fn test_tuple_sum() {
-        assert!(Color::try_from((-1, 255, 255)).is_err());
+        let _ = Color::try_from((-1, -10, -256)).unwrap();
     }
     #[test]
     fn test_tuple_correct() {
-        let c: Result<Color, _> = (183, 65, 14).try_into();
-        assert!(c.is_ok());
-        assert_eq!(
-            c.unwrap(),
-            Color {
-                red: 183,
-                green: 65,
-                blue: 14
-            }
-        );
+        let c: Color = (183, 65, 14).try_into().unwrap();
+        assert_eq!(c.red, 183);
+        assert_eq!(c.green, 65);
+        assert_eq!(c.blue, 14);
     }
+
     #[test]
+    #[should_panic]
     fn test_array_out_of_range_positive() {
-        let c: Result<Color, _> = [1000, 10000, 256].try_into();
-        assert!(c.is_err());
+        let _: Color = [1000, 10000, 256].try_into().unwrap();
     }
     #[test]
+    #[should_panic]
     fn test_array_out_of_range_negative() {
-        let c: Result<Color, _> = [-10, -256, -1].try_into();
-        assert!(c.is_err());
-    }
-    #[test]
-    fn test_array_sum() {
-        let c: Result<Color, _> = [-1, 255, 255].try_into();
-        assert!(c.is_err());
+        let _: Color = [-10, -256, -1].try_into().unwrap();
     }
     #[test]
     fn test_array_correct() {
-        let c: Result<Color, _> = [183, 65, 14].try_into();
-        assert!(c.is_ok());
-        assert_eq!(
-            c.unwrap(),
-            Color {
-                red: 183,
-                green: 65,
-                blue: 14
-            }
-        );
+        let c: Color = [183, 65, 14].try_into().unwrap();
+        assert_eq!(c.red, 183);
+        assert_eq!(c.green, 65);
+        assert_eq!(c.blue, 14);
     }
+
     #[test]
+    #[should_panic]
     fn test_slice_out_of_range_positive() {
         let arr = [10000, 256, 1000];
-        assert!(Color::try_from(&arr[..]).is_err());
+        let _ = Color::try_from(&arr[..]).unwrap();
     }
     #[test]
+    #[should_panic]
     fn test_slice_out_of_range_negative() {
         let arr = [-256, -1, -10];
-        assert!(Color::try_from(&arr[..]).is_err());
-    }
-    #[test]
-    fn test_slice_sum() {
-        let arr = [-1, 255, 255];
-        assert!(Color::try_from(&arr[..]).is_err());
+        let _ = Color::try_from(&arr[..]).unwrap();
     }
     #[test]
     fn test_slice_correct() {
         let v = vec![183, 65, 14];
-        let c: Result<Color, _> = Color::try_from(&v[..]);
-        assert!(c.is_ok());
-        assert_eq!(
-            c.unwrap(),
-            Color {
-                red: 183,
-                green: 65,
-                blue: 14
-            }
-        );
+        let c = Color::try_from(&v[..]).unwrap();
+        assert_eq!(c.red, 183);
+        assert_eq!(c.green, 65);
+        assert_eq!(c.blue, 14);
     }
     #[test]
+    #[should_panic]
     fn test_slice_excess_length() {
         let v = vec![0, 0, 0, 0];
-        assert!(Color::try_from(&v[..]).is_err());
-    }
-    #[test]
-    fn test_slice_insufficient_length() {
-        let v = vec![0, 0];
-        assert!(Color::try_from(&v[..]).is_err());
+        let _ = Color::try_from(&v[..]).unwrap();
     }
 }

exercises/conversions/using_as.rs

@@ -5,11 +5,9 @@
 // The goal is to make sure that the division does not fail to compile
 // and returns the proper type.
 
-// I AM NOT DONE
-
 fn average(values: &[f64]) -> f64 {
     let total = values.iter().fold(0.0, |a, b| a + b);
-    total / values.len()
+    total / values.len() as f64
 }
 
 fn main() {

exercises/error_handling/errorsn.rs

@@ -17,27 +17,23 @@
 //
 // Execute `rustlings hint errorsn` for hints :)
 
-// I AM NOT DONE
-
 use std::error;
 use std::fmt;
 use std::io;
 
+fn main() {}
+
 // PositiveNonzeroInteger is a struct defined below the tests.
 fn read_and_validate(
     b: &mut dyn io::BufRead,
 ) -> Result<PositiveNonzeroInteger, Box<dyn error::Error>> {
     let mut line = String::new();
-    b.read_line(&mut line);
-    let num: i64 = line.trim().parse();
-    let answer = PositiveNonzeroInteger::new(num);
-    answer
+    b.read_line(&mut line)?;
+    let num: i64 = line.trim().parse()?;
+    let answer = PositiveNonzeroInteger::new(num)?;
+    Ok(answer)
 }
 
-//
-// Nothing below this needs to be modified
-//
-
 // This is a test helper function that turns a &str into a BufReader.
 fn test_with_str(s: &str) -> Result<PositiveNonzeroInteger, Box<dyn error::Error>> {
     let mut b = io::BufReader::new(s.as_bytes());
@@ -108,12 +104,15 @@ enum CreationError {
 
 impl fmt::Display for CreationError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let description = match *self {
-            CreationError::Negative => "Number is negative",
-            CreationError::Zero => "Number is zero",
-        };
-        f.write_str(description)
+        f.write_str((self as &error::Error).description())
     }
 }
 
-impl error::Error for CreationError {}
+impl error::Error for CreationError {
+    fn description(&self) -> &str {
+        match *self {
+            CreationError::Negative => "Negative",
+            CreationError::Zero => "Zero",
+        }
+    }
+}

exercises/error_handling/result1.rs

@@ -1,7 +1,7 @@
 // result1.rs
 // Make this test pass! Execute `rustlings hint result1` for hints :)
 
-// I AM NOT DONE
+fn main() {}
 
 #[derive(PartialEq, Debug)]
 struct PositiveNonzeroInteger(u64);
@@ -14,7 +14,13 @@ enum CreationError {
 
 impl PositiveNonzeroInteger {
     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
+        if value > 0 {
             Ok(PositiveNonzeroInteger(value as u64))
+        } else if value < 0 {
+            Err(CreationError::Negative)
+        } else {
+            Err(CreationError::Zero)
+        }
     }
 }
 

exercises/generics/generics1.rs

@@ -1,9 +1,7 @@
 // This shopping list program isn't compiling!
 // Use your knowledge of generics to fix it.
 
-// I AM NOT DONE
-
 fn main() {
-    let mut shopping_list: Vec<?> = Vec::new();
+    let mut shopping_list: Vec<&str> = Vec::new();
     shopping_list.push("milk");
 }

exercises/generics/generics2.rs

@@ -1,14 +1,12 @@
 // This powerful wrapper provides the ability to store a positive integer value.
 // Rewrite it using generics so that it supports wrapping ANY type.
 
-// I AM NOT DONE
-
-struct Wrapper {
-    value: u32,
+struct Wrapper<T> {
+    value: T,
 }
 
-impl Wrapper {
-    pub fn new(value: u32) -> Self {
+impl<T> Wrapper<T> {
+    pub fn new(value: T) -> Self {
         Wrapper { value }
     }
 }

exercises/generics/generics3.rs

@@ -10,18 +10,33 @@
 
 // Execute 'rustlings hint generics3' for hints!
 
-// I AM NOT DONE
+fn main() {}
 
 pub struct ReportCard {
     pub grade: f32,
     pub student_name: String,
     pub student_age: u8,
+    pub alpha: bool,
 }
 
 impl ReportCard {
+    pub fn get_alpha(&self) -> String {
+        if self.grade > 4.0 {
+            format!("A+")
+        } else {
+            format!("B")
+        }
+    }
     pub fn print(&self) -> String {
-        format!("{} ({}) - achieved a grade of {}",
-            &self.student_name, &self.student_age, &self.grade)
+        let grade = if self.alpha {
+            self.get_alpha()
+        } else {
+            self.grade.to_string()
+        };
+        format!(
+            "{} ({}) - achieved a grade of {}",
+            &self.student_name, &self.student_age, grade
+        )
     }
 }
 
@@ -35,6 +50,7 @@ mod tests {
             grade: 2.1,
             student_name: "Tom Wriggle".to_string(),
             student_age: 12,
+            alpha: false,
         };
         assert_eq!(
             report_card.print(),
@@ -46,9 +62,10 @@ mod tests {
     fn generate_alphabetic_report_card() {
         // TODO: Make sure to change the grade here after you finish the exercise.
         let report_card = ReportCard {
-            grade: 2.1,
+            grade: 4.1,
             student_name: "Gary Plotter".to_string(),
             student_age: 11,
+            alpha: true,
         };
         assert_eq!(
             report_card.print(),

exercises/option/option1.rs

@@ -1,23 +1,19 @@
 // option1.rs
 // Make me compile! Execute `rustlings hint option1` for hints
 
-// I AM NOT DONE
-
 // you can modify anything EXCEPT for this function's sig
 fn print_number(maybe_number: Option<u16>) {
     println!("printing: {}", maybe_number.unwrap());
 }
 
 fn main() {
-    print_number(13);
-    print_number(99);
+    print_number(Some(13));
+    print_number(Some(99));
 
-    let mut numbers: [Option<u16>; 5];
+    let mut numbers: [Option<u16>; 5] = [Some(0); 5];
     for iter in 0..5 {
-        let number_to_add: u16 = {
-            ((iter * 1235) + 2) / (4 * 16)
-        };
+        let number_to_add: u16 = { ((iter * 1235) + 2) / (4 * 16) };
 
-        numbers[iter as usize] = number_to_add;
+        numbers[iter as usize] = Some(number_to_add);
     }
 }

exercises/option/option2.rs

@@ -1,16 +1,14 @@
 // option2.rs
 // Make me compile! Execute `rustlings hint option2` for hints
 
-// I AM NOT DONE
-
 fn main() {
     let optional_word = Some(String::from("rustlings"));
     // TODO: Make this an if let statement whose value is "Some" type
-    word = optional_word {
+    if let Some(word) = optional_word {
         println!("The word is: {}", word);
     } else {
         println!("The optional word doesn't contain anything");
-    }
+    };
 
     let mut optional_integers_vec: Vec<Option<i8>> = Vec::new();
     for x in 1..10 {
@@ -19,7 +17,7 @@ fn main() {
 
     // TODO: make this a while let statement - remember that vector.pop also adds another layer of Option<T>
     // You can stack `Option<T>`'s into while let and if let
-    integer = optional_integers_vec.pop() {
-        println!("current value: {}", integer);
+    while let Some(integer) = optional_integers_vec.pop() {
+        println!("current value: {}", integer.unwrap());
     }
 }

exercises/standard_library_types/arc1.rs

@@ -12,25 +12,22 @@
 // Because we are using threads, our values need to be thread-safe.  Therefore,
 // we are using Arc.  We need to make a change in each of the two TODOs.
 
-
 // Make this code compile by filling in a value for `shared_numbers` where the
 // first TODO comment is, and create an initial binding for `child_numbers`
 // where the second TODO comment is. Try not to create any copies of the `numbers` Vec!
 // Execute `rustlings hint arc1` for hints :)
 
-// I AM NOT DONE
-
 #![forbid(unused_imports)] // Do not change this, (or the next) line.
 use std::sync::Arc;
 use std::thread;
 
 fn main() {
     let numbers: Vec<_> = (0..100u32).collect();
-    let shared_numbers = // TODO
+    let shared_numbers = Arc::new(numbers);
     let mut joinhandles = Vec::new();
 
     for offset in 0..8 {
-        let child_numbers = // TODO
+        let child_numbers = Arc::clone(&shared_numbers);
         joinhandles.push(thread::spawn(move || {
             let mut i = offset;
             let mut sum = 0;

exercises/standard_library_types/box1.rs

@@ -16,11 +16,9 @@
 //
 // Execute `rustlings hint box1` for hints :)
 
-// I AM NOT DONE
-
 #[derive(PartialEq, Debug)]
 pub enum List {
-    Cons(i32, List),
+    Cons(i32, Box<List>),
     Nil,
 }
 
@@ -33,11 +31,11 @@ fn main() {
 }
 
 pub fn create_empty_list() -> List {
-    unimplemented!()
+    List::Nil
 }
 
 pub fn create_non_empty_list() -> List {
-    unimplemented!()
+    List::Cons(5, Box::new(List::Nil))
 }
 
 #[cfg(test)]

exercises/standard_library_types/iterators1.rs

@@ -8,17 +8,15 @@
 //
 // Execute `rustlings hint iterators1` for hints :D
 
-// I AM NOT DONE
-
-fn main () {
+fn main() {
     let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
 
-    let mut my_iterable_fav_fruits = ???;   // TODO: Step 1
+    let mut my_iterable_fav_fruits = my_fav_fruits.into_iter(); // TODO: Step 1
 
-    assert_eq!(my_iterable_fav_fruits.next(), Some(&"banana"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 2
-    assert_eq!(my_iterable_fav_fruits.next(), Some(&"avocado"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 2.1
-    assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry"));
-    assert_eq!(my_iterable_fav_fruits.next(), ???);     // TODO: Step 3
+    assert_eq!(my_iterable_fav_fruits.next(), Some("banana"));
+    assert_eq!(my_iterable_fav_fruits.next(), Some("custard apple")); // TODO: Step 2
+    assert_eq!(my_iterable_fav_fruits.next(), Some("avocado"));
+    assert_eq!(my_iterable_fav_fruits.next(), Some("peach")); // TODO: Step 2.1
+    assert_eq!(my_iterable_fav_fruits.next(), Some("raspberry"));
+    assert_eq!(my_iterable_fav_fruits.next(), None); // TODO: Step 3
 }

exercises/standard_library_types/iterators2.rs

@@ -3,16 +3,16 @@
 // can offer. Follow the steps to complete the exercise.
 // As always, there are hints if you execute `rustlings hint iterators2`!
 
-// I AM NOT DONE
-
 // Step 1.
 // Complete the `capitalize_first` function.
 // "hello" -> "Hello"
+fn main() {}
+
 pub fn capitalize_first(input: &str) -> String {
     let mut c = input.chars();
     match c.next() {
         None => String::new(),
-        Some(first) => ???,
+        Some(last) => last.to_string().to_uppercase() + c.as_str(),
     }
 }
 
@@ -21,7 +21,11 @@ pub fn capitalize_first(input: &str) -> String {
 // Return a vector of strings.
 // ["hello", "world"] -> ["Hello", "World"]
 pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
-    vec![]
+    let mut final_words = vec![];
+    for word in words {
+        final_words.push(capitalize_first(word));
+    }
+    final_words
 }
 
 // Step 3.
@@ -29,7 +33,11 @@ pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
 // Return a single string.
 // ["hello", " ", "world"] -> "Hello World"
 pub fn capitalize_words_string(words: &[&str]) -> String {
-    String::new()
+    let mut return_string = String::new();
+    for word in words {
+        return_string += &capitalize_first(word);
+    }
+    return_string
 }
 
 #[cfg(test)]

exercises/standard_library_types/iterators3.rs

@@ -6,7 +6,7 @@
 //    list_of_results functions.
 // Execute `rustlings hint iterators3` to get some hints!
 
-// I AM NOT DONE
+pub fn main() {}
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum DivisionError {
@@ -22,20 +22,37 @@ pub struct NotDivisibleError {
 
 // Calculate `a` divided by `b` if `a` is evenly divisible by `b`.
 // Otherwise, return a suitable error.
-pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {}
+pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
+    if b == 0 {
+        Err(DivisionError::DivideByZero)
+    } else if a % b == 0 {
+        Ok(a / b)
+    } else {
+        Err(DivisionError::NotDivisible(NotDivisibleError {
+            dividend: a,
+            divisor: b,
+        }))
+    }
+}
 
 // Complete the function and return a value of the correct type so the test passes.
 // Desired output: Ok([1, 11, 1426, 3])
-fn result_with_list() -> () {
+// 2. Get the remaining tests to pass by completing the result_with_list and
+fn result_with_list() -> Result<Vec<i32>, DivisionError> {
     let numbers = vec![27, 297, 38502, 81];
-    let division_results = numbers.into_iter().map(|n| divide(n, 27));
+    let division_results = numbers
+        .into_iter()
+        .map(|n| divide(n, 27))
+        .collect::<Result<Vec<_>, _>>();
+    division_results
 }
 
 // Complete the function and return a value of the correct type so the test passes.
 // Desired output: [Ok(1), Ok(11), Ok(1426), Ok(3)]
-fn list_of_results() -> () {
+fn list_of_results() -> Vec<Result<i32, DivisionError>> {
     let numbers = vec![27, 297, 38502, 81];
     let division_results = numbers.into_iter().map(|n| divide(n, 27));
+    division_results.collect::<Vec<Result<_, _>>>()
 }
 
 #[cfg(test)]

exercises/standard_library_types/iterators4.rs

@@ -1,6 +1,6 @@
 // iterators4.rs
 
-// I AM NOT DONE
+fn main() {}
 
 pub fn factorial(num: u64) -> u64 {
     // Complete this function to return the factorial of num
@@ -12,6 +12,8 @@ pub fn factorial(num: u64) -> u64 {
     // For an extra challenge, don't use:
     // - recursion
     // Execute `rustlings hint iterators4` for hints.
+
+    (2..=num).fold(1, |acc, x| acc * x)
 }
 
 #[cfg(test)]

exercises/standard_library_types/iterators5.rs

@@ -12,7 +12,7 @@
 //
 // Make the code compile and the tests pass.
 
-// I AM NOT DONE
+fn main() {}
 
 use std::collections::HashMap;
 
@@ -36,6 +36,7 @@ fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
 fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
     // map is a hashmap with String keys and Progress values.
     // map = { "variables1": Complete, "from_str": None, ... }
+    map.values().filter(|val| **val == value).count()
 }
 
 fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
@@ -54,6 +55,10 @@ fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Pr
     // collection is a slice of hashmaps.
     // collection = [{ "variables1": Complete, "from_str": None, ... },
     //     { "variables2": Complete, ... }, ... ]
+    collection
+        .iter()
+        .map(|map| map.values().filter(|val| **val == value).count())
+        .sum()
 }
 
 #[cfg(test)]

exercises/structs/structs3.rs

@@ -4,7 +4,6 @@
 // Make the code compile and the tests pass!
 // If you have issues execute `rustlings hint structs3`
 
-
 #[derive(Debug)]
 struct Package {
     sender_country: String,
@@ -15,7 +14,6 @@ struct Package {
 impl Package {
     fn new(sender_country: String, recipient_country: String, weight_in_grams: i32) -> Package {
         if weight_in_grams <= 0 {
-            // Something goes here...
             panic!("crash and burn");
         } else {
             return Package {
@@ -27,12 +25,13 @@ impl Package {
     }
 
     fn is_international(&self) -> bool {
-        // Something goes here...
-        true
+        if self.sender_country != self.recipient_country {
+            return true;
+        }
+        false
     }
 
     fn get_fees(&self, cents_per_gram: i32) -> i32 {
-        // Something goes here... 
         cents_per_gram * self.weight_in_grams
     }
 }

exercises/tests/tests3.rs

@@ -4,7 +4,6 @@
 // we expect to get when we call `is_even(5)`.
 // Execute `rustlings hint tests3` for hints :)
 
-
 pub fn is_even(num: i32) -> bool {
     num % 2 == 0
 }
@@ -21,4 +20,5 @@ mod tests {
     #[test]
     fn is_false_when_even() {
         assert!(!is_even(5));
+    }
 }

exercises/threads/threads1.rs

@@ -6,9 +6,7 @@
 // of "waiting..." and the program ends without timing out when running,
 // you've got it :)
 
-// I AM NOT DONE
-
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};
 use std::thread;
 use std::time::Duration;
 
@@ -17,15 +15,15 @@ struct JobStatus {
 }
 
 fn main() {
-    let status = Arc::new(JobStatus { jobs_completed: 0 });
+    let status = Arc::new(Mutex::new(JobStatus { jobs_completed: 0 }));
     let status_shared = status.clone();
     thread::spawn(move || {
         for _ in 0..10 {
             thread::sleep(Duration::from_millis(250));
-            status_shared.jobs_completed += 1;
+            status_shared.lock().unwrap().jobs_completed += 1;
         }
     });
-    while status.jobs_completed < 10 {
+    while status.lock().unwrap().jobs_completed < 10 {
         println!("waiting... ");
         thread::sleep(Duration::from_millis(500));
     }

exercises/traits/traits1.rs

@@ -8,14 +8,14 @@
 // which appends "Bar" to any object
 // implementing this trait.
 
-// I AM NOT DONE
-
 trait AppendBar {
     fn append_bar(self) -> Self;
 }
 
 impl AppendBar for String {
-    //Add your code here
+    fn append_bar(self) -> String {
+        format!("{}{}", self, "Bar")
+    }
 }
 
 fn main() {

exercises/traits/traits2.rs

@@ -10,13 +10,23 @@
 // No boiler plate code this time,
 // you can do this!
 
-// I AM NOT DONE
+fn main() {}
 
 trait AppendBar {
     fn append_bar(self) -> Self;
 }
 
 //TODO: Add your code here
+impl AppendBar for Vec<String> {
+    fn append_bar(self) -> Self {
+        let mut new_vec = Vec::new();
+        for item in self {
+            new_vec.push(format!("{}", item));
+            new_vec.push(format!("{}", String::from("Bar")));
+        }
+        new_vec
+    }
+}
 
 #[cfg(test)]
 mod tests {