diff --git a/exercises/clippy/clippy1.rs b/exercises/clippy/clippy1.rs
index bdb5dd2..a6dc18b 100644
--- a/exercises/clippy/clippy1.rs
+++ b/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 {
+ let x: f64 = 1.2331;
+ let y: f64 = 1.2332;
+ if (y - x).abs() > f64::EPSILON {
println!("Success!");
}
}
diff --git a/exercises/clippy/clippy2.rs b/exercises/clippy/clippy2.rs
index 37af9ed..4cdfbe7 100644
--- a/exercises/clippy/clippy2.rs
+++ b/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);
diff --git a/exercises/collections/hashmap1.rs b/exercises/collections/hashmap1.rs
index b1dc0bb..67d198b 100644
--- a/exercises/collections/hashmap1.rs
+++ b/exercises/collections/hashmap1.rs
@@ -11,17 +11,15 @@
// Execute the command `rustlings hint collections3` 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);
-
- // TODO: Put more fruits in your basket here.
+ basket.insert(String::from("apple"), 2);
+ basket.insert(String::from("mango"), 3);
basket
}
@@ -33,14 +31,13 @@ mod tests {
#[test]
fn at_least_three_types_of_fruits() {
let basket = fruit_basket();
+ println!("{:?}", basket);
assert!(basket.len() >= 3);
}
#[test]
fn at_least_five_fruits() {
let basket = fruit_basket();
- assert!(basket
- .values()
- .sum::<u32>() >= 5);
+ assert!(basket.values().sum::<u32>() >= 5);
}
}
diff --git a/exercises/collections/hashmap2.rs b/exercises/collections/hashmap2.rs
index 7e25be7..68e3d04 100644
--- a/exercises/collections/hashmap2.rs
+++ b/exercises/collections/hashmap2.rs
@@ -12,8 +12,6 @@
// Execute the command `rustlings hint collections4` 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, 3);
+ }
}
}
@@ -75,9 +76,7 @@ mod tests {
fn greater_than_eleven_fruits() {
let mut basket = get_fruit_basket();
fruit_basket(&mut basket);
- let count = basket
- .values()
- .sum::<u32>();
+ let count = basket.values().sum::<u32>();
assert!(count > 11);
}
}
diff --git a/exercises/collections/vec1.rs b/exercises/collections/vec1.rs
index ac3d9f1..12559e2 100644
--- a/exercises/collections/vec1.rs
+++ b/exercises/collections/vec1.rs
@@ -4,11 +4,9 @@
// Make me compile and pass the test!
// Execute the command `rustlings hint collections1` 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 = a.to_vec();
(a, v)
}
diff --git a/exercises/collections/vec2.rs b/exercises/collections/vec2.rs
index ec6cfc0..65efe5a 100644
--- a/exercises/collections/vec2.rs
+++ b/exercises/collections/vec2.rs
@@ -7,14 +7,14 @@
// Execute the command `rustlings hint collections2` 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;
}
-
+ // OR
+ //v.iter_mut().for_each(|x| *x *= 2);
// At this point, `v` should be equal to [4, 8, 12, 16, 20].
v
}
@@ -28,11 +28,6 @@ mod tests {
let v: Vec<i32> = (1..).filter(|x| x % 2 == 0).take(5).collect();
let ans = vec_loop(v.clone());
- assert_eq!(
- ans,
- v.iter()
- .map(|x| x * 2)
- .collect::<Vec<i32>>()
- );
+ assert_eq!(ans, v.iter().map(|x| x * 2).collect::<Vec<i32>>());
}
}
diff --git a/exercises/conversions/as_ref_mut.rs b/exercises/conversions/as_ref_mut.rs
index 84f4a60..f1e5072 100644
--- a/exercises/conversions/as_ref_mut.rs
+++ b/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()
}
diff --git a/exercises/conversions/from_into.rs b/exercises/conversions/from_into.rs
index f24cf61..a127078 100644
--- a/exercises/conversions/from_into.rs
+++ b/exercises/conversions/from_into.rs
@@ -33,13 +33,68 @@ 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();
+// }
+// let string_vector = s.split(',').collect::<Vec<&str>>();
+// println!("{:?}", string_vector);
+// if string_vector[0] == "" || string_vector.len() < 2 {
+// return Person::default();
+// } else {
+// match string_vector[1].parse::<usize>() {
+// Ok(result) => Person {
+// name: string_vector[0].to_string(),
+// age: result,
+// },
+// Err(_) => Person::default(),
+// }
+// }
+// }
+//}
impl From<&str> for Person {
fn from(s: &str) -> Person {
+ // splits just in 2 parts
+ let parts = s.splitn(2, ',').collect::<Vec<&str>>();
+ // match all parts
+ match &parts[..] {
+ [name, age] if !name.is_empty() => age
+ .parse()
+ .map(|age| Person {
+ name: name.to_string(),
+ age,
+ })
+ .unwrap_or_default(),
+ _ => Person::default(),
+ }
}
}
+//impl From<&str> for Person {
+// fn from(s: &str) -> Person {
+// if s.len() == 0 {
+// Person::default()
+// } else {
+// let mut person_itr = s.split(',');
+// match person_itr.next().map(|name| {
+// (
+// if name.is_empty() {
+// Err("Missing Name")
+// } else {
+// Ok(name.to_string())
+// },
+// person_itr.collect::<String>().parse::<usize>(),
+// )
+// }) {
+// Some((Ok(name), Ok(age))) => Person { name, age },
+// _ => Person::default(),
+// }
+// }
+// }
+//}
+
fn main() {
// Use the `from` function
let p1 = Person::from("Mark,20");
diff --git a/exercises/conversions/from_str.rs b/exercises/conversions/from_str.rs
index af9eee6..0af9b15 100644
--- a/exercises/conversions/from_str.rs
+++ b/exercises/conversions/from_str.rs
@@ -10,7 +10,6 @@ struct Person {
age: usize,
}
-// I AM NOT DONE
// Steps:
// 1. If the length of the provided string is 0, then return an error
// 2. Split the given string on the commas present in it
@@ -23,6 +22,19 @@ struct Person {
impl FromStr for Person {
type Err = String;
fn from_str(s: &str) -> Result<Person, Self::Err> {
+ let parts = s.splitn(2, ',').collect::<Vec<&str>>();
+ match &parts[..] {
+ [name, age] if !name.is_empty() => age
+ .parse()
+ .map(|age_as_uint| {
+ Ok(Person {
+ name: name.to_string(),
+ age: age_as_uint,
+ })
+ })
+ .unwrap(),
+ _ => Err("Shit happens".to_string()),
+ }
}
}
diff --git a/exercises/conversions/try_from_into.rs b/exercises/conversions/try_from_into.rs
index cd14daf..400c9af 100644
--- a/exercises/conversions/try_from_into.rs
+++ b/exercises/conversions/try_from_into.rs
@@ -11,8 +11,6 @@ struct Color {
blue: u8,
}
-// I AM NOT DONE
-
// Your task is to complete this implementation
// and return an Ok result of inner type Color.
// You need create implementation for a tuple of three integer,
@@ -25,19 +23,40 @@ struct Color {
// Tuple implementation
impl TryFrom<(i16, i16, i16)> for Color {
type Error = String;
- fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {}
+ fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
+ let (red, green, blue) = tuple;
+ match (u8::try_from(red), u8::try_from(green), u8::try_from(blue)) {
+ (Ok(red), Ok(green), Ok(blue)) => Ok(Color { red, green, blue }),
+ _ => Err(String::from("Failed to convert")),
+ }
+ }
}
// Array implementation
impl TryFrom<[i16; 3]> for Color {
type Error = String;
- fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {}
+ fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
+ let [red, green, blue] = arr;
+ match (u8::try_from(red), u8::try_from(green), u8::try_from(blue)) {
+ (Ok(red), Ok(green), Ok(blue)) => Ok(Color { red, green, blue }),
+ _ => Err(String::from("Failed to convert")),
+ }
+ }
}
// Slice implementation
impl TryFrom<&[i16]> for Color {
type Error = String;
- fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {}
+ fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
+ if slice.len() != 3 {
+ return Err("The slice has more than 3 items".to_string());
+ }
+ let [red, green, blue]: [i16; 3] = slice.try_into().unwrap();
+ match (u8::try_from(red), u8::try_from(green), u8::try_from(blue)) {
+ (Ok(red), Ok(green), Ok(blue)) => Ok(Color { red, green, blue }),
+ _ => Err(String::from("Failed to convert")),
+ }
+ }
}
fn main() {
@@ -88,17 +107,17 @@ mod tests {
}
#[test]
fn test_array_out_of_range_positive() {
- let c: Color = [1000, 10000, 256].try_into();
+ let c: Result<Color, String> = [1000, 10000, 256].try_into();
assert!(c.is_err());
}
#[test]
fn test_array_out_of_range_negative() {
- let c: Color = [-10, -256, -1].try_into();
+ let c: Result<Color, String> = [-10, -256, -1].try_into();
assert!(c.is_err());
}
#[test]
fn test_array_sum() {
- let c: Color = [-1, 255, 255].try_into();
+ let c: Result<Color, String> = [-1, 255, 255].try_into();
assert!(c.is_err());
}
#[test]
diff --git a/exercises/conversions/using_as.rs b/exercises/conversions/using_as.rs
index 821309e..f4a33ab 100644
--- a/exercises/conversions/using_as.rs
+++ b/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() {
diff --git a/exercises/enums/enums1.rs b/exercises/enums/enums1.rs
index a2223d3..5f93b3c 100644
--- a/exercises/enums/enums1.rs
+++ b/exercises/enums/enums1.rs
@@ -1,11 +1,12 @@
// enums1.rs
// Make me compile! Execute `rustlings hint enums1` for hints!
-// I AM NOT DONE
-
#[derive(Debug)]
enum Message {
- // TODO: define a few types of messages as used below
+ Quit,
+ Echo,
+ Move,
+ ChangeColor, // TODO: define a few types of messages as used below
}
fn main() {
diff --git a/exercises/enums/enums2.rs b/exercises/enums/enums2.rs
index ec32d95..9ef853c 100644
--- a/exercises/enums/enums2.rs
+++ b/exercises/enums/enums2.rs
@@ -1,11 +1,12 @@
// enums2.rs
// Make me compile! Execute `rustlings hint enums2` for hints!
-// I AM NOT DONE
-
#[derive(Debug)]
enum Message {
- // TODO: define the different variants used below
+ Move { x: i32, y: i32 },
+ Echo(String),
+ ChangeColor(u8, u8, u8),
+ Quit, // TODO: define the different variants used below
}
impl Message {
diff --git a/exercises/enums/enums3.rs b/exercises/enums/enums3.rs
index 178b40c..acd3169 100644
--- a/exercises/enums/enums3.rs
+++ b/exercises/enums/enums3.rs
@@ -1,10 +1,11 @@
// enums3.rs
// Address all the TODOs to make the tests pass!
-// I AM NOT DONE
-
enum Message {
- // TODO: implement the message variant types based on their usage below
+ ChangeColor((u8, u8, u8)),
+ Echo(String),
+ Move(Point),
+ Quit, // TODO: implement the message variant types based on their usage below
}
struct Point {
@@ -36,6 +37,12 @@ impl State {
}
fn process(&mut self, message: Message) {
+ match message {
+ Message::ChangeColor(color) => self.change_color(color),
+ Message::Echo(stringe) => self.echo(stringe),
+ Message::Move(point) => self.move_position(point),
+ Message::Quit => self.quit(),
+ };
// TODO: create a match expression to process the different message variants
}
}
diff --git a/exercises/error_handling/errors1.rs b/exercises/error_handling/errors1.rs
index 9c24d85..cf26184 100644
--- a/exercises/error_handling/errors1.rs
+++ b/exercises/error_handling/errors1.rs
@@ -6,14 +6,12 @@
// this function to have.
// Execute `rustlings hint errors1` for hints!
-// I AM NOT DONE
-
-pub fn generate_nametag_text(name: String) -> Option<String> {
+pub fn generate_nametag_text(name: String) -> Result<String, String> {
if name.len() > 0 {
- Some(format!("Hi! My name is {}", name))
+ Ok(format!("Hi! My name is {}", name))
} else {
// Empty names aren't allowed.
- None
+ Err("`name` was empty; it must be nonempty.".to_string())
}
}
@@ -28,7 +26,7 @@ mod tests {
fn generates_nametag_text_for_a_nonempty_name() {
assert_eq!(
generate_nametag_text("Beyoncé".into()),
- Some("Hi! My name is Beyoncé".into())
+ Ok("Hi! My name is Beyoncé".into())
);
}
diff --git a/exercises/error_handling/errors2.rs b/exercises/error_handling/errors2.rs
index aad3a93..d5c66ef 100644
--- a/exercises/error_handling/errors2.rs
+++ b/exercises/error_handling/errors2.rs
@@ -16,15 +16,16 @@
// There are at least two ways to implement this that are both correct-- but
// one is a lot shorter! Execute `rustlings hint errors2` for hints to both ways.
-// I AM NOT DONE
-
use std::num::ParseIntError;
pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
let processing_fee = 1;
let cost_per_item = 5;
- let qty = item_quantity.parse::<i32>();
-
+ let qty = item_quantity.parse::<i32>()?;
+ /* match item_quantity.parse::<i32>() {*/
+ //Ok(qty) => Ok(qty * cost_per_item + processing_fee),
+ //Err(e) => Err(e),
+ /*}*/
Ok(qty * cost_per_item + processing_fee)
}
diff --git a/exercises/error_handling/errors3.rs b/exercises/error_handling/errors3.rs
index 460ac5c..33ac0ff 100644
--- a/exercises/error_handling/errors3.rs
+++ b/exercises/error_handling/errors3.rs
@@ -4,24 +4,8 @@
// Why not? What should we do to fix it?
// Execute `rustlings hint errors3` for hints!
-// I AM NOT DONE
-
use std::num::ParseIntError;
-fn main() {
- let mut tokens = 100;
- let pretend_user_input = "8";
-
- let cost = total_cost(pretend_user_input)?;
-
- if cost > tokens {
- println!("You can't afford that many!");
- } else {
- tokens -= cost;
- println!("You now have {} tokens.", tokens);
- }
-}
-
pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
let processing_fee = 1;
let cost_per_item = 5;
@@ -29,3 +13,18 @@ pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
Ok(qty * cost_per_item + processing_fee)
}
+
+fn main() -> Result<(), ParseIntError> {
+ let mut tokens = 100;
+ let pretend_user_input = "8";
+ println!("{:?}", total_cost(pretend_user_input));
+ let cost = total_cost(pretend_user_input)?;
+
+ if cost > tokens {
+ println!("You can't afford that many!");
+ } else {
+ tokens -= cost;
+ println!("You now have {} tokens.", tokens);
+ }
+ Ok(())
+}
diff --git a/exercises/error_handling/errorsn.rs b/exercises/error_handling/errorsn.rs
index 5fe212b..3c24f3d 100644
--- a/exercises/error_handling/errorsn.rs
+++ b/exercises/error_handling/errorsn.rs
@@ -17,19 +17,19 @@
//
// Execute `rustlings hint errorsn` for hints :)
-// I AM NOT DONE
-
use std::error;
use std::fmt;
use std::io;
// PositiveNonzeroInteger is a struct defined below the tests.
-fn read_and_validate(b: &mut dyn io::BufRead) -> Result<PositiveNonzeroInteger, ???> {
+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)
}
//
diff --git a/exercises/error_handling/result1.rs b/exercises/error_handling/result1.rs
index b978001..a2d7fea 100644
--- a/exercises/error_handling/result1.rs
+++ b/exercises/error_handling/result1.rs
@@ -1,8 +1,6 @@
// result1.rs
// Make this test pass! Execute `rustlings hint result1` for hints :)
-// I AM NOT DONE
-
#[derive(PartialEq, Debug)]
struct PositiveNonzeroInteger(u64);
@@ -14,7 +12,17 @@ enum CreationError {
impl PositiveNonzeroInteger {
fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
- Ok(PositiveNonzeroInteger(value as u64))
+ match value {
+ value if value < 0 => Err(CreationError::Negative),
+ 0 => Err(CreationError::Zero),
+ _ => Ok(PositiveNonzeroInteger(value as u64)),
+ }
+ /*if value < 0 {*/
+ //return Err(CreationError::Negative);
+ //} else if value == 0 {
+ //return Err(CreationError::Zero);
+ //}
+ /*Ok(PositiveNonzeroInteger(value as u64))*/
}
}
diff --git a/exercises/functions/functions1.rs b/exercises/functions/functions1.rs
index 3112527..df36267 100644
--- a/exercises/functions/functions1.rs
+++ b/exercises/functions/functions1.rs
@@ -1,7 +1,7 @@
// functions1.rs
// Make me compile! Execute `rustlings hint functions1` for hints :)
-// I AM NOT DONE
+fn call_me() {}
fn main() {
call_me();
diff --git a/exercises/functions/functions2.rs b/exercises/functions/functions2.rs
index 108ba38..7d2cf57 100644
--- a/exercises/functions/functions2.rs
+++ b/exercises/functions/functions2.rs
@@ -1,14 +1,12 @@
// functions2.rs
// Make me compile! Execute `rustlings hint functions2` for hints :)
-// I AM NOT DONE
-
-fn main() {
- call_me(3);
-}
-
-fn call_me(num) {
+fn call_me(num: i8) {
for i in 0..num {
println!("Ring! Call number {}", i + 1);
}
}
+
+fn main() {
+ call_me(3);
+}
diff --git a/exercises/functions/functions3.rs b/exercises/functions/functions3.rs
index e3c1bf7..5aa9072 100644
--- a/exercises/functions/functions3.rs
+++ b/exercises/functions/functions3.rs
@@ -1,14 +1,12 @@
// functions3.rs
// Make me compile! Execute `rustlings hint functions3` for hints :)
-// I AM NOT DONE
-
fn main() {
- call_me();
+ call_me(None);
}
-fn call_me(num: i32) {
- for i in 0..num {
+fn call_me(num: Option<i32>) {
+ for i in 0..num.unwrap_or(0) {
println!("Ring! Call number {}", i + 1);
}
}
diff --git a/exercises/functions/functions4.rs b/exercises/functions/functions4.rs
index 58637e4..b6af7c4 100644
--- a/exercises/functions/functions4.rs
+++ b/exercises/functions/functions4.rs
@@ -4,14 +4,12 @@
// This store is having a sale where if the price is an even number, you get
// 10 Rustbucks off, but if it's an odd number, it's 3 Rustbucks off.
-// I AM NOT DONE
-
fn main() {
let original_price = 51;
println!("Your sale price is {}", sale_price(original_price));
}
-fn sale_price(price: i32) -> {
+fn sale_price(price: i32) -> i32 {
if is_even(price) {
price - 10
} else {
diff --git a/exercises/functions/functions5.rs b/exercises/functions/functions5.rs
index d22aa6c..059e929 100644
--- a/exercises/functions/functions5.rs
+++ b/exercises/functions/functions5.rs
@@ -1,13 +1,11 @@
// functions5.rs
// Make me compile! Execute `rustlings hint functions5` for hints :)
-// I AM NOT DONE
-
fn main() {
let answer = square(3);
println!("The answer is {}", answer);
}
fn square(num: i32) -> i32 {
- num * num;
+ num * num
}
diff --git a/exercises/generics/generics1.rs b/exercises/generics/generics1.rs
index 967287e..07a3ed8 100644
--- a/exercises/generics/generics1.rs
+++ b/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");
}
diff --git a/exercises/generics/generics2.rs b/exercises/generics/generics2.rs
index 0cb59ad..57ae948 100644
--- a/exercises/generics/generics2.rs
+++ b/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 }
}
}
diff --git a/exercises/generics/generics3.rs b/exercises/generics/generics3.rs
index 64dd9bc..8e81295 100644
--- a/exercises/generics/generics3.rs
+++ b/exercises/generics/generics3.rs
@@ -10,18 +10,18 @@
// Execute 'rustlings hint generics3' for hints!
-// I AM NOT DONE
-
-pub struct ReportCard {
- pub grade: f32,
+pub struct ReportCard<T> {
+ pub grade: T,
pub student_name: String,
pub student_age: u8,
}
-impl ReportCard {
+impl<T: std::fmt::Display> ReportCard<T> {
pub fn print(&self) -> String {
- format!("{} ({}) - achieved a grade of {}",
- &self.student_name, &self.student_age, &self.grade)
+ format!(
+ "{} ({}) - achieved a grade of {}",
+ &self.student_name, &self.student_age, &self.grade
+ )
}
}
@@ -46,7 +46,7 @@ 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: "A+",
student_name: "Gary Plotter".to_string(),
student_age: 11,
};
diff --git a/exercises/if/if1.rs b/exercises/if/if1.rs
index 9086754..1696377 100644
--- a/exercises/if/if1.rs
+++ b/exercises/if/if1.rs
@@ -1,13 +1,12 @@
// if1.rs
-// I AM NOT DONE
-
pub fn bigger(a: i32, b: i32) -> i32 {
// Complete this function to return the bigger number!
// Do not use:
// - another function call
// - additional variables
// Execute `rustlings hint if1` for hints
+ return if a >= b { a } else { b };
}
// Don't mind this for now :)
diff --git a/exercises/if/if2.rs b/exercises/if/if2.rs
index 80effbd..778520a 100644
--- a/exercises/if/if2.rs
+++ b/exercises/if/if2.rs
@@ -4,13 +4,11 @@
// Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
// Execute the command `rustlings hint if2` if you want a hint :)
-// I AM NOT DONE
-
pub fn fizz_if_foo(fizzish: &str) -> &str {
- if fizzish == "fizz" {
- "foo"
- } else {
- 1
+ match fizzish {
+ "fizz" => "foo",
+ "fuzz" => "bar",
+ _ => "baz",
}
}
diff --git a/exercises/macros/macros1.rs b/exercises/macros/macros1.rs
index ed0dac8..de2584a 100644
--- a/exercises/macros/macros1.rs
+++ b/exercises/macros/macros1.rs
@@ -1,8 +1,6 @@
// macros1.rs
// Make me compile! Execute `rustlings hint macros1` for hints :)
-// I AM NOT DONE
-
macro_rules! my_macro {
() => {
println!("Check out my macro!");
@@ -10,5 +8,5 @@ macro_rules! my_macro {
}
fn main() {
- my_macro();
+ my_macro!();
}
diff --git a/exercises/macros/macros2.rs b/exercises/macros/macros2.rs
index d0be123..a931064 100644
--- a/exercises/macros/macros2.rs
+++ b/exercises/macros/macros2.rs
@@ -1,14 +1,12 @@
// macros2.rs
// Make me compile! Execute `rustlings hint macros2` for hints :)
-// I AM NOT DONE
-
-fn main() {
- my_macro!();
-}
-
macro_rules! my_macro {
() => {
println!("Check out my macro!");
};
}
+
+fn main() {
+ my_macro!();
+}
diff --git a/exercises/macros/macros3.rs b/exercises/macros/macros3.rs
index 93a4311..40f1519 100644
--- a/exercises/macros/macros3.rs
+++ b/exercises/macros/macros3.rs
@@ -2,8 +2,7 @@
// Make me compile, without taking the macro out of the module!
// Execute `rustlings hint macros3` for hints :)
-// I AM NOT DONE
-
+#[macro_use]
mod macros {
macro_rules! my_macro {
() => {
@@ -11,7 +10,6 @@ mod macros {
};
}
}
-
fn main() {
my_macro!();
}
diff --git a/exercises/macros/macros4.rs b/exercises/macros/macros4.rs
index 3a74807..5608ecc 100644
--- a/exercises/macros/macros4.rs
+++ b/exercises/macros/macros4.rs
@@ -1,15 +1,13 @@
// macros4.rs
// Make me compile! Execute `rustlings hint macros4` for hints :)
-// I AM NOT DONE
-
macro_rules! my_macro {
() => {
println!("Check out my macro!");
- }
+ };
($val:expr) => {
println!("Look at this other macro: {}", $val);
- }
+ };
}
fn main() {
diff --git a/exercises/modules/modules1.rs b/exercises/modules/modules1.rs
index 812dfee..3af7f48 100644
--- a/exercises/modules/modules1.rs
+++ b/exercises/modules/modules1.rs
@@ -1,10 +1,8 @@
// modules1.rs
// Make me compile! Execute `rustlings hint modules1` for hints :)
-// I AM NOT DONE
-
mod sausage_factory {
- fn make_sausage() {
+ pub fn make_sausage() {
println!("sausage!");
}
}
diff --git a/exercises/modules/modules2.rs b/exercises/modules/modules2.rs
index fde439d..50a3f08 100644
--- a/exercises/modules/modules2.rs
+++ b/exercises/modules/modules2.rs
@@ -1,11 +1,9 @@
// modules2.rs
// Make me compile! Execute `rustlings hint modules2` for hints :)
-// I AM NOT DONE
-
mod delicious_snacks {
- use self::fruits::PEAR as fruit;
- use self::veggies::CUCUMBER as veggie;
+ pub use self::fruits::PEAR as fruit;
+ pub use self::veggies::CUCUMBER as veggie;
mod fruits {
pub const PEAR: &'static str = "Pear";
diff --git a/exercises/move_semantics/move_semantics1.rs b/exercises/move_semantics/move_semantics1.rs
index e2f5876..a95f851 100644
--- a/exercises/move_semantics/move_semantics1.rs
+++ b/exercises/move_semantics/move_semantics1.rs
@@ -1,12 +1,10 @@
// move_semantics1.rs
// Make me compile! Execute `rustlings hint move_semantics1` for hints :)
-// I AM NOT DONE
-
fn main() {
let vec0 = Vec::new();
- let vec1 = fill_vec(vec0);
+ let mut vec1 = fill_vec(vec0);
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
diff --git a/exercises/move_semantics/move_semantics2.rs b/exercises/move_semantics/move_semantics2.rs
index bd21fbb..ca18994 100644
--- a/exercises/move_semantics/move_semantics2.rs
+++ b/exercises/move_semantics/move_semantics2.rs
@@ -2,23 +2,21 @@
// Make me compile without changing line 13!
// Execute `rustlings hint move_semantics2` for hints :)
-// I AM NOT DONE
-
fn main() {
let vec0 = Vec::new();
- let mut vec1 = fill_vec(vec0);
+ let mut vec1 = fill_vec(&vec0);
// Do not change the following line!
- println!("{} has length {} content `{:?}`", "vec0", vec0.len(), vec0);
+ println!("{} has length {} content `{:?}`", "vec-2", vec0.len(), vec0);
vec1.push(88);
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
}
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
- let mut vec = vec;
+fn fill_vec(vec: &Vec<i32>) -> Vec<i32> {
+ let mut vec = vec.clone();
vec.push(22);
vec.push(44);
diff --git a/exercises/move_semantics/move_semantics3.rs b/exercises/move_semantics/move_semantics3.rs
index 43fef74..8be23e5 100644
--- a/exercises/move_semantics/move_semantics3.rs
+++ b/exercises/move_semantics/move_semantics3.rs
@@ -3,8 +3,6 @@
// (no lines with multiple semicolons necessary!)
// Execute `rustlings hint move_semantics3` for hints :)
-// I AM NOT DONE
-
fn main() {
let vec0 = Vec::new();
@@ -17,7 +15,7 @@ fn main() {
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
}
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
vec.push(22);
vec.push(44);
vec.push(66);
diff --git a/exercises/move_semantics/move_semantics4.rs b/exercises/move_semantics/move_semantics4.rs
index a1c4a41..e6e780b 100644
--- a/exercises/move_semantics/move_semantics4.rs
+++ b/exercises/move_semantics/move_semantics4.rs
@@ -4,12 +4,8 @@
// freshly created vector from fill_vec to its caller.
// Execute `rustlings hint move_semantics4` for hints!
-// I AM NOT DONE
-
fn main() {
- let vec0 = Vec::new();
-
- let mut vec1 = fill_vec(vec0);
+ let mut vec1 = fill_vec();
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
@@ -20,7 +16,7 @@ fn main() {
// `fill_vec()` no longer take `vec: Vec<i32>` as argument
fn fill_vec() -> Vec<i32> {
- let mut vec = vec;
+ let mut vec = Vec::new();
vec.push(22);
vec.push(44);
diff --git a/exercises/option/option1.rs b/exercises/option/option1.rs
index 602ff1a..85bf64e 100644
--- a/exercises/option/option1.rs
+++ b/exercises/option/option1.rs
@@ -1,23 +1,20 @@
// 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];
+ numbers = [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);
}
}
diff --git a/exercises/option/option2.rs b/exercises/option/option2.rs
index a1517d7..e182a21 100644
--- a/exercises/option/option2.rs
+++ b/exercises/option/option2.rs
@@ -1,12 +1,10 @@
// option2.rs
// Make me compile! Execute `rustlings hint option2` for hints
-// I AM NOT DONE
-
fn main() {
let optional_value = Some(String::from("rustlings"));
// TODO: Make this an if let statement whose value is "Some" type
- value = optional_value {
+ if let Some(value) = optional_value {
println!("the value of optional value is: {}", value);
} else {
println!("The optional value doesn't contain anything!");
@@ -19,7 +17,9 @@ 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
- value = optional_values_vec.pop() {
- println!("current value: {}", value);
+ while let Some(vector_value) = optional_values_vec.pop() {
+ if let Some(value) = vector_value {
+ println!("current value: {}", value);
+ }
}
}
diff --git a/exercises/primitive_types/primitive_types1.rs b/exercises/primitive_types/primitive_types1.rs
index 0912139..a45b1e4 100644
--- a/exercises/primitive_types/primitive_types1.rs
+++ b/exercises/primitive_types/primitive_types1.rs
@@ -2,8 +2,6 @@
// Fill in the rest of the line that has code missing!
// No hints, there's no tricks, just get used to typing these :)
-// I AM NOT DONE
-
fn main() {
// Booleans (`bool`)
@@ -12,8 +10,7 @@ fn main() {
println!("Good morning!");
}
- let // Finish the rest of this line like the example! Or make it be false!
- if is_evening {
+ if !is_morning {
println!("Good evening!");
}
}
diff --git a/exercises/primitive_types/primitive_types2.rs b/exercises/primitive_types/primitive_types2.rs
index 6576a4d..a275434 100644
--- a/exercises/primitive_types/primitive_types2.rs
+++ b/exercises/primitive_types/primitive_types2.rs
@@ -2,8 +2,6 @@
// Fill in the rest of the line that has code missing!
// No hints, there's no tricks, just get used to typing these :)
-// I AM NOT DONE
-
fn main() {
// Characters (`char`)
@@ -16,9 +14,9 @@ fn main() {
println!("Neither alphabetic nor numeric!");
}
- let // Finish this line like the example! What's your favorite character?
- // Try a letter, try a number, try a special character, try a character
- // from a different language than your own, try an emoji!
+ let your_character = 'A'; // Finish this line like the example! What's your favorite character?
+ // Try a letter, try a number, try a special character, try a character
+ // from a different language than your own, try an emoji!
if your_character.is_alphabetic() {
println!("Alphabetical!");
} else if your_character.is_numeric() {
diff --git a/exercises/primitive_types/primitive_types3.rs b/exercises/primitive_types/primitive_types3.rs
index aaa518b..c79f939 100644
--- a/exercises/primitive_types/primitive_types3.rs
+++ b/exercises/primitive_types/primitive_types3.rs
@@ -2,10 +2,10 @@
// Create an array with at least 100 elements in it where the ??? is.
// Execute `rustlings hint primitive_types3` for hints!
-// I AM NOT DONE
-
fn main() {
- let a = ???
+ let mut a = vec![0; 200];
+ a = (0..100).collect();
+ println!("{}", a.len());
if a.len() >= 100 {
println!("Wow, that's a big array!");
diff --git a/exercises/primitive_types/primitive_types4.rs b/exercises/primitive_types/primitive_types4.rs
index 10b553e..d773c13 100644
--- a/exercises/primitive_types/primitive_types4.rs
+++ b/exercises/primitive_types/primitive_types4.rs
@@ -2,13 +2,11 @@
// Get a slice out of Array a where the ??? is so that the test passes.
// Execute `rustlings hint primitive_types4` for hints!!
-// I AM NOT DONE
-
#[test]
fn slice_out_of_array() {
let a = [1, 2, 3, 4, 5];
- let nice_slice = ???
+ let nice_slice = &a[1..4];
assert_eq!([2, 3, 4], nice_slice)
}
diff --git a/exercises/primitive_types/primitive_types5.rs b/exercises/primitive_types/primitive_types5.rs
index 680d8d2..85f42cf 100644
--- a/exercises/primitive_types/primitive_types5.rs
+++ b/exercises/primitive_types/primitive_types5.rs
@@ -2,11 +2,9 @@
// Destructure the `cat` tuple so that the println will work.
// Execute `rustlings hint primitive_types5` for hints!
-// I AM NOT DONE
-
fn main() {
let cat = ("Furry McFurson", 3.5);
- let /* your pattern here */ = cat;
+ let (name, age) = cat;
println!("{} is {} years old.", name, age);
}
diff --git a/exercises/primitive_types/primitive_types6.rs b/exercises/primitive_types/primitive_types6.rs
index b8c9b82..833d6a0 100644
--- a/exercises/primitive_types/primitive_types6.rs
+++ b/exercises/primitive_types/primitive_types6.rs
@@ -3,14 +3,11 @@
// You can put the expression for the second element where ??? is so that the test passes.
// Execute `rustlings hint primitive_types6` for hints!
-// I AM NOT DONE
-
#[test]
fn indexing_tuple() {
let numbers = (1, 2, 3);
// Replace below ??? with the tuple indexing syntax.
- let second = ???;
+ let second = numbers.1;
- assert_eq!(2, second,
- "This is not the 2nd number in the tuple!")
+ assert_eq!(2, second, "This is not the 2nd number in the tuple!")
}
diff --git a/exercises/quiz1.rs b/exercises/quiz1.rs
index 5c5c355..cd6860c 100644
--- a/exercises/quiz1.rs
+++ b/exercises/quiz1.rs
@@ -7,11 +7,17 @@
// more than 40 at once, each apple only costs 1! Write a function that calculates
// the price of an order of apples given the order amount. No hints this time!
-// I AM NOT DONE
-
// Put your function here!
// fn ..... {
+fn calculate_apple_price(number_apples: i8) -> i8 {
+ if number_apples >= 40 {
+ number_apples
+ } else {
+ number_apples * 2
+ }
+}
+
// Don't modify this function!
#[test]
fn verify_test() {
diff --git a/exercises/quiz2.rs b/exercises/quiz2.rs
index de0dce9..37c33a5 100644
--- a/exercises/quiz2.rs
+++ b/exercises/quiz2.rs
@@ -7,8 +7,6 @@
// you think each value is. That is, add either `string_slice` or `string`
// before the parentheses on each line. If you're right, it will compile!
-// I AM NOT DONE
-
fn string_slice(arg: &str) {
println!("{}", arg);
}
@@ -17,14 +15,14 @@ fn string(arg: String) {
}
fn main() {
- ???("blue");
- ???("red".to_string());
- ???(String::from("hi"));
- ???("rust is fun!".to_owned());
- ???("nice weather".into());
- ???(format!("Interpolation {}", "Station"));
- ???(&String::from("abc")[0..1]);
- ???(" hello there ".trim());
- ???("Happy Monday!".to_string().replace("Mon", "Tues"));
- ???("mY sHiFt KeY iS sTiCkY".to_lowercase());
+ string_slice("blue");
+ string("red".to_string());
+ string(String::from("hi"));
+ string("rust is fun!".to_owned());
+ string("nice weather".into());
+ string(format!("Interpolation {}", "Station"));
+ string_slice(&String::from("abc")[0..1]);
+ string_slice(" hello there ".trim());
+ string("Happy Monday!".to_string().replace("Mon", "Tues"));
+ string("mY sHiFt KeY iS sTiCkY".to_lowercase());
}
diff --git a/exercises/quiz3.rs b/exercises/quiz3.rs
index a0cd371..ec86a8e 100644
--- a/exercises/quiz3.rs
+++ b/exercises/quiz3.rs
@@ -7,8 +7,6 @@
// we expect to get when we call `times_two` with a negative number.
// No hints, you can do this :)
-// I AM NOT DONE
-
pub fn times_two(num: i32) -> i32 {
num * 2
}
@@ -19,11 +17,12 @@ mod tests {
#[test]
fn returns_twice_of_positive_numbers() {
- assert_eq!(times_two(4), ???);
+ assert_eq!(times_two(4), 8);
}
#[test]
fn returns_twice_of_negative_numbers() {
// TODO write an assert for `times_two(-4)`
+ assert_eq!(times_two(-4), -8);
}
}
diff --git a/exercises/quiz4.rs b/exercises/quiz4.rs
index 6c47480..d7b0176 100644
--- a/exercises/quiz4.rs
+++ b/exercises/quiz4.rs
@@ -5,7 +5,11 @@
// Write a macro that passes the quiz! No hints this time, you can do it!
-// I AM NOT DONE
+macro_rules! my_macro {
+ ($val: expr) => {
+ format!("Hello {}", $val);
+ };
+}
#[cfg(test)]
mod tests {
diff --git a/exercises/standard_library_types/arc1.rs b/exercises/standard_library_types/arc1.rs
index 4ad649f..e9c2694 100644
--- a/exercises/standard_library_types/arc1.rs
+++ b/exercises/standard_library_types/arc1.rs
@@ -4,18 +4,18 @@
// somewhere. 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 = Arc::clone(&shared_numbers);
+ let child_numbers = shared_numbers.clone();
joinhandles.push(thread::spawn(move || {
let mut i = offset;
let mut sum = 0;
diff --git a/exercises/standard_library_types/box1.rs b/exercises/standard_library_types/box1.rs
index f312f3d..8bb5e60 100644
--- a/exercises/standard_library_types/box1.rs
+++ b/exercises/standard_library_types/box1.rs
@@ -16,14 +16,14 @@
//
// Execute `rustlings hint box1` for hints :)
-// I AM NOT DONE
-
#[derive(PartialEq, Debug)]
pub enum List {
- Cons(i32, List),
+ Cons(i32, Box<List>),
Nil,
}
+//use crate::List::{Cons, Nil};
+
fn main() {
println!("This is an empty cons list: {:?}", create_empty_list());
println!(
@@ -33,11 +33,11 @@ fn main() {
}
pub fn create_empty_list() -> List {
- unimplemented!()
+ List::Nil
}
pub fn create_non_empty_list() -> List {
- unimplemented!()
+ List::Cons(1, Box::new(List::Cons(1, Box::new(List::Nil))))
}
#[cfg(test)]
diff --git a/exercises/standard_library_types/iterators1.rs b/exercises/standard_library_types/iterators1.rs
index 3fd519d..58b66fd 100644
--- a/exercises/standard_library_types/iterators1.rs
+++ b/exercises/standard_library_types/iterators1.rs
@@ -1,24 +1,22 @@
// iterators1.rs
-//
+//
// Make me compile by filling in the `???`s
//
// When performing operations on elements within a collection, iterators are essential.
-// This module helps you get familiar with the structure of using an iterator and
+// This module helps you get familiar with the structure of using an iterator and
// how to go through elements within an iterable collection.
-//
+//
// 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.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(&"custard apple")); // 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(&"peach")); // 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(), None); // TODO: Step 3
}
diff --git a/exercises/standard_library_types/iterators2.rs b/exercises/standard_library_types/iterators2.rs
index 84d14ae..54f21b6 100644
--- a/exercises/standard_library_types/iterators2.rs
+++ b/exercises/standard_library_types/iterators2.rs
@@ -7,13 +7,11 @@
// Try to ensure it returns a single string.
// As always, there are hints if you execute `rustlings hint iterators2`!
-// I AM NOT DONE
-
pub fn capitalize_first(input: &str) -> String {
let mut c = input.chars();
match c.next() {
None => String::new(),
- Some(first) => first.collect::<String>() + c.as_str(),
+ Some(first) => first.to_uppercase().collect::<String>() + c.as_str(),
}
}
@@ -37,14 +35,20 @@ mod tests {
#[test]
fn test_iterate_string_vec() {
let words = vec!["hello", "world"];
- let capitalized_words: Vec<String> = // TODO
+ let capitalized_words: Vec<String> = words
+ .into_iter()
+ .map(|word| capitalize_first(word))
+ .collect();
assert_eq!(capitalized_words, ["Hello", "World"]);
}
#[test]
fn test_iterate_into_string() {
let words = vec!["hello", " ", "world"];
- let capitalized_words = // TODO
+ let capitalized_words = words
+ .into_iter()
+ .map(|word| capitalize_first(word))
+ .collect::<String>(); //when we specify the type at the end is called a turbofish
assert_eq!(capitalized_words, "Hello World");
}
}
diff --git a/exercises/standard_library_types/iterators3.rs b/exercises/standard_library_types/iterators3.rs
index 353cea6..0470240 100644
--- a/exercises/standard_library_types/iterators3.rs
+++ b/exercises/standard_library_types/iterators3.rs
@@ -7,8 +7,6 @@
// Execute `rustlings hint iterators3` to get some hints!
// Have fun :-)
-// I AM NOT DONE
-
#[derive(Debug, PartialEq, Eq)]
pub enum DivisionError {
NotDivisible(NotDivisibleError),
@@ -24,7 +22,19 @@ pub struct NotDivisibleError {
// This function should calculate `a` divided by `b` if `a` is
// evenly divisible by b.
// Otherwise, it should 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 {
+ return Err(DivisionError::DivideByZero);
+ }
+ if a % b == 0 {
+ return Ok(a / b);
+ } else {
+ Err(DivisionError::NotDivisible(NotDivisibleError {
+ dividend: a,
+ divisor: b,
+ }))
+ }
+}
#[cfg(test)]
mod tests {
@@ -58,12 +68,11 @@ mod tests {
}
// Iterator exercises using your `divide` function
- /*
#[test]
fn result_with_list() {
let numbers = vec![27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
- let x //... Fill in here!
+ let x = division_results.collect::<Result<Vec<i32>, DivisionError>>();
assert_eq!(format!("{:?}", x), "Ok([1, 11, 1426, 3])");
}
@@ -71,8 +80,7 @@ mod tests {
fn list_of_results() {
let numbers = vec![27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
- let x //... Fill in here!
+ let x = division_results.collect::<Vec<Result<i32, DivisionError>>>();
assert_eq!(format!("{:?}", x), "[Ok(1), Ok(11), Ok(1426), Ok(3)]");
}
- */
}
diff --git a/exercises/standard_library_types/iterators4.rs b/exercises/standard_library_types/iterators4.rs
index 8886283..a8baec4 100644
--- a/exercises/standard_library_types/iterators4.rs
+++ b/exercises/standard_library_types/iterators4.rs
@@ -1,7 +1,5 @@
// iterators4.rs
-// I AM NOT DONE
-
pub fn factorial(num: u64) -> u64 {
// Complete this function to return the factorial of num
// Do not use:
@@ -11,7 +9,11 @@ pub fn factorial(num: u64) -> u64 {
// - additional variables
// For an extra challenge, don't use:
// - recursion
- // Execute `rustlings hint iterators4` for hints.
+ // Execute `rustlings hint iterators4` for hints
+ // Check https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.fold
+ // 4! = 4x3x2x1 = 24
+ // 5! = 5x4x3x2x1 = 120
+ (1..=num).fold(1, |acc, x| acc * x)
}
#[cfg(test)]
diff --git a/exercises/strings/strings1.rs b/exercises/strings/strings1.rs
index 8090244..21a0139 100644
--- a/exercises/strings/strings1.rs
+++ b/exercises/strings/strings1.rs
@@ -2,13 +2,11 @@
// Make me compile without changing the function signature!
// Execute `rustlings hint strings1` for hints ;)
-// I AM NOT DONE
-
fn main() {
let answer = current_favorite_color();
println!("My current favorite color is {}", answer);
}
fn current_favorite_color() -> String {
- "blue"
+ "blue".to_string()
}
diff --git a/exercises/strings/strings2.rs b/exercises/strings/strings2.rs
index 5a2ce74..a048f88 100644
--- a/exercises/strings/strings2.rs
+++ b/exercises/strings/strings2.rs
@@ -2,11 +2,9 @@
// Make me compile without changing the function signature!
// Execute `rustlings hint strings2` for hints :)
-// I AM NOT DONE
-
fn main() {
let word = String::from("green"); // Try not changing this line :)
- if is_a_color_word(word) {
+ if is_a_color_word(&word) {
println!("That is a color word I know!");
} else {
println!("That is not a color word I know.");
diff --git a/exercises/structs/structs1.rs b/exercises/structs/structs1.rs
index 6d0b2f4..3f8eb34 100644
--- a/exercises/structs/structs1.rs
+++ b/exercises/structs/structs1.rs
@@ -1,13 +1,12 @@
// structs1.rs
// Address all the TODOs to make the tests pass!
-// I AM NOT DONE
-
struct ColorClassicStruct {
- // TODO: Something goes here
+ name: String,
+ hex: String,
}
-struct ColorTupleStruct(/* TODO: Something goes here */);
+struct ColorTupleStruct(String, String);
#[derive(Debug)]
struct UnitStruct;
@@ -19,7 +18,10 @@ mod tests {
#[test]
fn classic_c_structs() {
// TODO: Instantiate a classic c struct!
- // let green =
+ let green = ColorClassicStruct {
+ name: "green".to_string(),
+ hex: "#00FF00".to_string(),
+ };
assert_eq!(green.name, "green");
assert_eq!(green.hex, "#00FF00");
@@ -28,7 +30,7 @@ mod tests {
#[test]
fn tuple_structs() {
// TODO: Instantiate a tuple struct!
- // let green =
+ let green = ColorTupleStruct("green".to_string(), "#00FF00".to_string());
assert_eq!(green.0, "green");
assert_eq!(green.1, "#00FF00");
@@ -37,7 +39,7 @@ mod tests {
#[test]
fn unit_structs() {
// TODO: Instantiate a unit struct!
- // let unit_struct =
+ let unit_struct = UnitStruct;
let message = format!("{:?}s are fun!", unit_struct);
assert_eq!(message, "UnitStructs are fun!");
diff --git a/exercises/structs/structs2.rs b/exercises/structs/structs2.rs
index f9c6427..a326a31 100644
--- a/exercises/structs/structs2.rs
+++ b/exercises/structs/structs2.rs
@@ -1,8 +1,6 @@
// structs2.rs
// Address all the TODOs to make the tests pass!
-// I AM NOT DONE
-
#[derive(Debug)]
struct Order {
name: String,
@@ -34,7 +32,12 @@ mod tests {
fn your_order() {
let order_template = create_order_template();
// TODO: Create your own order using the update syntax and template above!
- // let your_order =
+
+ let your_order = Order {
+ name: "Hacker in Rust".to_string(),
+ count: 1,
+ ..order_template
+ };
assert_eq!(your_order.name, "Hacker in Rust");
assert_eq!(your_order.year, order_template.year);
assert_eq!(your_order.made_by_phone, order_template.made_by_phone);
diff --git a/exercises/structs/structs3.rs b/exercises/structs/structs3.rs
index 06fcaf2..147bdb9 100644
--- a/exercises/structs/structs3.rs
+++ b/exercises/structs/structs3.rs
@@ -3,8 +3,6 @@
// exercise we have defined the Package struct and we want to test some logic attached to it,
// make the code compile and the tests pass! If you have issues execute `rustlings hint structs3`
-// I AM NOT DONE
-
#[derive(Debug)]
struct Package {
sender_country: String,
@@ -15,7 +13,7 @@ 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!("The package is weightless!")
} else {
return Package {
sender_country,
@@ -25,12 +23,15 @@ impl Package {
}
}
- fn is_international(&self) -> ??? {
- // Something goes here...
+ fn is_international(&self) -> bool {
+ if self.sender_country != self.recipient_country {
+ return true;
+ }
+ false
}
- fn get_fees(&self, cents_per_gram: i32) -> ??? {
- // Something goes here...
+ fn get_fees(&self, cents_per_gram: i32) -> i32 {
+ self.weight_in_grams * cents_per_gram
}
}
@@ -62,7 +63,7 @@ mod tests {
let sender_country = String::from("Spain");
let recipient_country = String::from("Spain");
- let cents_per_gram = ???;
+ let cents_per_gram = 3;
let package = Package::new(sender_country, recipient_country, 1500);
diff --git a/exercises/tests/tests1.rs b/exercises/tests/tests1.rs
index 50586a1..005731f 100644
--- a/exercises/tests/tests1.rs
+++ b/exercises/tests/tests1.rs
@@ -6,12 +6,10 @@
// This test has a problem with it -- make the test compile! Make the test
// pass! Make the test fail! Execute `rustlings hint tests1` for hints :)
-// I AM NOT DONE
-
#[cfg(test)]
mod tests {
#[test]
fn you_can_assert() {
- assert!();
+ assert!(true);
}
}
diff --git a/exercises/tests/tests2.rs b/exercises/tests/tests2.rs
index 0d981ad..6bfcd09 100644
--- a/exercises/tests/tests2.rs
+++ b/exercises/tests/tests2.rs
@@ -2,12 +2,10 @@
// This test has a problem with it -- make the test compile! Make the test
// pass! Make the test fail! Execute `rustlings hint tests2` for hints :)
-// I AM NOT DONE
-
#[cfg(test)]
mod tests {
#[test]
fn you_can_assert_eq() {
- assert_eq!();
+ assert_eq!(1, 1);
}
}
diff --git a/exercises/tests/tests3.rs b/exercises/tests/tests3.rs
index 3424f94..6797e7b 100644
--- a/exercises/tests/tests3.rs
+++ b/exercises/tests/tests3.rs
@@ -4,8 +4,6 @@
// we expect to get when we call `is_even(5)`.
// Execute `rustlings hint tests3` for hints :)
-// I AM NOT DONE
-
pub fn is_even(num: i32) -> bool {
num % 2 == 0
}
@@ -16,11 +14,11 @@ mod tests {
#[test]
fn is_true_when_even() {
- assert!();
+ assert!(is_even(0));
}
#[test]
fn is_false_when_odd() {
- assert!();
+ assert!(!is_even(5));
}
}
diff --git a/exercises/threads/threads1.rs b/exercises/threads/threads1.rs
index 1785e8c..22ad487 100644
--- a/exercises/threads/threads1.rs
+++ b/exercises/threads/threads1.rs
@@ -5,26 +5,25 @@
// 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::RwLock;
use std::thread;
use std::time::Duration;
-
struct JobStatus {
jobs_completed: u32,
}
fn main() {
- let status = Arc::new(JobStatus { jobs_completed: 0 });
+ let status = Arc::new(RwLock::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;
+ let mut status_write = status_shared.write().unwrap();
+ status_write.jobs_completed += 1;
}
});
- while status.jobs_completed < 10 {
+ while status.read().unwrap().jobs_completed < 10 {
println!("waiting... ");
thread::sleep(Duration::from_millis(500));
}
diff --git a/exercises/traits/traits1.rs b/exercises/traits/traits1.rs
index 2ef9e11..2035052 100644
--- a/exercises/traits/traits1.rs
+++ b/exercises/traits/traits1.rs
@@ -8,19 +8,20 @@
// 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(mut self) -> Self {
+ self.push_str("Bar");
+ self
+ }
}
fn main() {
let s = String::from("Foo");
- let s = s.append_bar();
+ let mut s = s.append_bar();
println!("s: {}", s);
}
diff --git a/exercises/traits/traits2.rs b/exercises/traits/traits2.rs
index 916c3c4..67af43f 100644
--- a/exercises/traits/traits2.rs
+++ b/exercises/traits/traits2.rs
@@ -10,13 +10,16 @@
// No boiler plate code this time,
// you can do this!
-// I AM NOT DONE
-
trait AppendBar {
fn append_bar(self) -> Self;
}
-//TODO: Add your code here
+impl AppendBar for Vec<String> {
+ fn append_bar(mut self) -> Self {
+ self.push("Bar".to_string());
+ self
+ }
+}
#[cfg(test)]
mod tests {
diff --git a/exercises/variables/variables1.rs b/exercises/variables/variables1.rs
index 4a3af73..23af634 100644
--- a/exercises/variables/variables1.rs
+++ b/exercises/variables/variables1.rs
@@ -6,9 +6,7 @@
// even after you already figured it out. If you got everything working and
// feel ready for the next exercise, remove the `I AM NOT DONE` comment below.
-// I AM NOT DONE
-
fn main() {
- x = 5;
+ let x: i8 = 5;
println!("x has the value {}", x);
}
diff --git a/exercises/variables/variables2.rs b/exercises/variables/variables2.rs
index 7774a8f..9060d8b 100644
--- a/exercises/variables/variables2.rs
+++ b/exercises/variables/variables2.rs
@@ -1,10 +1,8 @@
// variables2.rs
// Make me compile! Execute the command `rustlings hint variables2` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
- let x;
+ let x: i8 = 0;
if x == 10 {
println!("Ten!");
} else {
diff --git a/exercises/variables/variables3.rs b/exercises/variables/variables3.rs
index 30ec48f..7d84709 100644
--- a/exercises/variables/variables3.rs
+++ b/exercises/variables/variables3.rs
@@ -1,10 +1,8 @@
// variables3.rs
// Make me compile! Execute the command `rustlings hint variables3` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
- let x = 3;
+ let mut x = 3;
println!("Number {}", x);
x = 5; // don't change this line
println!("Number {}", x);
diff --git a/exercises/variables/variables4.rs b/exercises/variables/variables4.rs
index 77f1e9a..f8c7845 100644
--- a/exercises/variables/variables4.rs
+++ b/exercises/variables/variables4.rs
@@ -1,9 +1,7 @@
// variables4.rs
// Make me compile! Execute the command `rustlings hint variables4` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
- let x: i32;
+ let x: i32 = 0;
println!("Number {}", x);
}
diff --git a/exercises/variables/variables5.rs b/exercises/variables/variables5.rs
index da37ae9..8d7512f 100644
--- a/exercises/variables/variables5.rs
+++ b/exercises/variables/variables5.rs
@@ -1,11 +1,12 @@
// variables5.rs
// Make me compile! Execute the command `rustlings hint variables5` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
- let number = "T-H-R-E-E";
+ let mut number = "T-H-R-E-E";
println!("Spell a Number : {}", number);
- number = 3;
- println!("Number plus two is : {}", number + 2);
+ let number = &3.to_string();
+ println!(
+ "Number plus two is : {}",
+ number.parse::<i32>().unwrap() + 2
+ );
}
diff --git a/exercises/variables/variables6.rs b/exercises/variables/variables6.rs
index 9866691..2ad47aa 100644
--- a/exercises/variables/variables6.rs
+++ b/exercises/variables/variables6.rs
@@ -1,9 +1,7 @@
// variables6.rs
// Make me compile! Execute the command `rustlings hint variables6` if you want a hint :)
-// I AM NOT DONE
-
-const NUMBER = 3;
+const NUMBER: i32 = 3;
fn main() {
println!("Number {}", NUMBER);
}