Completed Exercises.

This commit is contained in:
Ada Werefox 2023-03-24 21:18:51 +00:00
parent fc9fb536ca
commit 238ffe19d7
94 changed files with 448 additions and 352 deletions

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@ -6,12 +6,10 @@
// check clippy's suggestions from the output to solve the exercise.
// Execute `rustlings hint clippy1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::f32;
fn main() {
let pi = 3.14f32;
let pi = std::f32::consts::PI;
let radius = 5.00f32;
let area = pi * f32::powi(radius, 2);

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@ -1,12 +1,10 @@
// clippy2.rs
// Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let mut res = 42;
let option = Some(12);
for x in option {
if let Some(x) = option {
res += x;
}
println!("{}", res);

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@ -1,28 +1,27 @@
// clippy3.rs
// Here's a couple more easy Clippy fixes, so you can see its utility.
// I AM NOT DONE
use std::mem;
#[allow(unused_variables, unused_assignments)]
fn main() {
let my_option: Option<()> = None;
if my_option.is_none() {
if let Some(..) = my_option {
my_option.unwrap();
}
let my_arr = &[
-1, -2, -3
-1, -2, -3,
-4, -5, -6
];
println!("My array! Here it is: {:?}", my_arr);
let my_empty_vec = vec![1, 2, 3, 4, 5].resize(0, 5);
let my_empty_vec: Vec<i32> = Vec::new();
println!("This Vec is empty, see? {:?}", my_empty_vec);
let mut value_a = 45;
let mut value_b = 66;
// Let's swap these two!
value_a = value_b;
value_b = value_a;
mem::swap(&mut value_a, &mut value_b);
println!("value a: {}; value b: {}", value_a, value_b);
}

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@ -3,25 +3,23 @@
// and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
// Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
// Obtain the number of bytes (not characters) in the given argument.
// TODO: Add the AsRef trait appropriately as a trait bound.
fn byte_counter<T>(arg: T) -> usize {
fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
arg.as_ref().as_bytes().len()
}
// Obtain the number of characters (not bytes) in the given argument.
// TODO: Add the AsRef trait appropriately as a trait bound.
fn char_counter<T>(arg: T) -> usize {
fn char_counter<T: AsRef<str>>(arg: T) -> usize {
arg.as_ref().chars().count()
}
// Squares a number using as_mut().
// TODO: Add the appropriate trait bound.
fn num_sq<T>(arg: &mut T) {
fn num_sq<T: AsMut<u32> + AsRef<u32>>(arg: &mut T) {
// TODO: Implement the function body.
???
*arg.as_mut() = arg.as_ref().pow(2);
}
#[cfg(test)]

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@ -35,10 +35,45 @@ impl Default for Person {
// If while parsing the age, something goes wrong, then return the default of Person
// Otherwise, then return an instantiated Person object with the results
// I AM NOT DONE
impl From<&str> for Person {
fn from(s: &str) -> Person {
let mut split = s.split(",");
let mut name: String = String::from("John");
let mut age: usize = 30;
let default_person = Person { name: name.clone(), age: age.clone() };
if split.clone().count() > 2 {
return default_person;
}
match split.next() {
Some(ss) => {
if !ss.is_empty() {
name = String::from(ss);
} else {
return default_person;
}
}
_ => return default_person,
}
match split.next() {
Some(ss) => {
if !ss.is_empty() {
let temp_age = ss.parse::<usize>();
if temp_age.is_ok() {
age = temp_age.unwrap_or(30);
} else {
name = String::from("John");
}
} else {
return default_person;
}
}
_ => name = String::from("John"),
}
Person { name, age }
}
}

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@ -28,8 +28,6 @@ enum ParsePersonError {
ParseInt(ParseIntError),
}
// I AM NOT DONE
// Steps:
// 1. If the length of the provided string is 0, an error should be returned
// 2. Split the given string on the commas present in it
@ -46,6 +44,37 @@ enum ParsePersonError {
impl FromStr for Person {
type Err = ParsePersonError;
fn from_str(s: &str) -> Result<Person, Self::Err> {
// Attempt to split input str
let mut split = s.split(",");
// Return an error if there are not exactly two resulting elements
if split.clone().count() != 2 {
if s.is_empty() {
// There's nothing here
return Err(ParsePersonError::Empty);
} else {
// There's either not enough or too much here
return Err(ParsePersonError::BadLen);
}
}
// Attempt to grab name
let name = split.next().unwrap().to_string();
// Make sure the name isn't empty
if name.is_empty() {
return Err(ParsePersonError::NoName);
}
// Attempt to grab age
let age = match split.next().unwrap().parse::<usize>() {
// Yay we have a usable age
Ok(a) => a,
// Wait this isn't a number
Err(e) => return Err(ParsePersonError::ParseInt(e)),
};
Ok(Person { name, age })
}
}

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@ -23,8 +23,6 @@ enum IntoColorError {
IntConversion,
}
// I AM NOT DONE
// Your task is to complete this implementation
// and return an Ok result of inner type Color.
// You need to create an implementation for a tuple of three integers,
@ -38,6 +36,26 @@ enum IntoColorError {
impl TryFrom<(i16, i16, i16)> for Color {
type Error = IntoColorError;
fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {
let mut tuplearr = [tuple.0, tuple.1, tuple.2];
let mut colorout: Color = Color {
red: 0,
green: 0,
blue: 0,
};
for (index, color) in tuplearr.iter().enumerate() {
match color {
0..=255 => match index {
0 => colorout.red = color.to_ne_bytes()[0],
1 => colorout.green = color.to_ne_bytes()[0],
2 => colorout.blue = color.to_ne_bytes()[0],
_ => continue,
},
_ => return Err(IntoColorError::IntConversion),
}
}
Ok(colorout)
}
}
@ -45,6 +63,25 @@ impl TryFrom<(i16, i16, i16)> for Color {
impl TryFrom<[i16; 3]> for Color {
type Error = IntoColorError;
fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {
let mut colorout: Color = Color {
red: 0,
green: 0,
blue: 0,
};
for (index, color) in arr.iter().enumerate() {
match color {
0..=255 => match index {
0 => colorout.red = color.to_ne_bytes()[0],
1 => colorout.green = color.to_ne_bytes()[0],
2 => colorout.blue = color.to_ne_bytes()[0],
_ => continue,
},
_ => return Err(IntoColorError::IntConversion),
}
}
Ok(colorout)
}
}
@ -52,6 +89,29 @@ impl TryFrom<[i16; 3]> for Color {
impl TryFrom<&[i16]> for Color {
type Error = IntoColorError;
fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {
let mut colorout: Color = Color {
red: 0,
green: 0,
blue: 0,
};
if slice.len() != 3 {
return Err(IntoColorError::BadLen);
}
for (index, color) in slice.iter().enumerate() {
match color {
0..=255 => match index {
0 => colorout.red = color.to_ne_bytes()[0],
1 => colorout.green = color.to_ne_bytes()[0],
2 => colorout.blue = color.to_ne_bytes()[0],
_ => continue,
},
_ => return Err(IntoColorError::IntConversion),
}
}
Ok(colorout)
}
}

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@ -6,11 +6,9 @@
// and returns the proper type.
// Execute `rustlings hint using_as` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn average(values: &[f64]) -> f64 {
let total = values.iter().sum::<f64>();
total / values.len()
total / values.len() as f64
}
fn main() {

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@ -1,11 +1,13 @@
// enums1.rs
// No hints this time! ;)
// I AM NOT DONE
#[derive(Debug)]
enum Message {
// TODO: define a few types of messages as used below
Quit,
Echo,
Move,
ChangeColor
}
fn main() {

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@ -1,11 +1,13 @@
// enums2.rs
// Execute `rustlings hint enums2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[derive(Debug)]
enum Message {
// TODO: define the different variants used below
Move { x: i32, y: i32 },
Echo(String),
ChangeColor(u32, u32, u32),
Quit,
}
impl Message {

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@ -2,10 +2,12 @@
// Address all the TODOs to make the tests pass!
// Execute `rustlings hint enums3` or use the `hint` watch subcommand for a hint.
// 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,
}
struct Point {
@ -39,6 +41,13 @@ impl State {
fn process(&mut self, message: Message) {
// TODO: create a match expression to process the different message variants
// Remember: When passing a tuple as a function argument, you'll need extra parentheses: fn function((t, u, p, l, e))
match message {
Message::Move(position) => self.move_position(position),
Message::ChangeColor(c1, c2, c3) => self.change_color((c1, c2, c3)),
Message::Echo(s) => self.echo(s),
Message::Quit => self.quit(),
_ => (),
}
}
}

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@ -5,14 +5,12 @@
// construct to `Option` that can be used to express error conditions. Let's use it!
// Execute `rustlings hint errors1` or use the `hint` watch subcommand for a hint.
// 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.is_empty() {
// Empty names aren't allowed.
None
Err("`name` was empty; it must be nonempty.".into())
} else {
Some(format!("Hi! My name is {}", name))
Ok(format!("Hi! My name is {}", name).into())
}
}

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@ -17,16 +17,15 @@
// one is a lot shorter!
// Execute `rustlings hint errors2` or use the `hint` watch subcommand for a hint.
// 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>();
Ok(qty * cost_per_item + processing_fee)
match item_quantity.parse::<i32>() {
Ok(q) => Ok(q * cost_per_item + processing_fee),
Err(e) => return Err(e)
}
}
#[cfg(test)]

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@ -4,11 +4,10 @@
// Why not? What should we do to fix it?
// Execute `rustlings hint errors3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::num::ParseIntError;
use std::error::Error;
fn main() {
fn main() -> Result<(), Box<dyn Error>> {
let mut tokens = 100;
let pretend_user_input = "8";
@ -20,6 +19,7 @@ fn main() {
tokens -= cost;
println!("You now have {} tokens.", tokens);
}
Ok(())
}
pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {

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@ -1,8 +1,6 @@
// errors4.rs
// Execute `rustlings hint errors4` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[derive(PartialEq, Debug)]
struct PositiveNonzeroInteger(u64);
@ -15,7 +13,13 @@ enum CreationError {
impl PositiveNonzeroInteger {
fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
// Hmm...? Why is this only returning an Ok value?
Ok(PositiveNonzeroInteger(value as u64))
if value >= 0 {
if value == 0 {
return Err(CreationError::Zero);
}
return Ok(PositiveNonzeroInteger(value as u64));
}
return Err(CreationError::Negative);
}
}

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@ -16,14 +16,12 @@
// Execute `rustlings hint errors5` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::error;
use std::fmt;
use std::num::ParseIntError;
// TODO: update the return type of `main()` to make this compile.
fn main() -> Result<(), Box<dyn ???>> {
fn main() -> Result<(), Box<dyn error::Error>> {
let pretend_user_input = "42";
let x: i64 = pretend_user_input.parse()?;
println!("output={:?}", PositiveNonzeroInteger::new(x)?);

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@ -8,8 +8,6 @@
// Execute `rustlings hint errors6` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::num::ParseIntError;
// This is a custom error type that we will be using in `parse_pos_nonzero()`.
@ -25,13 +23,21 @@ impl ParsePosNonzeroError {
}
// TODO: add another error conversion function here.
// fn from_parseint...
fn from_parseint(err: ParseIntError) -> ParsePosNonzeroError {
ParsePosNonzeroError::ParseInt(err)
}
}
fn parse_pos_nonzero(s: &str) -> Result<PositiveNonzeroInteger, ParsePosNonzeroError> {
// TODO: change this to return an appropriate error instead of panicking
// when `parse()` returns an error.
let x: i64 = s.parse().unwrap();
PositiveNonzeroInteger::new(x).map_err(ParsePosNonzeroError::from_creation)
match s.parse() {
Ok(x) => match PositiveNonzeroInteger::new(x).map_err(ParsePosNonzeroError::from_creation) {
Ok(y) => Ok(y),
Err(y) => Err(y),
}
Err(x) => Err(ParsePosNonzeroError::from_parseint(x)),
}
}
// Don't change anything below this line.

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@ -1,7 +1,9 @@
// functions1.rs
// Execute `rustlings hint functions1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn call_me() {
}
fn main() {
call_me();

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@ -1,13 +1,11 @@
// functions2.rs
// Execute `rustlings hint functions2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
call_me(3);
}
fn call_me(num:) {
fn call_me(num: i32) {
for i in 0..num {
println!("Ring! Call number {}", i + 1);
}

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@ -1,10 +1,8 @@
// functions3.rs
// Execute `rustlings hint functions3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
call_me();
call_me(1);
}
fn call_me(num: u32) {

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@ -7,14 +7,12 @@
// in the signatures for now. If anything, this is a good way to peek ahead
// to future exercises!)
// 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 {

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@ -1,13 +1,11 @@
// functions5.rs
// Execute `rustlings hint functions5` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let answer = square(3);
println!("The square of 3 is {}", answer);
}
fn square(num: i32) -> i32 {
num * num;
num * num
}

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@ -3,9 +3,7 @@
// Execute `rustlings hint generics1` or use the `hint` watch subcommand for a hint.
// 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");
}

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@ -3,14 +3,12 @@
// Execute `rustlings hint generics2` or use the `hint` watch subcommand for a hint.
// 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 }
}
}

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@ -10,17 +10,17 @@
//
// Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a hint.
// 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(); // TODO: declare your hash map here.
// 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"), 100);
basket.insert(String::from("pear"), 6);
basket
}

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@ -11,8 +11,6 @@
//
// Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap;
#[derive(Hash, PartialEq, Eq)]
@ -37,6 +35,7 @@ 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!
basket.entry(fruit).or_insert(1);
}
}

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@ -14,8 +14,6 @@
// Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap;
// A structure to store team name and its goal details.
@ -40,6 +38,21 @@ fn build_scores_table(results: String) -> HashMap<String, Team> {
// will be the number of goals conceded from team_2, and similarly
// goals scored by team_2 will be the number of goals conceded by
// team_1.
let mut update_score = scores.entry(team_1_name.clone()).or_insert(Team {
name: team_1_name.clone(),
goals_scored: 0,
goals_conceded: 0,
});
update_score.goals_scored += team_1_score;
update_score.goals_conceded += team_2_score;
let mut update_score = scores.entry(team_2_name.clone()).or_insert(Team {
name: team_2_name.clone(),
goals_scored: 0,
goals_conceded: 0,
});
update_score.goals_scored += team_2_score;
update_score.goals_conceded += team_1_score;
}
scores
}

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@ -1,13 +1,16 @@
// if1.rs
// Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
// 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
if a > b {
a
} else {
b
}
}
// Don't mind this for now :)

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@ -4,13 +4,13 @@
// Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
// Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
pub fn foo_if_fizz(fizzish: &str) -> &str {
if fizzish == "fizz" {
"foo"
} else if fizzish == "fuzz" {
"bar"
} else {
1
"baz"
}
}

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@ -9,7 +9,6 @@
// when you change one of the lines below! Try adding a `println!` line, or try changing
// what it outputs in your terminal. Try removing a semicolon and see what happens!
// I AM NOT DONE
fn main() {
println!("Hello and");

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@ -2,8 +2,7 @@
// Make the code print a greeting to the world.
// Execute `rustlings hint intro2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
println!("Hello {}!");
println!("Hello World!");
}

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@ -8,17 +8,15 @@
//
// Execute `rustlings hint iterators1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
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 3
assert_eq!(my_iterable_fav_fruits.next(), Some(&"peach")); // TODO: Step 3
assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry"));
assert_eq!(my_iterable_fav_fruits.next(), ???); // TODO: Step 4
assert_eq!(my_iterable_fav_fruits.next(), None); // TODO: Step 4
}

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@ -3,8 +3,6 @@
// can offer. Follow the steps to complete the exercise.
// Execute `rustlings hint iterators2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
// Step 1.
// Complete the `capitalize_first` function.
// "hello" -> "Hello"
@ -12,7 +10,7 @@ pub fn capitalize_first(input: &str) -> String {
let mut c = input.chars();
match c.next() {
None => String::new(),
Some(first) => ???,
Some(first) => first.to_uppercase().to_string() + &input[1..],
}
}
@ -21,7 +19,7 @@ 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![]
words.iter().map(|w| capitalize_first(w)).collect()
}
// Step 3.
@ -29,7 +27,7 @@ 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()
words.iter().map(|w| capitalize_first(w)).collect()
}
#[cfg(test)]

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@ -6,8 +6,6 @@
// list_of_results functions.
// Execute `rustlings hint iterators3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[derive(Debug, PartialEq, Eq)]
pub enum DivisionError {
NotDivisible(NotDivisibleError),
@ -23,21 +21,46 @@ 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> {
todo!();
match b {
0 => Err(DivisionError::DivideByZero),
_ => match a % b {
0 => Ok(a / b),
_ => 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() -> () {
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));
match numbers
.into_iter()
.map(|n| match divide(n, 27) {
Ok(r) => Ok(r),
Err(e) => return Err(e),
})
.collect()
{
Ok(v) => Ok(v),
Err(e) => Err(e),
}
}
// 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));
numbers
.into_iter()
.map(|n| match divide(n, 27) {
Ok(r) => Ok(r),
Err(e) => return Err(e),
})
.collect()
}
#[cfg(test)]

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@ -1,8 +1,6 @@
// iterators4.rs
// Execute `rustlings hint iterators4` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
pub fn factorial(num: u64) -> u64 {
// Complete this function to return the factorial of num
// Do not use:
@ -13,6 +11,7 @@ pub fn factorial(num: u64) -> u64 {
// For an extra challenge, don't use:
// - recursion
// Execute `rustlings hint iterators4` for hints.
(1..=num).product()
}
#[cfg(test)]

View File

@ -10,8 +10,6 @@
//
// Make the code compile and the tests pass.
// I AM NOT DONE
use std::collections::HashMap;
#[derive(Clone, Copy, PartialEq, Eq)]
@ -34,7 +32,12 @@ 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, ... }
todo!();
map.values()
.map(|x| match x {
Progress::Complete => 1,
_ => 0,
})
.sum()
}
fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
@ -53,7 +56,7 @@ fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Pr
// collection is a slice of hashmaps.
// collection = [{ "variables1": Complete, "from_str": None, ... },
// { "variables2": Complete, ... }, ... ]
todo!();
collection.iter().map(|x| count_iterator(x, value)).sum()
}
#[cfg(test)]

View File

@ -7,9 +7,7 @@
//
// Execute `rustlings hint lifetimes1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn longest(x: &str, y: &str) -> &str {
fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
if x.len() > y.len() {
x
} else {

View File

@ -6,8 +6,6 @@
//
// Execute `rustlings hint lifetimes2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
if x.len() > y.len() {
x
@ -19,9 +17,7 @@ fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
fn main() {
let string1 = String::from("long string is long");
let result;
{
let string2 = String::from("xyz");
result = longest(string1.as_str(), string2.as_str());
}
println!("The longest string is '{}'", result);
}

View File

@ -4,11 +4,9 @@
//
// Execute `rustlings hint lifetimes3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
struct Book {
author: &str,
title: &str,
struct Book<'a> {
author: &'a str,
title: &'a str,
}
fn main() {

View File

@ -1,8 +1,7 @@
// macros1.rs
// Execute `rustlings hint macros1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[macro_export]
macro_rules! my_macro {
() => {
println!("Check out my macro!");
@ -10,5 +9,5 @@ macro_rules! my_macro {
}
fn main() {
my_macro();
my_macro!();
}

View File

@ -1,14 +1,13 @@
// macros2.rs
// Execute `rustlings hint macros2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
my_macro!();
}
#[macro_export]
macro_rules! my_macro {
() => {
println!("Check out my macro!");
};
}
fn main() {
my_macro!();
}

View File

@ -2,9 +2,8 @@
// Make me compile, without taking the macro out of the module!
// Execute `rustlings hint macros3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
mod macros {
#[macro_export]
macro_rules! my_macro {
() => {
println!("Check out my macro!");

View File

@ -1,15 +1,14 @@
// macros4.rs
// Execute `rustlings hint macros4` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[macro_export]
macro_rules! my_macro {
() => {
println!("Check out my macro!");
}
};
($val:expr) => {
println!("Look at this other macro: {}", $val);
}
};
}
fn main() {

View File

@ -1,15 +1,13 @@
// modules1.rs
// Execute `rustlings hint modules1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
mod sausage_factory {
// Don't let anybody outside of this module see this!
fn get_secret_recipe() -> String {
String::from("Ginger")
}
fn make_sausage() {
pub fn make_sausage() {
get_secret_recipe();
println!("sausage!");
}

View File

@ -3,12 +3,10 @@
// 'use' and 'as' keywords. Fix these 'use' statements to make the code compile.
// Execute `rustlings hint modules2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
mod delicious_snacks {
// TODO: Fix these use statements
use self::fruits::PEAR as ???
use self::veggies::CUCUMBER as ???
pub use self::fruits::PEAR as fruit;
pub use self::veggies::CUCUMBER as veggie;
mod fruits {
pub const PEAR: &'static str = "Pear";

View File

@ -5,10 +5,8 @@
// from the std::time module. Bonus style points if you can do it with one line!
// Execute `rustlings hint modules3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
// TODO: Complete this use statement
use ???
use std::time::{SystemTime, UNIX_EPOCH};
fn main() {
match SystemTime::now().duration_since(UNIX_EPOCH) {

View File

@ -1,12 +1,10 @@
// move_semantics1.rs
// Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand for a hint.
// 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);

View File

@ -2,12 +2,10 @@
// Make me compile without changing line 13 or moving line 10!
// Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let vec0 = Vec::new();
let mut vec1 = fill_vec(vec0);
let mut vec1 = fill_vec(vec0.clone());
// Do not change the following line!
println!("{} has length {} content `{:?}`", "vec0", vec0.len(), vec0);

View File

@ -3,12 +3,10 @@
// (no lines with multiple semicolons necessary!)
// Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let vec0 = Vec::new();
let mut vec1 = fill_vec(vec0);
let mut vec1 = fill_vec(vec0.clone());
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
@ -17,10 +15,10 @@ 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);
vec
vec.to_vec()
}

View File

@ -4,12 +4,10 @@
// function.
// Execute `rustlings hint move_semantics4` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let vec0 = Vec::new();
// 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 +18,7 @@ fn main() {
// `fill_vec()` no longer takes `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);

View File

@ -3,13 +3,11 @@
// adding, changing or removing any of them.
// Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let mut x = 100;
let y = &mut x;
let z = &mut x;
*y += 100;
let z = &mut x;
*z += 1000;
assert_eq!(x, 1200);
}

View File

@ -2,24 +2,22 @@
// Execute `rustlings hint move_semantics6` or use the `hint` watch subcommand for a hint.
// You can't change anything except adding or removing references.
// I AM NOT DONE
fn main() {
let data = "Rust is great!".to_string();
get_char(data);
get_char(&data);
string_uppercase(&data);
string_uppercase(data);
}
// Should not take ownership
fn get_char(data: String) -> char {
fn get_char(data: &String) -> char {
data.chars().last().unwrap()
}
// Should take ownership
fn string_uppercase(mut data: &String) {
data = &data.to_uppercase();
fn string_uppercase(mut data: String) {
data = data.to_uppercase();
println!("{}", data);
}

View File

@ -1,8 +1,6 @@
// options1.rs
// Execute `rustlings hint options1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
// This function returns how much icecream there is left in the fridge.
// If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them
// all, so there'll be no more left :(
@ -10,7 +8,11 @@ fn maybe_icecream(time_of_day: u16) -> Option<u16> {
// We use the 24-hour system here, so 10PM is a value of 22 and 12AM is a value of 0
// The Option output should gracefully handle cases where time_of_day > 23.
// TODO: Complete the function body - remember to return an Option!
???
match time_of_day {
22..=23 => Some(0),
0..=21 => Some(5),
_ => None,
}
}
#[cfg(test)]
@ -29,7 +31,10 @@ mod tests {
#[test]
fn raw_value() {
// TODO: Fix this test. How do you get at the value contained in the Option?
let icecreams = maybe_icecream(12);
let icecreams = match maybe_icecream(12) {
Some(n) => n,
None => 0,
};
assert_eq!(icecreams, 5);
}
}

View File

@ -1,8 +1,6 @@
// options2.rs
// Execute `rustlings hint options2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[cfg(test)]
mod tests {
#[test]
@ -11,7 +9,7 @@ mod tests {
let optional_target = Some(target);
// TODO: Make this an if let statement whose value is "Some" type
word = optional_target {
if let Some(word) = optional_target {
assert_eq!(word, target);
}
}
@ -26,7 +24,7 @@ mod tests {
// 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.pop() {
while let Some(Some(integer)) = optional_integers.pop() {
assert_eq!(integer, range);
range -= 1;
}

View File

@ -1,15 +1,13 @@
// options3.rs
// Execute `rustlings hint options3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
struct Point {
x: i32,
y: i32,
}
fn main() {
let y: Option<Point> = Some(Point { x: 100, y: 200 });
let y: Option<&Point> = Some(&Point { x: 100, y: 200 });
match y {
Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y),

View File

@ -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`)
@ -12,7 +10,7 @@ fn main() {
println!("Good morning!");
}
let // Finish the rest of this line like the example! Or make it be false!
let is_evening = false; // Finish the rest of this line like the example! Or make it be false!
if is_evening {
println!("Good evening!");
}

View File

@ -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`)
@ -18,7 +16,7 @@ fn main() {
println!("Neither alphabetic nor numeric!");
}
let // Finish this line like the example! What's your favorite character?
let your_character = '🔥'; // 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() {

View File

@ -2,10 +2,8 @@
// Create an array with at least 100 elements in it where the ??? is.
// Execute `rustlings hint primitive_types3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let a = ???
let a = [0; 100];
if a.len() >= 100 {
println!("Wow, that's a big array!");

View File

@ -2,13 +2,11 @@
// Get a slice out of Array a where the ??? is so that the test passes.
// Execute `rustlings hint primitive_types4` or use the `hint` watch subcommand for a hint.
// 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)
}

View File

@ -2,11 +2,9 @@
// Destructure the `cat` tuple so that the println will work.
// Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand for a hint.
// 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);
}

View File

@ -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` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[test]
fn indexing_tuple() {
let numbers = (1, 2, 3);
// Replace below ??? with the tuple indexing syntax.
let second = ???;
let second: &usize = &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!")
}

View File

@ -10,10 +10,14 @@
// Write a function that calculates the price of an order of apples given
// the quantity bought. No hints this time!
// I AM NOT DONE
// Put your function here!
// fn calculate_price_of_apples {
fn calculate_price_of_apples(apples: u32) -> u32 {
if apples > 40 {
apples
} else {
apples * 2
}
}
// Don't modify this function!
#[test]

View File

@ -18,8 +18,6 @@
// - The output element is going to be a Vector of strings.
// No hints this time!
// I AM NOT DONE
pub enum Command {
Uppercase,
Trim,
@ -30,11 +28,23 @@ mod my_module {
use super::Command;
// TODO: Complete the function signature!
pub fn transformer(input: ???) -> ??? {
pub fn transformer(input: Vec<(String, Command)>) -> Vec<String> {
// TODO: Complete the output declaration!
let mut output: ??? = vec![];
let mut output: Vec<String> = vec![];
for (string, command) in input.iter() {
// TODO: Complete the function body. You can do it!
match command {
Command::Uppercase => output.push(string.to_uppercase()),
Command::Trim => output.push(
string
.trim_start_matches(" ")
.trim_end_matches(" ")
.to_string(),
),
Command::Append(n) => {
output.push(String::from(string.clone()) + "bar".repeat(*n).as_str())
}
};
}
output
}
@ -43,7 +53,7 @@ mod my_module {
#[cfg(test)]
mod tests {
// TODO: What do we need to import to have `transformer` in scope?
use ???;
use super::my_module::transformer;
use super::Command;
#[test]

View File

@ -14,15 +14,13 @@
// Execute `rustlings hint quiz3` or use the `hint` watch subcommand for a hint.
// 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)
@ -50,7 +48,7 @@ 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+".to_string(),
student_name: "Gary Plotter".to_string(),
student_age: 11,
};

View File

@ -18,19 +18,17 @@
// where the second TODO comment is. Try not to create any copies of the `numbers` Vec!
// Execute `rustlings hint arc1` or use the `hint` watch subcommand for a hint.
// 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 sum: u32 = child_numbers.iter().filter(|n| *n % 8 == offset).sum();
println!("Sum of offset {} is {}", offset, sum);

View File

@ -16,11 +16,9 @@
//
// Execute `rustlings hint box1` or use the `hint` watch subcommand for a hint.
// 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 {
todo!()
List::Nil
}
pub fn create_non_empty_list() -> List {
todo!()
List::Cons(1, Box::new(create_empty_list()))
}
#[cfg(test)]

View File

@ -5,8 +5,6 @@
// It can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required.
// The type is designed to work with general borrowed data via the Borrow trait.
// I AM NOT DONE
use std::borrow::Cow;
fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
@ -41,8 +39,7 @@ fn main() {
let slice = vec![-1, 0, 1];
let mut input = Cow::from(slice);
match abs_all(&mut input) {
// TODO
Cow::Borrowed(_) => println!("I own this slice!"),
Cow::Owned(_) => println!("I own this slice!"),
_ => panic!("expected borrowed value"),
}
}

View File

@ -5,8 +5,6 @@
// Make this code compile by using the proper Rc primitives to express that the sun has multiple owners.
// I AM NOT DONE
use std::rc::Rc;
#[derive(Debug)]
@ -55,17 +53,17 @@ fn main() {
jupiter.details();
// TODO
let saturn = Planet::Saturn(Rc::new(Sun {}));
let saturn = Planet::Saturn(Rc::clone(&sun));
println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
saturn.details();
// TODO
let uranus = Planet::Uranus(Rc::new(Sun {}));
let uranus = Planet::Uranus(Rc::clone(&sun));
println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
uranus.details();
// TODO
let neptune = Planet::Neptune(Rc::new(Sun {}));
let neptune = Planet::Neptune(Rc::clone(&sun));
println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
neptune.details();
@ -86,13 +84,13 @@ fn main() {
drop(mars);
println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
// TODO
drop(earth);
println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
// TODO
drop(venus);
println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
// TODO
drop(mercury);
println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
assert_eq!(Rc::strong_count(&sun), 1);

View File

@ -2,13 +2,11 @@
// Make me compile without changing the function signature!
// Execute `rustlings hint strings1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let answer = current_favorite_color();
println!("My current favorite color is {}", answer);
}
fn current_favorite_color() -> String {
"blue"
String::from("blue")
}

View File

@ -2,11 +2,9 @@
// Make me compile without changing the function signature!
// Execute `rustlings hint strings2` or use the `hint` watch subcommand for a hint.
// 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.");

View File

@ -1,21 +1,19 @@
// strings3.rs
// Execute `rustlings hint strings3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn trim_me(input: &str) -> String {
// TODO: Remove whitespace from both ends of a string!
???
input.trim_start_matches(" ").trim_end_matches(" ").to_string()
}
fn compose_me(input: &str) -> String {
// TODO: Add " world!" to the string! There's multiple ways to do this!
???
format!("{} world!", input.to_string())
}
fn replace_me(input: &str) -> String {
// TODO: Replace "cars" in the string with "balloons"!
???
input.replace("cars", "balloons")
}
#[cfg(test)]

View File

@ -6,8 +6,6 @@
// before the parentheses on each line. If you're right, it will compile!
// No hints this time!
// I AM NOT DONE
fn string_slice(arg: &str) {
println!("{}", arg);
}
@ -16,14 +14,14 @@ 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());
}

View File

@ -2,13 +2,13 @@
// Address all the TODOs to make the tests pass!
// Execute `rustlings hint structs1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
struct ColorClassicStruct {
// TODO: Something goes here
red: u32,
green: u32,
blue: u32,
}
struct ColorTupleStruct(/* TODO: Something goes here */);
struct ColorTupleStruct(u32, u32, u32);
#[derive(Debug)]
struct UnitLikeStruct;
@ -20,7 +20,11 @@ mod tests {
#[test]
fn classic_c_structs() {
// TODO: Instantiate a classic c struct!
// let green =
let green = ColorClassicStruct {
red: 0,
green: 255,
blue: 0,
};
assert_eq!(green.red, 0);
assert_eq!(green.green, 255);
@ -30,7 +34,7 @@ mod tests {
#[test]
fn tuple_structs() {
// TODO: Instantiate a tuple struct!
// let green =
let green = ColorTupleStruct(0, 255, 0);
assert_eq!(green.0, 0);
assert_eq!(green.1, 255);
@ -40,7 +44,7 @@ mod tests {
#[test]
fn unit_structs() {
// TODO: Instantiate a unit-like struct!
// let unit_like_struct =
let unit_like_struct = UnitLikeStruct;
let message = format!("{:?}s are fun!", unit_like_struct);
assert_eq!(message, "UnitLikeStructs are fun!");

View File

@ -2,8 +2,6 @@
// Address all the TODOs to make the tests pass!
// Execute `rustlings hint structs2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[derive(Debug)]
struct Order {
name: String,
@ -35,7 +33,11 @@ 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: String::from("Hacker in Rust"),
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);

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@ -4,8 +4,6 @@
// Make the code compile and the tests pass!
// Execute `rustlings hint structs3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[derive(Debug)]
struct Package {
sender_country: String,
@ -26,12 +24,14 @@ impl Package {
}
}
fn is_international(&self) -> ??? {
fn is_international(&self) -> bool {
// Something goes here...
self.sender_country != self.recipient_country
}
fn get_fees(&self, cents_per_gram: i32) -> ??? {
fn get_fees(&self, cents_per_gram: i32) -> i32 {
// Something goes here...
self.weight_in_grams * cents_per_gram
}
}

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@ -7,12 +7,10 @@
// pass! Make the test fail!
// Execute `rustlings hint tests1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[cfg(test)]
mod tests {
#[test]
fn you_can_assert() {
assert!();
assert!(true);
}
}

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@ -3,12 +3,10 @@
// pass! Make the test fail!
// Execute `rustlings hint tests2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[cfg(test)]
mod tests {
#[test]
fn you_can_assert_eq() {
assert_eq!();
assert_eq!(1, 1);
}
}

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@ -4,8 +4,6 @@
// we expect to get when we call `is_even(5)`.
// Execute `rustlings hint tests3` or use the `hint` watch subcommand for a hint.
// 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(2));
}
#[test]
fn is_false_when_odd() {
assert!();
assert!(!is_even(5));
}
}

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@ -6,8 +6,6 @@
// The program should wait until all the spawned threads have finished and
// should collect their return values into a vector.
// I AM NOT DONE
use std::thread;
use std::time::{Duration, Instant};
@ -25,6 +23,7 @@ fn main() {
let mut results: Vec<u128> = vec![];
for handle in handles {
// TODO: a struct is returned from thread::spawn, can you use it?
results.push(handle.join().unwrap());
}
if results.len() != 10 {

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@ -3,9 +3,7 @@
// Building on the last exercise, we want all of the threads to complete their work but this time
// the spawned threads need to be in charge of updating a shared value: JobStatus.jobs_completed
// I AM NOT DONE
use std::sync::Arc;
use std::sync::{Arc, Mutex};
use std::thread;
use std::time::Duration;
@ -14,14 +12,15 @@ struct JobStatus {
}
fn main() {
let status = Arc::new(JobStatus { jobs_completed: 0 });
let status = Arc::new(Mutex::new(JobStatus { jobs_completed: 0 }));
let mut handles = vec![];
for _ in 0..10 {
let status_shared = Arc::clone(&status);
let handle = thread::spawn(move || {
thread::sleep(Duration::from_millis(250));
// TODO: You must take an action before you update a shared value
status_shared.jobs_completed += 1;
let mut jorb = status_shared.lock().unwrap();
jorb.jobs_completed += 1;
});
handles.push(handle);
}
@ -29,6 +28,6 @@ fn main() {
handle.join().unwrap();
// TODO: Print the value of the JobStatus.jobs_completed. Did you notice anything
// interesting in the output? Do you have to 'join' on all the handles?
println!("jobs completed {}", ???);
println!("jobs completed {}", status.lock().unwrap().jobs_completed);
}
}

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@ -1,8 +1,6 @@
// threads3.rs
// Execute `rustlings hint threads3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::sync::mpsc;
use std::sync::Arc;
use std::thread;
@ -28,11 +26,13 @@ fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
let qc = Arc::new(q);
let qc1 = Arc::clone(&qc);
let qc2 = Arc::clone(&qc);
let tx1 = mpsc::Sender::clone(&tx);
let tx2 = mpsc::Sender::clone(&tx);
thread::spawn(move || {
for val in &qc1.first_half {
println!("sending {:?}", val);
tx.send(*val).unwrap();
tx1.send(*val).unwrap();
thread::sleep(Duration::from_secs(1));
}
});
@ -40,7 +40,7 @@ fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
thread::spawn(move || {
for val in &qc2.second_half {
println!("sending {:?}", val);
tx.send(*val).unwrap();
tx2.send(*val).unwrap();
thread::sleep(Duration::from_secs(1));
}
});

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@ -9,14 +9,15 @@
// implementing this trait.
// Execute `rustlings hint traits1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
trait AppendBar {
fn append_bar(self) -> Self;
}
impl AppendBar for String {
// TODO: Implement `AppendBar` for type `String`.
fn append_bar(self) -> Self {
self + "Bar"
}
}
fn main() {

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@ -11,13 +11,18 @@
// you can do this!
// Execute `rustlings hint traits2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
trait AppendBar {
fn append_bar(self) -> Self;
}
// TODO: Implement trait `AppendBar` for a vector of strings.
impl AppendBar for Vec<String> {
fn append_bar(self) -> Self {
let mut out = self.clone();
out.push(String::from("Bar"));
out
}
}
#[cfg(test)]
mod tests {

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@ -7,10 +7,10 @@
// Consider what you can add to the Licensed trait.
// Execute `rustlings hint traits3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
pub trait Licensed {
fn licensing_info(&self) -> String;
fn licensing_info(&self) -> String {
String::from("Some information")
}
}
struct SomeSoftware {

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@ -4,8 +4,6 @@
// Don't change any line other than the marked one.
// Execute `rustlings hint traits4` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
pub trait Licensed {
fn licensing_info(&self) -> String {
"some information".to_string()
@ -20,7 +18,7 @@ impl Licensed for SomeSoftware {}
impl Licensed for OtherSoftware {}
// YOU MAY ONLY CHANGE THE NEXT LINE
fn compare_license_types(software: ??, software_two: ??) -> bool {
fn compare_license_types<T: Licensed, U: Licensed>(software: T, software_two: U) -> bool {
software.licensing_info() == software_two.licensing_info()
}

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@ -4,8 +4,6 @@
// Don't change any line other than the marked one.
// Execute `rustlings hint traits5` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
pub trait SomeTrait {
fn some_function(&self) -> bool {
true
@ -27,7 +25,7 @@ impl SomeTrait for OtherStruct {}
impl OtherTrait for OtherStruct {}
// YOU MAY ONLY CHANGE THE NEXT LINE
fn some_func(item: ??) -> bool {
fn some_func<T: SomeTrait + OtherTrait>(item: T) -> bool {
item.some_function() && item.other_function()
}

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@ -2,9 +2,7 @@
// Make me compile!
// Execute `rustlings hint variables1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
x = 5;
let x = 5;
println!("x has the value {}", x);
}

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@ -1,10 +1,8 @@
// variables2.rs
// Execute `rustlings hint variables2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let x;
let x = 10;
if x == 10 {
println!("x is ten!");
} else {

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@ -1,9 +1,7 @@
// variables3.rs
// Execute `rustlings hint variables3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let x: i32;
let x: i32 = 0;
println!("Number {}", x);
}

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@ -1,10 +1,8 @@
// variables4.rs
// Execute `rustlings hint variables4` or use the `hint` watch subcommand for 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);

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@ -1,11 +1,9 @@
// variables5.rs
// Execute `rustlings hint variables5` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() {
let number = "T-H-R-E-E"; // don't change this line
println!("Spell a Number : {}", number);
number = 3; // don't rename this variable
let number: i32 = 3; // don't rename this variable
println!("Number plus two is : {}", number + 2);
}

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@ -1,9 +1,7 @@
// variables6.rs
// Execute `rustlings hint variables6` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
const NUMBER = 3;
const NUMBER: i32 = 3;
fn main() {
println!("Number {}", NUMBER);
}

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@ -4,11 +4,9 @@
// Make me compile and pass the test!
// Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
// 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![10, 20, 30, 40]; // TODO: declare your vector here with the macro for vectors
(a, v)
}
@ -20,6 +18,6 @@ mod tests {
#[test]
fn test_array_and_vec_similarity() {
let (a, v) = array_and_vec();
assert_eq!(a, v[..]);
assert_eq!(a, *v);
}
}

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@ -6,13 +6,11 @@
//
// Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
// 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].
@ -20,11 +18,13 @@ fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
}
fn vec_map(v: &Vec<i32>) -> Vec<i32> {
v.iter().map(|num| {
v.iter()
.map(|num| {
// TODO: Do the same thing as above - but instead of mutating the
// Vec, you can just return the new number!
???
}).collect()
num * 2
})
.collect()
}
#[cfg(test)]