From c5a0b0316d46681eeda8c33524ff1f67ef16e1cd Mon Sep 17 00:00:00 2001 From: "Kartheek, Gottipati" Date: Tue, 3 May 2022 15:30:09 -0400 Subject: [PATCH] solutions --- exercises/advanced_errors/advanced_errs1.rs | 8 +++-- exercises/advanced_errors/advanced_errs2.rs | 13 ++++++-- exercises/clippy/clippy1.rs | 4 +-- exercises/clippy/clippy2.rs | 4 +-- exercises/collections/hashmap1.rs | 8 ++--- exercises/collections/hashmap2.rs | 6 +--- exercises/collections/vec1.rs | 4 +-- exercises/collections/vec2.rs | 5 +--- exercises/conversions/as_ref_mut.rs | 6 ++-- exercises/conversions/from_into.rs | 16 ++++++++-- exercises/conversions/from_str.rs | 22 ++++++++++++-- exercises/conversions/try_from_into.rs | 24 +++++++++++++-- exercises/conversions/using_as.rs | 4 +-- exercises/enums/enums1.rs | 7 +++-- exercises/enums/enums2.rs | 7 +++-- exercises/enums/enums3.rs | 22 +++++++++++--- exercises/error_handling/errors1.rs | 8 ++--- exercises/error_handling/errors2.rs | 7 +++-- exercises/error_handling/errors3.rs | 6 ++-- exercises/error_handling/errors4.rs | 8 +++-- exercises/error_handling/errors5.rs | 4 +-- exercises/error_handling/errors6.rs | 12 +++++--- exercises/functions/functions1.rs | 3 +- exercises/functions/functions2.rs | 4 +-- exercises/functions/functions3.rs | 4 +-- exercises/functions/functions4.rs | 4 +-- exercises/functions/functions5.rs | 4 +-- exercises/generics/generics1.rs | 4 +-- exercises/generics/generics2.rs | 10 +++---- exercises/generics/generics3.rs | 10 +++---- exercises/if/if1.rs | 8 +++-- exercises/if/if2.rs | 6 ++-- exercises/intro/intro1.rs | 2 -- exercises/intro/intro2.rs | 4 +-- exercises/macros/macros1.rs | 4 +-- exercises/macros/macros2.rs | 11 ++++--- exercises/macros/macros3.rs | 3 +- exercises/macros/macros4.rs | 6 ++-- exercises/modules/modules1.rs | 4 +-- exercises/modules/modules2.rs | 7 ++--- exercises/modules/modules3.rs | 4 +-- exercises/move_semantics/move_semantics1.rs | 4 +-- exercises/move_semantics/move_semantics2.rs | 12 ++++---- exercises/move_semantics/move_semantics3.rs | 4 +-- exercises/move_semantics/move_semantics4.rs | 8 ++--- exercises/move_semantics/move_semantics5.rs | 4 +-- exercises/move_semantics/move_semantics6.rs | 8 ++--- exercises/option/option1.rs | 10 +++---- exercises/option/option2.rs | 6 ++-- exercises/option/option3.rs | 4 +-- exercises/primitive_types/primitive_types1.rs | 4 +-- exercises/primitive_types/primitive_types2.rs | 4 +-- exercises/primitive_types/primitive_types3.rs | 8 ++--- exercises/primitive_types/primitive_types4.rs | 4 +-- exercises/primitive_types/primitive_types5.rs | 4 +-- exercises/primitive_types/primitive_types6.rs | 4 +-- exercises/quiz1.rs | 10 +++++-- exercises/quiz2.rs | 22 +++++++------- exercises/quiz3.rs | 6 ++-- exercises/quiz4.rs | 9 +++++- exercises/standard_library_types/arc1.rs | 6 ++-- exercises/standard_library_types/box1.rs | 8 ++--- .../standard_library_types/iterators1.rs | 10 +++---- .../standard_library_types/iterators2.rs | 8 ++--- .../standard_library_types/iterators3.rs | 30 ++++++++++++++----- .../standard_library_types/iterators4.rs | 3 +- .../standard_library_types/iterators5.rs | 11 +++++-- exercises/strings/strings1.rs | 4 +-- exercises/strings/strings2.rs | 4 +-- exercises/structs/structs1.rs | 15 +++++----- exercises/structs/structs2.rs | 14 +++++++-- exercises/structs/structs3.rs | 12 ++++---- exercises/tests/tests1.rs | 4 +-- exercises/tests/tests2.rs | 4 +-- exercises/tests/tests3.rs | 6 ++-- exercises/threads/threads1.rs | 11 ++++--- exercises/traits/traits1.rs | 7 +++-- exercises/traits/traits2.rs | 9 ++++-- exercises/variables/variables1.rs | 4 +-- exercises/variables/variables2.rs | 4 +-- exercises/variables/variables3.rs | 4 +-- exercises/variables/variables4.rs | 4 +-- exercises/variables/variables5.rs | 4 +-- exercises/variables/variables6.rs | 4 +-- 84 files changed, 323 insertions(+), 309 deletions(-) diff --git a/exercises/advanced_errors/advanced_errs1.rs b/exercises/advanced_errors/advanced_errs1.rs index 4bc7b635..c4f69618 100644 --- a/exercises/advanced_errors/advanced_errs1.rs +++ b/exercises/advanced_errors/advanced_errs1.rs @@ -7,8 +7,6 @@ // Make this code compile! Execute `rustlings hint advanced_errs1` for // hints :) -// I AM NOT DONE - use std::num::ParseIntError; use std::str::FromStr; @@ -24,9 +22,15 @@ impl From for ParsePosNonzeroError { fn from(e: CreationError) -> Self { // TODO: complete this implementation so that the `?` operator will // work for `CreationError` + ParsePosNonzeroError::Creation(e) } } +impl From for ParsePosNonzeroError { + fn from(e: ParseIntError) -> Self { + ParsePosNonzeroError::ParseInt(e) + } +} // TODO: implement another instance of the `From` trait here so that the // `?` operator will work in the other place in the `FromStr` // implementation below. diff --git a/exercises/advanced_errors/advanced_errs2.rs b/exercises/advanced_errors/advanced_errs2.rs index 54e669fd..038305a6 100644 --- a/exercises/advanced_errors/advanced_errs2.rs +++ b/exercises/advanced_errors/advanced_errs2.rs @@ -16,8 +16,6 @@ // 4. Complete the partial implementation of `Display` for // `ParseClimateError`. -// I AM NOT DONE - use std::error::Error; use std::fmt::{self, Display, Formatter}; use std::num::{ParseFloatError, ParseIntError}; @@ -46,10 +44,12 @@ impl From for ParseClimateError { // `ParseFloatError` values. impl From for ParseClimateError { fn from(e: ParseFloatError) -> Self { - // TODO: Complete this function + Self::ParseFloat(e) } } +impl Error for ParseClimateError {} + // TODO: Implement a missing trait so that `main()` below will compile. It // is not necessary to implement any methods inside the missing trait. @@ -62,7 +62,10 @@ impl Display for ParseClimateError { // Imports the variants to make the following code more compact. use ParseClimateError::*; match self { + Empty => write!(f, "empty input"), + BadLen => write!(f, "incorrect number of fields"), NoCity => write!(f, "no city name"), + ParseInt(e) => write!(f, "error parsing year: {}", e), ParseFloat(e) => write!(f, "error parsing temperature: {}", e), } } @@ -88,8 +91,12 @@ impl FromStr for Climate { // TODO: Complete this function by making it handle the missing error // cases. fn from_str(s: &str) -> Result { + if s.is_empty() { + return Err(ParseClimateError::Empty) + } let v: Vec<_> = s.split(',').collect(); let (city, year, temp) = match &v[..] { + ["", _, _] => return Err(ParseClimateError::NoCity), [city, year, temp] => (city.to_string(), year, temp), _ => return Err(ParseClimateError::BadLen), }; diff --git a/exercises/clippy/clippy1.rs b/exercises/clippy/clippy1.rs index c5f84a9c..0a5a6e39 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 - use std::f32; fn main() { - let pi = 3.14f32; + let pi = f32::consts::PI; let radius = 5.00f32; let area = pi * f32::powi(radius, 2); diff --git a/exercises/clippy/clippy2.rs b/exercises/clippy/clippy2.rs index 37af9ed0..4cdfbe75 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 64b5a7f3..b2095f03 100644 --- a/exercises/collections/hashmap1.rs +++ b/exercises/collections/hashmap1.rs @@ -11,17 +11,15 @@ // Execute the command `rustlings hint hashmap1` if you need // hints. -// I AM NOT DONE - use std::collections::HashMap; fn fruit_basket() -> HashMap { - 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"), 3); + basket.insert(String::from("mango"), 4); basket } diff --git a/exercises/collections/hashmap2.rs b/exercises/collections/hashmap2.rs index 0abe19ab..23eceaa6 100644 --- a/exercises/collections/hashmap2.rs +++ b/exercises/collections/hashmap2.rs @@ -12,8 +12,6 @@ // Execute the command `rustlings hint hashmap2` if you need // hints. -// I AM NOT DONE - use std::collections::HashMap; #[derive(Hash, PartialEq, Eq)] @@ -35,9 +33,7 @@ fn fruit_basket(basket: &mut HashMap) { ]; for fruit in fruit_kinds { - // 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(3); } } diff --git a/exercises/collections/vec1.rs b/exercises/collections/vec1.rs index b144fb94..170840e6 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 vec1` if you need hints. -// I AM NOT DONE - fn array_and_vec() -> ([i32; 4], Vec) { 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) } diff --git a/exercises/collections/vec2.rs b/exercises/collections/vec2.rs index 6595e401..fadcc0a2 100644 --- a/exercises/collections/vec2.rs +++ b/exercises/collections/vec2.rs @@ -7,12 +7,9 @@ // Execute the command `rustlings hint vec2` if you need // hints. -// I AM NOT DONE - fn vec_loop(mut v: Vec) -> Vec { 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]. diff --git a/exercises/conversions/as_ref_mut.rs b/exercises/conversions/as_ref_mut.rs index 84f4a60c..f1e5072e 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(arg: T) -> usize { +fn byte_counter>(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(arg: T) -> usize { +fn char_counter>(arg: T) -> usize { arg.as_ref().chars().count() } diff --git a/exercises/conversions/from_into.rs b/exercises/conversions/from_into.rs index 9d84174d..3e7aaf20 100644 --- a/exercises/conversions/from_into.rs +++ b/exercises/conversions/from_into.rs @@ -33,10 +33,22 @@ 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 parts: Vec<&str> = s.split(",").collect(); + if parts.len() == 2 && parts[0].len() > 0 { + let age: Result = parts[1].parse(); + if let Ok(age) = age { + Person { + name: parts[0].into(), + age: age, + } + } else { + Person::default() + } + } else { + Person::default() + } } } diff --git a/exercises/conversions/from_str.rs b/exercises/conversions/from_str.rs index ece0b3cf..9a684ca3 100644 --- a/exercises/conversions/from_str.rs +++ b/exercises/conversions/from_str.rs @@ -26,8 +26,6 @@ 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 @@ -41,6 +39,26 @@ enum ParsePersonError { impl FromStr for Person { type Err = ParsePersonError; fn from_str(s: &str) -> Result { + if s.len() == 0 { + return Err(ParsePersonError::Empty); + } + + let parts: Vec<&str> = s.split(",").collect(); + if parts.len() != 2 { + return Err(ParsePersonError::BadLen) + } + + if parts[0].len() == 0 { + return Err(ParsePersonError::NoName) + } + + match parts[1].parse() { + Ok(age) => Ok(Person { + name: parts[0].into(), + age: age + }), + Err(e) => Err(ParsePersonError::ParseInt(e)) + } } } diff --git a/exercises/conversions/try_from_into.rs b/exercises/conversions/try_from_into.rs index b8ec4455..5865d97d 100644 --- a/exercises/conversions/try_from_into.rs +++ b/exercises/conversions/try_from_into.rs @@ -21,8 +21,6 @@ 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, @@ -36,6 +34,18 @@ enum IntoColorError { impl TryFrom<(i16, i16, i16)> for Color { type Error = IntoColorError; fn try_from(tuple: (i16, i16, i16)) -> Result { + match tuple { + (r, g, b) if r < 0 || g < 0 || b < 0 || r > 255 || g > 255 || b > 255 => { + return Err(IntoColorError::IntConversion) + }, + (red, green, blue) => { + Ok(Color { + red: red as u8, + green: green as u8, + blue: blue as u8, + }) + } + } } } @@ -43,6 +53,11 @@ impl TryFrom<(i16, i16, i16)> for Color { impl TryFrom<[i16; 3]> for Color { type Error = IntoColorError; fn try_from(arr: [i16; 3]) -> Result { + if arr.len() != 3 { + return Err(IntoColorError::BadLen) + } + + arr[..].try_into() } } @@ -50,6 +65,11 @@ impl TryFrom<[i16; 3]> for Color { impl TryFrom<&[i16]> for Color { type Error = IntoColorError; fn try_from(slice: &[i16]) -> Result { + if slice.len() != 3 { + return Err(IntoColorError::BadLen) + } + + (slice[0], slice[1], slice[2]).try_into() } } diff --git a/exercises/conversions/using_as.rs b/exercises/conversions/using_as.rs index f3f745ff..97a06d0b 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().sum::(); - total / values.len() + total / values.len() as f64 } fn main() { diff --git a/exercises/enums/enums1.rs b/exercises/enums/enums1.rs index a2223d33..5f57a112 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 } fn main() { diff --git a/exercises/enums/enums2.rs b/exercises/enums/enums2.rs index ec32d952..c7be4ed6 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(i32, i32, i32), + Quit } impl Message { diff --git a/exercises/enums/enums3.rs b/exercises/enums/enums3.rs index 178b40c4..965a98f0 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 + Quit, + Move(Point), + Echo(String), + ChangeColor((u8, u8, u8)) } struct Point { @@ -36,7 +37,20 @@ impl State { } fn process(&mut self, message: Message) { - // TODO: create a match expression to process the different message variants + match message { + Message::ChangeColor(color) => { + self.color = color + }, + Message::Echo(text) => { + println!("{}", text) + }, + Message::Move(point) => { + self.position = point + }, + Message::Quit => { + self.quit = true + } + } } } diff --git a/exercises/error_handling/errors1.rs b/exercises/error_handling/errors1.rs index c417fb26..d348c7fd 100644 --- a/exercises/error_handling/errors1.rs +++ b/exercises/error_handling/errors1.rs @@ -5,14 +5,12 @@ // construct to `Option` that can be used to express error conditions. Let's use it! // Execute `rustlings hint errors1` for hints! -// I AM NOT DONE - -pub fn generate_nametag_text(name: String) -> Option { +pub fn generate_nametag_text(name: String) -> Result { 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(String::from("`name` was empty; it must be nonempty.")) } } diff --git a/exercises/error_handling/errors2.rs b/exercises/error_handling/errors2.rs index aad3a93f..4456e9c2 100644 --- a/exercises/error_handling/errors2.rs +++ b/exercises/error_handling/errors2.rs @@ -16,14 +16,15 @@ // 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 { let processing_fee = 1; let cost_per_item = 5; - let qty = item_quantity.parse::(); + let qty = match item_quantity.parse::() { + Ok(num) => num, + Err(e) => return Err(e), + }; Ok(qty * cost_per_item + processing_fee) } diff --git a/exercises/error_handling/errors3.rs b/exercises/error_handling/errors3.rs index 460ac5c4..689ee2e7 100644 --- a/exercises/error_handling/errors3.rs +++ b/exercises/error_handling/errors3.rs @@ -4,11 +4,9 @@ // 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() { +fn main() -> Result<(), ParseIntError> { let mut tokens = 100; let pretend_user_input = "8"; @@ -20,6 +18,8 @@ fn main() { tokens -= cost; println!("You now have {} tokens.", tokens); } + + Ok(()) } pub fn total_cost(item_quantity: &str) -> Result { diff --git a/exercises/error_handling/errors4.rs b/exercises/error_handling/errors4.rs index 0685c374..6db25cb4 100644 --- a/exercises/error_handling/errors4.rs +++ b/exercises/error_handling/errors4.rs @@ -1,8 +1,6 @@ // errors4.rs // Make this test pass! Execute `rustlings hint errors4` for hints :) -// I AM NOT DONE - #[derive(PartialEq, Debug)] struct PositiveNonzeroInteger(u64); @@ -14,7 +12,11 @@ enum CreationError { impl PositiveNonzeroInteger { fn new(value: i64) -> Result { - Ok(PositiveNonzeroInteger(value as u64)) + match value { + 1.. => Ok(PositiveNonzeroInteger(value as u64)), + 0 => Err(CreationError::Zero), + _ => Err(CreationError::Negative), + } } } diff --git a/exercises/error_handling/errors5.rs b/exercises/error_handling/errors5.rs index 365a8691..66889a33 100644 --- a/exercises/error_handling/errors5.rs +++ b/exercises/error_handling/errors5.rs @@ -4,14 +4,12 @@ // It won't compile right now! Why? // Execute `rustlings hint errors5` for hints! -// 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<(), ParseIntError> { +fn main() -> Result<(), Box> { let pretend_user_input = "42"; let x: i64 = pretend_user_input.parse()?; println!("output={:?}", PositiveNonzeroInteger::new(x)?); diff --git a/exercises/error_handling/errors6.rs b/exercises/error_handling/errors6.rs index 847a049a..05967282 100644 --- a/exercises/error_handling/errors6.rs +++ b/exercises/error_handling/errors6.rs @@ -8,8 +8,6 @@ // Make these tests pass! Execute `rustlings hint errors6` for hints :) -// I AM NOT DONE - use std::num::ParseIntError; // This is a custom error type that we will be using in `parse_pos_nonzero()`. @@ -20,7 +18,13 @@ enum ParsePosNonzeroError { } impl ParsePosNonzeroError { - // TODO: add another error conversion function here. + fn from_creation(err: CreationError) -> ParsePosNonzeroError { + ParsePosNonzeroError::Creation(err) + } + + fn from_parse_int(err: ParseIntError) -> ParsePosNonzeroError { + ParsePosNonzeroError::ParseInt(err) + } } fn parse_pos_nonzero(s: &str) @@ -28,7 +32,7 @@ fn parse_pos_nonzero(s: &str) { // TODO: change this to return an appropriate error instead of panicking // when `parse()` returns an error. - let x: i64 = s.parse().unwrap(); + let x: i64 = s.parse().map_err(ParsePosNonzeroError::from_parse_int)?; PositiveNonzeroInteger::new(x) .map_err(ParsePosNonzeroError::from_creation) } diff --git a/exercises/functions/functions1.rs b/exercises/functions/functions1.rs index 31125278..2358aa0f 100644 --- a/exercises/functions/functions1.rs +++ b/exercises/functions/functions1.rs @@ -1,7 +1,8 @@ // 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 5721a172..cfc3cc1a 100644 --- a/exercises/functions/functions2.rs +++ b/exercises/functions/functions2.rs @@ -1,13 +1,11 @@ // 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: i32) { for i in 0..num { println!("Ring! Call number {}", i + 1); } diff --git a/exercises/functions/functions3.rs b/exercises/functions/functions3.rs index ed5f839f..800ec1d8 100644 --- a/exercises/functions/functions3.rs +++ b/exercises/functions/functions3.rs @@ -1,10 +1,8 @@ // functions3.rs // Make me compile! Execute `rustlings hint functions3` for hints :) -// I AM NOT DONE - fn main() { - call_me(); + call_me(3); } fn call_me(num: u32) { diff --git a/exercises/functions/functions4.rs b/exercises/functions/functions4.rs index 58637e4c..b6af7c4b 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 d22aa6c8..059e9295 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 f93e64a0..59432e08 100644 --- a/exercises/generics/generics1.rs +++ b/exercises/generics/generics1.rs @@ -3,9 +3,7 @@ // Execute `rustlings hint generics1` for hints! -// 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 1501529c..8c6a5100 100644 --- a/exercises/generics/generics2.rs +++ b/exercises/generics/generics2.rs @@ -3,14 +3,12 @@ // Execute `rustlings hint generics2` for hints! -// I AM NOT DONE - -struct Wrapper { - value: u32, +struct Wrapper { + value: T, } -impl Wrapper { - pub fn new(value: u32) -> Self { +impl Wrapper { + pub fn new(value: T) -> Self { Wrapper { value } } } diff --git a/exercises/generics/generics3.rs b/exercises/generics/generics3.rs index 64dd9bc1..21dd9324 100644 --- a/exercises/generics/generics3.rs +++ b/exercises/generics/generics3.rs @@ -10,15 +10,13 @@ // Execute 'rustlings hint generics3' for hints! -// I AM NOT DONE - -pub struct ReportCard { - pub grade: f32, +pub struct ReportCard { + pub grade: T, pub student_name: String, pub student_age: u8, } -impl ReportCard { +impl ReportCard { pub fn print(&self) -> String { format!("{} ({}) - achieved a grade of {}", &self.student_name, &self.student_age, &self.grade) @@ -46,7 +44,7 @@ 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 90867545..1fe2b36a 100644 --- a/exercises/if/if1.rs +++ b/exercises/if/if1.rs @@ -1,13 +1,17 @@ // 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 + + 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 80effbdf..545083a3 100644 --- a/exercises/if/if2.rs +++ b/exercises/if/if2.rs @@ -4,13 +4,13 @@ // 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 if fizzish == "fuzz" { + "bar" } else { - 1 + "baz" } } diff --git a/exercises/intro/intro1.rs b/exercises/intro/intro1.rs index 1c4582de..3b11d4a2 100644 --- a/exercises/intro/intro1.rs +++ b/exercises/intro/intro1.rs @@ -5,8 +5,6 @@ // ready for the next exercise, remove the `I AM NOT DONE` comment below. // Execute the command `rustlings hint intro1` for a hint. -// I AM NOT DONE - fn main() { println!("Hello and"); println!(r#" welcome to... "#); diff --git a/exercises/intro/intro2.rs b/exercises/intro/intro2.rs index 97a073f0..e03edbad 100644 --- a/exercises/intro/intro2.rs +++ b/exercises/intro/intro2.rs @@ -2,8 +2,6 @@ // Make the code print a greeting to the world. // Execute `rustlings hint intro2` for a hint. -// I AM NOT DONE - fn main() { - println!("Hello {}!"); + println!("Hello {}!", "World"); } diff --git a/exercises/macros/macros1.rs b/exercises/macros/macros1.rs index ed0dac85..de2584a5 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 d0be1236..52cbfd82 100644 --- a/exercises/macros/macros2.rs +++ b/exercises/macros/macros2.rs @@ -1,14 +1,13 @@ // 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 93a43113..9caa0df7 100644 --- a/exercises/macros/macros3.rs +++ b/exercises/macros/macros3.rs @@ -2,9 +2,8 @@ // Make me compile, without taking the macro out of the module! // Execute `rustlings hint macros3` for hints :) -// I AM NOT DONE - mod macros { + #[macro_export] macro_rules! my_macro { () => { println!("Check out my macro!"); diff --git a/exercises/macros/macros4.rs b/exercises/macros/macros4.rs index 3a748078..5608ecc6 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 1a2bd0dd..3535a36a 100644 --- a/exercises/modules/modules1.rs +++ b/exercises/modules/modules1.rs @@ -1,15 +1,13 @@ // modules1.rs // Make me compile! Execute `rustlings hint modules1` for hints :) -// 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!"); } diff --git a/exercises/modules/modules2.rs b/exercises/modules/modules2.rs index 87f0c458..6680a057 100644 --- a/exercises/modules/modules2.rs +++ b/exercises/modules/modules2.rs @@ -3,13 +3,12 @@ // 'use' and 'as' keywords. Fix these 'use' statements to make the code compile. // Make me compile! Execute `rustlings hint modules2` for hints :) -// 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"; diff --git a/exercises/modules/modules3.rs b/exercises/modules/modules3.rs index 8eed77df..9a38ceed 100644 --- a/exercises/modules/modules3.rs +++ b/exercises/modules/modules3.rs @@ -5,10 +5,8 @@ // from the std::time module. Bonus style points if you can do it with one line! // Make me compile! Execute `rustlings hint modules3` for hints :) -// 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) { diff --git a/exercises/move_semantics/move_semantics1.rs b/exercises/move_semantics/move_semantics1.rs index e2f5876d..a95f851a 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 888dc529..bb4b1e1d 100644 --- a/exercises/move_semantics/move_semantics2.rs +++ b/exercises/move_semantics/move_semantics2.rs @@ -2,12 +2,9 @@ // Make me compile without changing line 13 or moving line 10! // 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); @@ -17,12 +14,13 @@ fn main() { println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1); } -fn fill_vec(vec: Vec) -> Vec { - let mut vec = vec; +fn fill_vec(vec: & Vec) -> Vec { + + let mut vec = vec.to_vec(); vec.push(22); vec.push(44); vec.push(66); - + vec } diff --git a/exercises/move_semantics/move_semantics3.rs b/exercises/move_semantics/move_semantics3.rs index 43fef74f..8be23e5e 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) -> Vec { +fn fill_vec(mut vec: Vec) -> Vec { 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 2a23c710..75d5fa61 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 takes `vec: Vec` as argument fn fill_vec() -> Vec { - let mut vec = vec; + let mut vec = Vec::new(); vec.push(22); vec.push(44); diff --git a/exercises/move_semantics/move_semantics5.rs b/exercises/move_semantics/move_semantics5.rs index c4704f9e..d9da5ffc 100644 --- a/exercises/move_semantics/move_semantics5.rs +++ b/exercises/move_semantics/move_semantics5.rs @@ -3,13 +3,11 @@ // adding, changing or removing any of them. // Execute `rustlings hint move_semantics5` for hints :) -// 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); } diff --git a/exercises/move_semantics/move_semantics6.rs b/exercises/move_semantics/move_semantics6.rs index 457e7ae7..94e30057 100644 --- a/exercises/move_semantics/move_semantics6.rs +++ b/exercises/move_semantics/move_semantics6.rs @@ -2,24 +2,22 @@ // Make me compile! `rustlings hint move_semantics6` for hints // 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); } // 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(); + let data = &data.to_uppercase(); println!("{}", data); } diff --git a/exercises/option/option1.rs b/exercises/option/option1.rs index 17cf4f60..ff9aff79 100644 --- a/exercises/option/option1.rs +++ b/exercises/option/option1.rs @@ -1,23 +1,21 @@ // option1.rs // Make me compile! Execute `rustlings hint option1` for hints -// I AM NOT DONE - // you can modify anything EXCEPT for this function's signature fn print_number(maybe_number: Option) { 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; 5]; + let mut numbers: [Option; 5] = [None; 5]; for iter in 0..5 { 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 c6b83ece..86656f6e 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_word = Some(String::from("rustlings")); // TODO: Make this an if let statement whose value is "Some" type - word = optional_word { + if let Some(word) = optional_word { println!("The word is: {}", word); } else { println!("The optional word doesn't contain anything"); @@ -19,7 +17,7 @@ fn main() { // TODO: make this a while let statement - remember that vector.pop also adds another layer of Option // You can stack `Option`'s into while let and if let - integer = optional_integers_vec.pop() { + while let Some(Some(integer)) = optional_integers_vec.pop() { println!("current value: {}", integer); } } diff --git a/exercises/option/option3.rs b/exercises/option/option3.rs index 045d2acb..8fe4cfe6 100644 --- a/exercises/option/option3.rs +++ b/exercises/option/option3.rs @@ -1,8 +1,6 @@ // option3.rs // Make me compile! Execute `rustlings hint option3` for hints -// I AM NOT DONE - struct Point { x: i32, y: i32, @@ -11,7 +9,7 @@ struct Point { fn main() { let y: Option = Some(Point { x: 100, y: 200 }); - match y { + match &y { Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y), _ => println!("no match"), } diff --git a/exercises/primitive_types/primitive_types1.rs b/exercises/primitive_types/primitive_types1.rs index 09121392..91734c69 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`) @@ -12,7 +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!"); } diff --git a/exercises/primitive_types/primitive_types2.rs b/exercises/primitive_types/primitive_types2.rs index 6576a4d5..2d32dc01 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`) @@ -16,7 +14,7 @@ fn main() { println!("Neither alphabetic nor numeric!"); } - let // Finish this line like the example! What's your favorite character? + let your_character = '9'; // 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() { diff --git a/exercises/primitive_types/primitive_types3.rs b/exercises/primitive_types/primitive_types3.rs index aaa518be..03200121 100644 --- a/exercises/primitive_types/primitive_types3.rs +++ b/exercises/primitive_types/primitive_types3.rs @@ -2,13 +2,11 @@ // 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 a = [0; 100]; + if a.len() >= 100 { - println!("Wow, that's a big array!"); + println!("Wow, that's a big array! {}", a.len()); } else { println!("Meh, I eat arrays like that for breakfast."); } diff --git a/exercises/primitive_types/primitive_types4.rs b/exercises/primitive_types/primitive_types4.rs index 10b553e9..d773c137 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 680d8d23..85f42cfc 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 b8c9b82b..0c877aa6 100644 --- a/exercises/primitive_types/primitive_types6.rs +++ b/exercises/primitive_types/primitive_types6.rs @@ -3,13 +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!") diff --git a/exercises/quiz1.rs b/exercises/quiz1.rs index 7bd3f589..0aec2c9c 100644 --- a/exercises/quiz1.rs +++ b/exercises/quiz1.rs @@ -8,10 +8,14 @@ // more than 40 at once, each apple only costs 1! 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_apple_price { +fn calculate_apple_price(apples: i32) -> i32 { + if apples > 40 { + apples * 1 + } else { + apples * 2 + } +} // Don't modify this function! #[test] diff --git a/exercises/quiz2.rs b/exercises/quiz2.rs index de0dce95..613c1d92 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_slice("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 fae0eedb..913197fd 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 } @@ -19,12 +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 replace unimplemented!() with an assert for `times_two(-4)` - unimplemented!() + assert_eq!(times_two(-4), -8); } } diff --git a/exercises/quiz4.rs b/exercises/quiz4.rs index 6c47480d..25eed172 100644 --- a/exercises/quiz4.rs +++ b/exercises/quiz4.rs @@ -5,7 +5,14 @@ // Write a macro that passes the quiz! No hints this time, you can do it! -// I AM NOT DONE +mod macros { + #[macro_export] + 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 f60061e7..79e043bc 100644 --- a/exercises/standard_library_types/arc1.rs +++ b/exercises/standard_library_types/arc1.rs @@ -18,19 +18,17 @@ // where the second TODO comment is. Try not to create any copies of the `numbers` Vec! // Execute `rustlings hint arc1` for hints :) -// I AM NOT DONE - #![forbid(unused_imports)] // Do not change this, (or the next) line. use std::sync::Arc; use std::thread; fn main() { let numbers: Vec<_> = (0..100u32).collect(); - let shared_numbers = // TODO + let shared_numbers = Arc::new(numbers); let mut joinhandles = Vec::new(); for offset in 0..8 { - let child_numbers = // TODO + let child_numbers = Arc::clone(&shared_numbers); joinhandles.push(thread::spawn(move || { let sum: u32 = child_numbers.iter().filter(|n| *n % 8 == offset).sum(); println!("Sum of offset {} is {}", offset, sum); diff --git a/exercises/standard_library_types/box1.rs b/exercises/standard_library_types/box1.rs index f312f3d6..b62a5810 100644 --- a/exercises/standard_library_types/box1.rs +++ b/exercises/standard_library_types/box1.rs @@ -16,11 +16,9 @@ // // Execute `rustlings hint box1` for hints :) -// I AM NOT DONE - #[derive(PartialEq, Debug)] pub enum List { - Cons(i32, List), + Cons(i32, Box), Nil, } @@ -33,11 +31,11 @@ fn main() { } pub fn create_empty_list() -> List { - unimplemented!() + List::Nil } pub fn create_non_empty_list() -> List { - unimplemented!() + List::Cons(10, Box::new(List::Cons(20, Box::new(List::Nil)))) } #[cfg(test)] diff --git a/exercises/standard_library_types/iterators1.rs b/exercises/standard_library_types/iterators1.rs index 5aa49b64..98cc1c80 100644 --- a/exercises/standard_library_types/iterators1.rs +++ b/exercises/standard_library_types/iterators1.rs @@ -8,17 +8,15 @@ // // Execute `rustlings hint iterators1` for hints :D -// 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 } diff --git a/exercises/standard_library_types/iterators2.rs b/exercises/standard_library_types/iterators2.rs index 87b4eaa1..4fca831e 100644 --- a/exercises/standard_library_types/iterators2.rs +++ b/exercises/standard_library_types/iterators2.rs @@ -3,8 +3,6 @@ // can offer. Follow the steps to complete the exercise. // As always, there are hints if you execute `rustlings hint iterators2`! -// I AM NOT DONE - // Step 1. // Complete the `capitalize_first` function. // "hello" -> "Hello" @@ -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().collect::() + c.as_str(), } } @@ -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 { - vec![] + words.iter().map(|w| capitalize_first(w)).collect() } // Step 3. @@ -29,7 +27,7 @@ pub fn capitalize_words_vector(words: &[&str]) -> Vec { // 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)] diff --git a/exercises/standard_library_types/iterators3.rs b/exercises/standard_library_types/iterators3.rs index 8c66c05b..5355b228 100644 --- a/exercises/standard_library_types/iterators3.rs +++ b/exercises/standard_library_types/iterators3.rs @@ -6,8 +6,6 @@ // list_of_results functions. // Execute `rustlings hint iterators3` to get some hints! -// I AM NOT DONE - #[derive(Debug, PartialEq, Eq)] pub enum DivisionError { NotDivisible(NotDivisibleError), @@ -22,20 +20,38 @@ 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 {} +pub fn divide(a: i32, b: i32) -> Result { + if b == 0 { + return Err(DivisionError::DivideByZero) + } else if a % b == 0 { + return Ok(a / b) + } else { + return 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, DivisionError> { let numbers = vec![27, 297, 38502, 81]; - let division_results = numbers.into_iter().map(|n| divide(n, 27)); + let division_results: Result, DivisionError> = numbers.into_iter().map(|n| divide(n, 27)).collect(); + division_results } // Complete the function and return a value of the correct type so the test passes. // Desired output: [Ok(1), Ok(11), Ok(1426), Ok(3)] -fn list_of_results() -> () { +fn list_of_results() -> Vec> { let numbers = vec![27, 297, 38502, 81]; - let division_results = numbers.into_iter().map(|n| divide(n, 27)); + let division_results: Vec> = numbers.into_iter().map(|n| divide(n, 27)).collect(); + division_results } #[cfg(test)] diff --git a/exercises/standard_library_types/iterators4.rs b/exercises/standard_library_types/iterators4.rs index 88862838..1ba25ac4 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: @@ -12,6 +10,7 @@ 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)] diff --git a/exercises/standard_library_types/iterators5.rs b/exercises/standard_library_types/iterators5.rs index 93f3ae11..5b7a3555 100644 --- a/exercises/standard_library_types/iterators5.rs +++ b/exercises/standard_library_types/iterators5.rs @@ -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)] @@ -34,6 +32,8 @@ fn count_for(map: &HashMap, value: Progress) -> usize { fn count_iterator(map: &HashMap, value: Progress) -> usize { // map is a hashmap with String keys and Progress values. // map = { "variables1": Complete, "from_str": None, ... } + + map.values().filter(|&x| x == &value).count() } fn count_collection_for(collection: &[HashMap], value: Progress) -> usize { @@ -52,6 +52,13 @@ fn count_collection_iterator(collection: &[HashMap], value: Pr // collection is a slice of hashmaps. // collection = [{ "variables1": Complete, "from_str": None, ... }, // { "variables2": Complete, ... }, ... ] + + let mut count = 0; + + for map in collection { + count += map.values().filter(|&x| x == &value).count(); + } + count } #[cfg(test)] diff --git a/exercises/strings/strings1.rs b/exercises/strings/strings1.rs index 80902444..21a0139b 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 5a2ce74a..a048f882 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 6d0b2f49..268a4beb 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 +18,7 @@ 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 +27,7 @@ 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 +36,9 @@ 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 f9c6427d..00665ffb 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 +32,17 @@ 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"), + year: 2019, + made_by_phone: false, + made_by_mobile: false, + made_by_email: true, + item_number: 123, + count: 1, + }; + 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 e84f2ebc..f61d35d3 100644 --- a/exercises/structs/structs3.rs +++ b/exercises/structs/structs3.rs @@ -4,8 +4,6 @@ // 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, @@ -16,7 +14,7 @@ struct Package { impl Package { fn new(sender_country: String, recipient_country: String, weight_in_grams: i32) -> Package { if weight_in_grams <= 0 { - // panic statement goes here... + panic!("weight in grams can not be less than zero"); } else { Package { sender_country, @@ -26,12 +24,12 @@ impl Package { } } - fn is_international(&self) -> ??? { - // Something goes here... + fn is_international(&self) -> bool { + self.sender_country != self.recipient_country } - fn get_fees(&self, cents_per_gram: i32) -> ??? { - // Something goes here... + fn get_fees(&self, cents_per_gram: i32) -> i32 { + cents_per_gram * self.weight_in_grams } } diff --git a/exercises/tests/tests1.rs b/exercises/tests/tests1.rs index 50586a19..005731fd 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 0d981ad1..658055e1 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!(true, true); } } diff --git a/exercises/tests/tests3.rs b/exercises/tests/tests3.rs index 3424f940..81eae9e3 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(4)); } #[test] fn is_false_when_odd() { - assert!(); + assert!(!is_even(3)); } } diff --git a/exercises/threads/threads1.rs b/exercises/threads/threads1.rs index f31b317e..c4744eff 100644 --- a/exercises/threads/threads1.rs +++ b/exercises/threads/threads1.rs @@ -6,9 +6,7 @@ // of "waiting..." and the program ends without timing out when running, // you've got it :) -// I AM NOT DONE - -use std::sync::Arc; +use std::sync::{Arc, Mutex}; use std::thread; use std::time::Duration; @@ -17,15 +15,16 @@ struct JobStatus { } fn main() { - let status = Arc::new(JobStatus { jobs_completed: 0 }); + let status = Arc::new(Mutex::new(JobStatus { jobs_completed: 0 })); let status_shared = status.clone(); thread::spawn(move || { for _ in 0..10 { thread::sleep(Duration::from_millis(250)); - status_shared.jobs_completed += 1; + status_shared.lock().unwrap().jobs_completed += 1; } }); - while status.jobs_completed < 10 { + + while status.lock().unwrap().jobs_completed < 10 { println!("waiting... "); thread::sleep(Duration::from_millis(500)); } diff --git a/exercises/traits/traits1.rs b/exercises/traits/traits1.rs index 15e08f24..9513d659 100644 --- a/exercises/traits/traits1.rs +++ b/exercises/traits/traits1.rs @@ -8,14 +8,15 @@ // 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() { diff --git a/exercises/traits/traits2.rs b/exercises/traits/traits2.rs index 916c3c4b..67af43f0 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 { + 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 d1af8311..f41da792 100644 --- a/exercises/variables/variables1.rs +++ b/exercises/variables/variables1.rs @@ -2,9 +2,7 @@ // Make me compile! // Execute the command `rustlings hint variables1` if you want a hint :) -// I AM NOT DONE - fn main() { - x = 5; + let x = 5; println!("x has the value {}", x); } diff --git a/exercises/variables/variables2.rs b/exercises/variables/variables2.rs index 7774a8fb..2119027a 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: i32 = 10; if x == 10 { println!("Ten!"); } else { diff --git a/exercises/variables/variables3.rs b/exercises/variables/variables3.rs index 30ec48ff..7d84709d 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 77f1e9ab..62fb1c2a 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 = 10; println!("Number {}", x); } diff --git a/exercises/variables/variables5.rs b/exercises/variables/variables5.rs index 175eebb3..e31ab3f2 100644 --- a/exercises/variables/variables5.rs +++ b/exercises/variables/variables5.rs @@ -1,11 +1,9 @@ // 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"; // don't change this line println!("Spell a Number : {}", number); - number = 3; + let number = 3; println!("Number plus two is : {}", number + 2); } diff --git a/exercises/variables/variables6.rs b/exercises/variables/variables6.rs index 98666914..2ad47aac 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); }