d2

Author: vedant-asati

.rustlings-state.txt

@@ -1,6 +1,6 @@
 DON'T EDIT THIS FILE!
 
-move_semantics5
+errors4
 
 intro1
 intro2
@@ -30,4 +30,28 @@ vecs2
 move_semantics1
 move_semantics2
 move_semantics3
-move_semantics4
+move_semantics4
+move_semantics5
+structs1
+structs2
+structs3
+enums1
+enums2
+enums3
+strings1
+strings2
+strings3
+strings4
+modules1
+modules2
+modules3
+hashmaps1
+hashmaps2
+hashmaps3
+quiz2
+options1
+options2
+options3
+errors1
+errors2
+errors3

exercises/07_structs/structs1.rs

@@ -1,9 +1,13 @@
 struct ColorRegularStruct {
     // TODO: Add the fields that the test `regular_structs` expects.
     // What types should the fields have? What are the minimum and maximum values for RGB colors?
+    red: u64,
+    green: u64,
+    blue: u64,
 }
 
-struct ColorTupleStruct(/* TODO: Add the fields that the test `tuple_structs` expects */);
+// struct ColorTupleStruct(/* TODO: Add the fields that the test `tuple_structs` expects */);
+struct ColorTupleStruct(i32, i32, i32);
 
 #[derive(Debug)]
 struct UnitStruct;
@@ -19,7 +23,11 @@ mod tests {
     #[test]
     fn regular_structs() {
         // TODO: Instantiate a regular struct.
-        // let green =
+        let green = ColorRegularStruct {
+            red: 0,
+            green: 255,
+            blue: 0,
+        };
 
         assert_eq!(green.red, 0);
         assert_eq!(green.green, 255);
@@ -29,7 +37,7 @@ 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);
@@ -39,7 +47,7 @@ mod tests {
     #[test]
     fn unit_structs() {
         // TODO: Instantiate a unit struct.
-        // let unit_struct =
+        let unit_struct = UnitStruct;
         let message = format!("{unit_struct:?}s are fun!");
 
         assert_eq!(message, "UnitStructs are fun!");

exercises/07_structs/structs2.rs

@@ -34,7 +34,11 @@ mod tests {
         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);

exercises/07_structs/structs3.rs

@@ -24,14 +24,16 @@ impl Package {
     }
 
     // TODO: Add the correct return type to the function signature.
-    fn is_international(&self) {
+    fn is_international(&self) -> bool {
         // TODO: Read the tests that use this method to find out when a package
         // is considered international.
+        self.recipient_country != self.sender_country
     }
 
     // TODO: Add the correct return type to the function signature.
-    fn get_fees(&self, cents_per_gram: u32) {
+    fn get_fees(&self, cents_per_gram: u32) -> u32 {
         // TODO: Calculate the package's fees.
+        self.weight_in_grams * cents_per_gram
     }
 }
 

exercises/08_enums/enums1.rs

@@ -1,6 +1,11 @@
 #[derive(Debug)]
 enum Message {
     // TODO: Define a few types of messages as used below.
+    Resize,
+    Move,
+    Echo,
+    ChangeColor,
+    Quit
 }
 
 fn main() {

exercises/08_enums/enums2.rs

@@ -7,6 +7,11 @@ struct Point {
 #[derive(Debug)]
 enum Message {
     // TODO: Define the different variants used below.
+    Resize { width: u32, height: u32 },
+    Move(Point),
+    Echo(String),
+    ChangeColor(u8, u8, u8),
+    Quit,
 }
 
 impl Message {

exercises/08_enums/enums3.rs

@@ -46,6 +46,14 @@ impl State {
     fn process(&mut self, message: Message) {
         // TODO: Create a match expression to process the different message
         // variants using the methods defined above.
+        match message {
+            Message::Resize { width, height } => self.resize(width, height),
+            Message::Move(p) => self.move_position(p),
+            Message::Echo(msg) => self.echo(msg),
+            Message::ChangeColor(r, g, b) => self.change_color(r, g, b),
+            Message::Quit => self.quit(),
+            _ => println!("JSR"),
+        }
     }
 }
 

exercises/09_strings/strings1.rs

@@ -1,6 +1,6 @@
 // TODO: Fix the compiler error without changing the function signature.
 fn current_favorite_color() -> String {
-    "blue"
+    String::from("blue")
 }
 
 fn main() {

exercises/09_strings/strings2.rs

@@ -6,7 +6,7 @@ fn is_a_color_word(attempt: &str) -> bool {
 fn main() {
     let word = String::from("green"); // Don't change 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.");

exercises/09_strings/strings3.rs

@@ -1,13 +1,16 @@
 fn trim_me(input: &str) -> &str {
     // TODO: Remove whitespace from both ends of a string.
+    input.trim()
 }
 
 fn compose_me(input: &str) -> String {
     // TODO: Add " world!" to the string! There are multiple ways to do this.
+    String::from(input) + " world!"
 }
 
 fn replace_me(input: &str) -> String {
     // TODO: Replace "cars" in the string with "balloons".
+    input.replace("cars", "balloons")
 }
 
 fn main() {

exercises/09_strings/strings4.rs

@@ -13,25 +13,25 @@ fn string(arg: String) {
 // Your task is to replace `placeholder(…)` with either `string_slice(…)`
 // or `string(…)` depending on what you think each value is.
 fn main() {
-    placeholder("blue");
+    string_slice("blue");
 
-    placeholder("red".to_string());
+    string("red".to_string());
 
-    placeholder(String::from("hi"));
+    string(String::from("hi"));
 
-    placeholder("rust is fun!".to_owned());
+    string("rust is fun!".to_owned());
 
-    placeholder("nice weather".into());
+    string_slice("nice weather".into());
 
-    placeholder(format!("Interpolation {}", "Station"));
+    string(format!("Interpolation {}", "Station"));
 
     // WARNING: This is byte indexing, not character indexing.
     // Character indexing can be done using `s.chars().nth(INDEX)`.
-    placeholder(&String::from("abc")[0..1]);
+    string_slice(&String::from("abc")[0..1]);
 
-    placeholder("  hello there ".trim());
+    string_slice("  hello there ".trim());
 
-    placeholder("Happy Monday!".replace("Mon", "Tues"));
+    string("Happy Monday!".replace("Mon", "Tues"));
 
-    placeholder("mY sHiFt KeY iS sTiCkY".to_lowercase());
+    string("mY sHiFt KeY iS sTiCkY".to_lowercase());
 }

exercises/10_modules/modules1.rs

@@ -5,7 +5,7 @@ mod sausage_factory {
         String::from("Ginger")
     }
 
-    fn make_sausage() {
+    pub fn make_sausage() {
         get_secret_recipe();
         println!("sausage!");
     }

exercises/10_modules/modules2.rs

@@ -3,8 +3,8 @@
 
 mod delicious_snacks {
     // TODO: Add the following two `use` statements after fixing them.
-    // 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: &str = "Pear";

exercises/10_modules/modules3.rs

@@ -3,7 +3,8 @@
 
 // TODO: Bring `SystemTime` and `UNIX_EPOCH` from the `std::time` module into
 // your scope. Bonus style points if you can do it with one line!
-// use ???;
+use std::time::SystemTime;
+use std::time::UNIX_EPOCH;
 
 fn main() {
     match SystemTime::now().duration_since(UNIX_EPOCH) {

exercises/11_hashmaps/hashmaps1.rs

@@ -8,13 +8,16 @@ use std::collections::HashMap;
 
 fn fruit_basket() -> HashMap<String, u32> {
     // TODO: Declare the hash map.
-    // let mut basket =
+    let mut basket: HashMap<String, u32> = HashMap::new();
 
     // Two bananas are already given for you :)
     basket.insert(String::from("banana"), 2);
 
     // TODO: Put more fruits in your basket.
 
+    basket.insert(String::from("apple"), 2);
+    basket.insert(String::from("mango"), 1);
+
     basket
 }
 

exercises/11_hashmaps/hashmaps2.rs

@@ -32,6 +32,7 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
         // TODO: Insert new fruits if they are not already present in the
         // basket. Note that you are not allowed to put any type of fruit that's
         // already present!
+        basket.entry(fruit).or_insert(4);
     }
 }
 

exercises/11_hashmaps/hashmaps3.rs

@@ -31,6 +31,27 @@ fn build_scores_table(results: &str) -> HashMap<&str, TeamScores> {
         // Keep in mind that goals scored by team 1 will be the number of goals
         // conceded by team 2. Similarly, goals scored by team 2 will be the
         // number of goals conceded by team 1.
+
+        scores
+            .entry(team_1_name)
+            .and_modify(|e| {
+                e.goals_conceded += team_2_score;
+                e.goals_scored += team_1_score;
+            })
+            .or_insert(TeamScores {
+                goals_scored: team_1_score,
+                goals_conceded: team_2_score,
+            });
+        scores
+            .entry(team_2_name)
+            .and_modify(|e| {
+                e.goals_conceded += team_1_score;
+                e.goals_scored += team_2_score;
+            })
+            .or_insert(TeamScores {
+                goals_scored: team_2_score,
+                goals_conceded: team_1_score,
+            });
     }
 
     scores

exercises/12_options/options1.rs

@@ -4,6 +4,13 @@
 // `hour_of_day` is higher than 23.
 fn maybe_icecream(hour_of_day: u16) -> Option<u16> {
     // TODO: Complete the function body.
+    if hour_of_day < 22 {
+        Some(5)
+    } else if hour_of_day > 23 {
+        None
+    } else {
+        Some(0)
+    }
 }
 
 fn main() {
@@ -18,8 +25,7 @@ mod tests {
     fn raw_value() {
         // TODO: Fix this test. How do you get the value contained in the
         // Option?
-        let icecreams = maybe_icecream(12);
-
+        let icecreams = maybe_icecream(12).unwrap();
         assert_eq!(icecreams, 5); // Don't change this line.
     }
 

exercises/12_options/options2.rs

@@ -10,7 +10,10 @@ mod tests {
         let optional_target = Some(target);
 
         // TODO: Make this an if-let statement whose value is `Some`.
-        word = optional_target {
+        // word = optional_target {
+        //     assert_eq!(word, target);
+        // }
+        if let Some(word) = optional_target {
             assert_eq!(word, target);
         }
     }
@@ -29,8 +32,9 @@ mod tests {
         // TODO: Make this a while-let statement. Remember that `Vec::pop()`
         // adds another layer of `Option`. You can do nested pattern matching
         // in if-let and while-let statements.
-        integer = optional_integers.pop() {
+        while let Some(Some(integer)) = optional_integers.pop() {
             assert_eq!(integer, cursor);
+            println!("JSR");
             cursor -= 1;
         }
 

exercises/12_options/options3.rs

@@ -9,7 +9,7 @@ fn main() {
 
     // TODO: Fix the compiler error by adding something to this match statement.
     match optional_point {
-        Some(p) => println!("Co-ordinates are {},{}", p.x, p.y),
+        Some(ref p) => println!("Co-ordinates are {},{}", p.x, p.y),
         _ => panic!("No match!"),
     }
 

exercises/13_error_handling/errors1.rs

@@ -4,12 +4,12 @@
 // construct to `Option` that can be used to express error conditions. Change
 // the function signature and body to return `Result<String, String>` instead
 // of `Option<String>`.
-fn generate_nametag_text(name: String) -> Option<String> {
+fn generate_nametag_text(name: String) -> Result<String, String> {
     if name.is_empty() {
         // Empty names aren't allowed
-        None
+        Err("Empty names aren't allowed".to_string())
     } else {
-        Some(format!("Hi! My name is {name}"))
+        Ok(format!("Hi! My name is {name}"))
     }
 }