exercises/11_hashmaps/hashmaps1.rs

@@ -1,19 +1,20 @@
 // A basket of fruits in the form of a hash map needs to be defined. The key
 // represents the name of the fruit and the value represents how many of that
-// particular fruit is in the basket. You have to put at least 3 different
+// particular fruit is in the basket. You have to put at least three different
 // types of fruits (e.g apple, banana, mango) in the basket and the total count
-// of all the fruits should be at least 5.
+// of all the fruits should be at least five.
+//
+// Make me compile and pass the tests!
 
 use std::collections::HashMap;
 
 fn fruit_basket() -> HashMap<String, u32> {
-    // TODO: Declare the hash map.
+    let mut basket = // TODO: declare your hash map here.
-    // let mut basket =
 
     // Two bananas are already given for you :)
     basket.insert(String::from("banana"), 2);
 
-    // TODO: Put more fruits in your basket.
+    // TODO: Put more fruits in your basket here.
 
     basket
 }

exercises/11_hashmaps/hashmaps2.rs

@@ -6,10 +6,12 @@
 // must add fruit to the basket so that there is at least one of each kind and
 // more than 11 in total - we have a lot of mouths to feed. You are not allowed
 // to insert any more of these fruits!
+//
+// Make me pass the tests!
 
 use std::collections::HashMap;
 
-#[derive(Hash, PartialEq, Eq, Debug)]
+#[derive(Hash, PartialEq, Eq)]
 enum Fruit {
     Apple,
     Banana,
@@ -19,7 +21,7 @@ enum Fruit {
 }
 
 fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
-    let fruit_kinds = [
+    let fruit_kinds = vec![
         Fruit::Apple,
         Fruit::Banana,
         Fruit::Mango,
@@ -44,8 +46,12 @@ mod tests {
 
     // Don't modify this function!
     fn get_fruit_basket() -> HashMap<Fruit, u32> {
-        let content = [(Fruit::Apple, 4), (Fruit::Mango, 2), (Fruit::Lychee, 5)];
+        let mut basket = HashMap::<Fruit, u32>::new();
-        HashMap::from_iter(content)
+        basket.insert(Fruit::Apple, 4);
+        basket.insert(Fruit::Mango, 2);
+        basket.insert(Fruit::Lychee, 5);
+
+        basket
     }
 
     #[test]
@@ -75,22 +81,10 @@ mod tests {
 
     #[test]
     fn all_fruit_types_in_basket() {
-        let fruit_kinds = [
-            Fruit::Apple,
-            Fruit::Banana,
-            Fruit::Mango,
-            Fruit::Lychee,
-            Fruit::Pineapple,
-        ];
-
         let mut basket = get_fruit_basket();
         fruit_basket(&mut basket);
-
+        for amount in basket.values() {
-        for fruit_kind in fruit_kinds {
+            assert_ne!(amount, &0);
-            let Some(amount) = basket.get(&fruit_kind) else {
-                panic!("Fruit kind {fruit_kind:?} was not found in basket");
-            };
-            assert!(*amount > 0);
         }
     }
 }

rustlings-macros/info.toml

@@ -558,17 +558,20 @@ paths to bring these two in using only one line."""
 name = "hashmaps1"
 dir = "11_hashmaps"
 hint = """
-The number of fruits should be at least 5 and you have to put at least 3
+Hint 1: Take a look at the return type of the function to figure out
-different types of fruits."""
+        the type for the `basket`.
+
+Hint 2: Number of fruits should be at least 5. And you have to put
+        at least three different types of fruits.
+"""
 
 [[exercises]]
 name = "hashmaps2"
 dir = "11_hashmaps"
 hint = """
 Use the `entry()` and `or_insert()` methods of `HashMap` to achieve this.
-
+Learn more at https://doc.rust-lang.org/stable/book/ch08-03-hash-maps.html#only-inserting-a-value-if-the-key-has-no-value
-Learn more in The Book:
+"""
-https://doc.rust-lang.org/stable/book/ch08-03-hash-maps.html#only-inserting-a-value-if-the-key-has-no-value"""
 
 [[exercises]]
 name = "hashmaps3"

solutions/11_hashmaps/hashmaps1.rs

@@ -1,42 +1 @@
-// A basket of fruits in the form of a hash map needs to be defined. The key
+// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
-// represents the name of the fruit and the value represents how many of that
-// particular fruit is in the basket. You have to put at least 3 different
-// types of fruits (e.g apple, banana, mango) in the basket and the total count
-// of all the fruits should be at least 5.
-
-use std::collections::HashMap;
-
-fn fruit_basket() -> HashMap<String, u32> {
-    // Declare the hash map.
-    let mut basket = HashMap::new();
-
-    // Two bananas are already given for you :)
-    basket.insert(String::from("banana"), 2);
-
-    // Put more fruits in your basket.
-    basket.insert(String::from("apple"), 3);
-    basket.insert(String::from("mango"), 1);
-
-    basket
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn at_least_three_types_of_fruits() {
-        let basket = fruit_basket();
-        assert!(basket.len() >= 3);
-    }
-
-    #[test]
-    fn at_least_five_fruits() {
-        let basket = fruit_basket();
-        assert!(basket.values().sum::<u32>() >= 5);
-    }
-}

solutions/11_hashmaps/hashmaps2.rs

@@ -1,95 +1 @@
-// We're collecting different fruits to bake a delicious fruit cake. For this,
+// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
-// we have a basket, which we'll represent in the form of a hash map. The key
-// represents the name of each fruit we collect and the value represents how
-// many of that particular fruit we have collected. Three types of fruits -
-// Apple (4), Mango (2) and Lychee (5) are already in the basket hash map. You
-// must add fruit to the basket so that there is at least one of each kind and
-// more than 11 in total - we have a lot of mouths to feed. You are not allowed
-// to insert any more of these fruits!
-
-use std::collections::HashMap;
-
-#[derive(Hash, PartialEq, Eq, Debug)]
-enum Fruit {
-    Apple,
-    Banana,
-    Mango,
-    Lychee,
-    Pineapple,
-}
-
-fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
-    let fruit_kinds = [
-        Fruit::Apple,
-        Fruit::Banana,
-        Fruit::Mango,
-        Fruit::Lychee,
-        Fruit::Pineapple,
-    ];
-
-    for fruit in fruit_kinds {
-        // If fruit doesn't exist, insert it with some value.
-        basket.entry(fruit).or_insert(5);
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    // Don't modify this function!
-    fn get_fruit_basket() -> HashMap<Fruit, u32> {
-        let content = [(Fruit::Apple, 4), (Fruit::Mango, 2), (Fruit::Lychee, 5)];
-        HashMap::from_iter(content)
-    }
-
-    #[test]
-    fn test_given_fruits_are_not_modified() {
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-        assert_eq!(*basket.get(&Fruit::Apple).unwrap(), 4);
-        assert_eq!(*basket.get(&Fruit::Mango).unwrap(), 2);
-        assert_eq!(*basket.get(&Fruit::Lychee).unwrap(), 5);
-    }
-
-    #[test]
-    fn at_least_five_types_of_fruits() {
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-        let count_fruit_kinds = basket.len();
-        assert!(count_fruit_kinds >= 5);
-    }
-
-    #[test]
-    fn greater_than_eleven_fruits() {
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-        let count = basket.values().sum::<u32>();
-        assert!(count > 11);
-    }
-
-    #[test]
-    fn all_fruit_types_in_basket() {
-        let fruit_kinds = [
-            Fruit::Apple,
-            Fruit::Banana,
-            Fruit::Mango,
-            Fruit::Lychee,
-            Fruit::Pineapple,
-        ];
-
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-
-        for fruit_kind in fruit_kinds {
-            let Some(amount) = basket.get(&fruit_kind) else {
-                panic!("Fruit kind {fruit_kind:?} was not found in basket");
-            };
-            assert!(*amount > 0);
-        }
-    }
-}