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| -rw-r--r-- | exercises/collections/hashmap1.rs | 46 | ||||
| -rw-r--r-- | exercises/collections/hashmap2.rs | 83 | ||||
| -rw-r--r-- | info.toml | 22 |
3 files changed, 151 insertions, 0 deletions
diff --git a/exercises/collections/hashmap1.rs b/exercises/collections/hashmap1.rs new file mode 100644 index 0000000..b1dc0bb --- /dev/null +++ b/exercises/collections/hashmap1.rs @@ -0,0 +1,46 @@ +// hashmap1.rs +// 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 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 five. +// +// Make me compile and pass the tests! +// +// Execute the command `rustlings hint collections3` if you need +// hints. + +// I AM NOT DONE + +use std::collections::HashMap; + +fn fruit_basket() -> HashMap<String, u32> { + let mut basket = // TODO: declare your hash map here. + + // Two bananas are already given for you :) + basket.insert(String::from("banana"), 2); + + // TODO: Put more fruits in your basket here. + + basket +} + +#[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); + } +} diff --git a/exercises/collections/hashmap2.rs b/exercises/collections/hashmap2.rs new file mode 100644 index 0000000..7e25be7 --- /dev/null +++ b/exercises/collections/hashmap2.rs @@ -0,0 +1,83 @@ +// hashmap2.rs + +// A basket of fruits in the form of a hash map is given. 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 *MORE +// THAN 11* fruits in the basket. Three types of fruits - Apple (4), +// Mango (2) and Lichi (5) are already given in the basket. You are +// not allowed to insert any more of these fruits! +// +// Make me pass the tests! +// +// Execute the command `rustlings hint collections4` if you need +// hints. + +// I AM NOT DONE + +use std::collections::HashMap; + +#[derive(Hash, PartialEq, Eq)] +enum Fruit { + Apple, + Banana, + Mango, + Lichi, + Pineapple, +} + +fn fruit_basket(basket: &mut HashMap<Fruit, u32>) { + let fruit_kinds = vec![ + Fruit::Apple, + Fruit::Banana, + Fruit::Mango, + Fruit::Lichi, + Fruit::Pineapple, + ]; + + 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! + } +} + +#[cfg(test)] +mod tests { + use super::*; + + fn get_fruit_basket() -> HashMap<Fruit, u32> { + let mut basket = HashMap::<Fruit, u32>::new(); + basket.insert(Fruit::Apple, 4); + basket.insert(Fruit::Mango, 2); + basket.insert(Fruit::Lichi, 5); + + basket + } + + #[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::Lichi).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); + } +} @@ -400,6 +400,28 @@ Hint 1: `i` is each element from the Vec as they are being iterated. Hint 2: Check the suggestion from the compiler error ;) """ +[[exercises]] +name = "collections3" +path = "exercises/collections/hashmap1.rs" +mode = "test" +hint = """ +Hint 1: Take a look at the return type of the function to figure out + 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 = "collections4" +path = "exercises/collections/hashmap2.rs" +mode = "test" +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 +""" + # MACROS [[exercises]] |