Associated types

Associated types in Rust allow you to define traits with a type placeholder that implementors of the trait can specify. This enables more flexible and type-safe abstractions.

For example, instead of passing types as generic parameters every time, you can use associated types to simplify the interface. Associated types are particularly useful when working with collections, iterators, or data processing pipelines.

In this challenge, you'll define a trait with an associated type and implement it for a struct. The goal is to create a structure for managing a simple Key-Value store where keys and values can have different types specified by the trait implementation.

You can solve the problem using either generics or associated types, but the challenge is made to make you familiar with associated types, so try to solve the challenge by using them intead of generics.

Your Task

Define a trait KeyValueStore with an associated type Key and Value. Implement this trait for the struct InMemoryStore. The implementation should allow storing and retrieving key-value pairs of the specified types.

Requirements

Define a trait KeyValueStore with:
- An associated type Key.
- An associated type Value.
- Methods:
  - set to add a key-value pair.
  - get takes a reference of &Key and returns Option<&Value>.
Create a struct InMemoryStore that uses a HashMap to store key-value pairs. Implement the KeyValueStore trait for this struct.
Make sure all relevant values are public so that they can be accessed from outside the module (essential to pass the tests).

Hints

If you're stuck, here are some hints to help you solve the challenge:

Click here to reveal hints

Define associated types in the KeyValueStore trait like this:

pub trait KeyValueStore {
    type Key;
    type Value;
 
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}

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Solutions

amaneru

7ma8no9

11 hours ago

6.64ms

197.70kb

// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
    fn set(&mut self, key: Self::Key, value: Self::Value);
}
use std::collections::HashMap;
use std::hash::Hash;
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, T> {
    pub storage: HashMap<K, T>
}
// 3. Implement the trait for InMemoryStore
impl <K, V>KeyValueStore for InMemoryStore<K, V>
where K: Eq + Hash {
    type Key = K;
    type Value = V;
    fn get(&self, key: &Self::Key) -> Option<&V> {
        self.storage.get(key)
    }
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

AKA.MoneyTaker

M4Bo2

2 days ago

6.48ms

197.70kb

// 1. Finish the trait definition Define a trait KeyValueStore with an associated type Key and Value. Implement this trait for the struct InMemoryStore. The implementation should allow storing and retrieving key-value pairs of the specified types.
// Requirements
// Define a trait KeyValueStore with:
// An associated type Key.
// An associated type Value.
// Methods:
// set to add a key-value pair.
// get takes a reference of &Key and returns Option<&Value>.
// Create a struct InMemoryStore that uses a HashMap to store key-value pairs. Implement the KeyValueStore trait for this struct.
// Make sure all relevant values are public so that they can be accessed from outside the module (essential to pass the tests)
use std::collections::HashMap;
// Define the KeyValueStore trait
pub trait KeyValueStore {
    type Key;
    type Value;
    // Method to set a key-value pair
    fn set(&mut self, key: Self::Key, value: Self::Value);
    // Method to get a value by key
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// Define the InMemoryStore struct
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// Implement the KeyValueStore trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where
    K: std::cmp::Eq + std::hash::Hash, // Required for HashMap keys
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Muhammad-Dennis

2 days ago

6.04ms

197.70kb

use std::{collections::HashMap, hash::Hash};
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>
}
// 3. Implement the trait for InMemoryStore
impl <K,V>KeyValueStore for InMemoryStore<K, V> 
where
    K: Hash + Eq
{
    type Key = K;
    type Value = V;
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Kentaro Abe

abekem

3 days ago

6.42ms

197.70kb

use std::collections::HashMap;
pub trait KeyValueStore {
    type Key;
    type Value;
    
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where
    K: std::cmp::Eq + std::hash::Hash,
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Guilherme Cesário Strachan

strachan

3 days ago

6.00ms

197.70kb

use std::collections::HashMap;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<T, V> {
    pub storage: HashMap<T, V>,
}
// 3. Implement the trait for InMemoryStore
impl<T, V> KeyValueStore for InMemoryStore<T, V>
where
    T: std::cmp::Eq + std::hash::Hash,
{
    type Key = T;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

AKA.MoneyTaker

M4Bo2

3 days ago

8.14ms

197.70kb

// 1. Finish the trait definition Define a trait KeyValueStore with an associated type Key and Value. Implement this trait for the struct InMemoryStore. The implementation should allow storing and retrieving key-value pairs of the specified types.
// Requirements
// Define a trait KeyValueStore with:
// An associated type Key.
// An associated type Value.
// Methods:
// set to add a key-value pair.
// get takes a reference of &Key and returns Option<&Value>.
// Create a struct InMemoryStore that uses a HashMap to store key-value pairs. Implement the KeyValueStore trait for this struct.
// Make sure all relevant values are public so that they can be accessed from outside the module (essential to pass the tests)
use std::collections::HashMap;
// Define the KeyValueStore trait
pub trait KeyValueStore {
    type Key;
    type Value;
    // Method to set a key-value pair
    fn set(&mut self, key: Self::Key, value: Self::Value);
    // Method to get a value by key
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// Define the InMemoryStore struct
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// Implement the KeyValueStore trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where
    K: std::cmp::Eq + std::hash::Hash, // Required for HashMap keys
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Anıl Şenay

anilsenay

5 days ago

6.88ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K: Hash + Eq, V> KeyValueStore for InMemoryStore<K, V> {
    type Key = K;
    type Value = V;
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Dyaa Adel

dyaa-adel

6 days ago

7.88ms

197.70kb

use std::collections::HashMap;
use core::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
 
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage : HashMap<K, V>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where K: Eq + Hash {
    type Key = K;
    type Value = V;
    fn set(&mut self, key : Self::Key, value: Self::Value) {
        self.storage.insert(key ,value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

manuelmj

8 days ago

6.50ms

197.70kb

use std::collections::HashMap;
 use core::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore{
    type Key; 
    type Value;
    // fn set(&mut self, key: self::Key, value: self::Value);
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key)-> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K,V>{
    pub storage: HashMap<K,V>
}
// 3. Implement the trait for InMemoryStore
impl<K,V> KeyValueStore for InMemoryStore<K,V>
where K: Eq + Hash{
    type Key = K; 
    type Value = V; 
    fn set(&mut self, key: Self::Key, value: Self::Value){
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key)-> Option<&Self::Value>{
        self.storage.get(key) 
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

norabbito

8 days ago

6.41ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K: Hash + Eq, V> KeyValueStore for InMemoryStore<K, V> {
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Ayushman Rathore

Spartan09

9 days ago

5.78ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where K: Eq + Hash
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Romain Grimau

Herrgrim0

9 days ago

6.40ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, _:Self::Key, _:Self::Value);
    fn get(&self, _:&Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>,
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> where K: Eq + Hash {
    type Key = K;
    type Value = V;
    fn set(&mut self, k:K, v:V) {
        self.storage.insert(k, v);
    }
    fn get(&self, k: &K) -> Option<&V> {
        self.storage.get(k)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Jun Huang

leemars

10 days ago

6.18ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where K: Eq + Hash
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Jordan

Jordan-Haidee

12 days ago

7.26ms

197.70kb

// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key; 
    type Value; 
    fn set(&mut self, k : Self::Key, v : Self::Value);
    fn get(&self, k : &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V>
where 
    K : std::cmp::Eq + std::hash::Hash
{
    pub storage: std::collections::HashMap<K, V>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where 
    K : std::cmp::Eq + std::hash::Hash
{
    type Key = K; 
    type Value = V;
    fn set(&mut self, k : Self::Key, v : Self::Value) {
        self.storage.insert(k, v);
    }
    fn get(&self, k : &Self::Key) -> Option<&Self::Value> {
        self.storage.get(k)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage:  std::collections::HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Jordan

Jordan-Haidee

12 days ago

5.79ms

197.70kb

// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key; 
    type Value; 
    fn set(&mut self, k : Self::Key, v : Self::Value);
    fn get(&self, k : &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V>
where 
    K : std::cmp::Eq + std::hash::Hash
{
    pub storage: std::collections::HashMap<K, V>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where 
    K : std::cmp::Eq + std::hash::Hash
{
    type Key = K; 
    type Value = V;
    fn set(&mut self, k : Self::Key, v : Self::Value) {
        self.storage.insert(k, v);
    }
    fn get(&self, k : &Self::Key) -> Option<&Self::Value> {
        self.storage.get(k)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage:  std::collections::HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Kyle Diaz

kylediaz

14 days ago

6.46ms

197.70kb

// 1. Finish the trait definition
use std::collections::HashMap;
use std::hash::Hash;
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, k: Self::Key, v: Self::Value);
    fn get(&self, k: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>,
}
impl<Key, Value> KeyValueStore for InMemoryStore<Key, Value> 
where Key: Eq+Hash {
    type Key = Key;
    type Value = Value;
    fn set(&mut self, k: Key, v: Value) {
        self.storage.insert(k, v);
    }
    fn get(&self, k: &Key) -> Option<&Value> {
        self.storage.get(k)
    }
}
// 3. Implement the trait for InMemoryStore
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

automata-studio

14 days ago

5.64ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>
}
// 3. Implement the trait for InMemoryStore
impl<Key: Eq + Hash,Value> InMemoryStore<Key,Value> {
    pub fn set(&mut self, key: Key, value: Value) {
        self.storage.insert(key, value);
    }
    pub fn get(&self, key: &Key) -> Option<&Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Kenneth Love

kennethlove

15 days ago

6.12ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where K: Eq + Hash {
    type Key = K;
    type Value = V;
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
        // match self.storage.get(key) {
        //     Some(value) => Some(value.cloned()),
        //     None => None
        // }
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Marco-Normal

15 days ago

5.94ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
pub trait KeyValueStore {
    type K;
    type V;
    fn set(&mut self, key: Self::K, value: Self::V);
    fn get(&self, key: &Self::K) -> Option<&Self::V>;
}
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
impl<K, V> InMemoryStore<K, V>
where
    K: Eq + Hash,
{
    pub fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    pub fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
    }
}
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Denis SOURON

Brack0

16 days ago

6.00ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>,
}
impl<Key, Value> InMemoryStore<Key, Value>
where
    Key: Eq + Hash,
{
    pub fn set(&mut self, key: Key, value: Value) {
        self.storage.insert(key, value);
    }
    pub fn get(&self, key: &Key) -> Option<&Value> {
        self.storage.get(key)
    }
}

Denis SOURON

Brack0

16 days ago

6.01ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>,
}
impl<Key, Value> Default for InMemoryStore<Key, Value> {
    fn default() -> Self {
        InMemoryStore {
            storage: HashMap::new(),
        }
    }
}
impl<Key, Value> InMemoryStore<Key, Value>
where
    Key: Eq + Hash,
{
    pub fn new() -> Self {
        InMemoryStore::default()
    }
    pub fn set(&mut self, key: Key, value: Value) {
        self.storage.insert(key, value);
    }
    pub fn get(&self, key: &Key) -> Option<&Value> {
        self.storage.get(key)
    }
}

ludovicknecht

16 days ago

6.26ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>
}
// 3. Implement the trait for InMemoryStore
impl<Key: Eq + Hash, Value> KeyValueStore for InMemoryStore<Key, Value> {
    
    type Key = Key;
    type Value = Value;
    fn set(&mut self, key: Key, value: Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Key) -> Option<&Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Algorab

16 days ago

6.71ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
    fn set(&mut self, key: Self::Key, value: Self::Value);
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K,V> {
       pub storage: HashMap<K,V>,
}
// 3. Implement the trait for InMemoryStore
impl <K,V> KeyValueStore for InMemoryStore<K,V>
where K: Eq + Hash {
    type Key = K;
    type Value = V;
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
    fn set(&mut self, key: Self::Key, value: Self::Value) {
       self.storage.insert(key, value);
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

alemack17

17 days ago

6.13ms

197.70kb

use std::collections::HashMap;
use core::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore{
    type Key;
    type Value;
    fn set(&mut self, _: Self::Key, _: Self::Value);
    fn get(&self, _: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<T,U>{
    pub storage: HashMap<T,U>
}
// 3. Implement the trait for InMemoryStore
impl<T,U> KeyValueStore for InMemoryStore<T,U>
    where T:Hash+Eq{
    type Key=T;
    type Value=U;
    fn set(&mut self, k: Self::Key, v: Self::Value){
        self.storage.insert(k,v);
    }
    fn get(&self, k: &Self::Key) -> Option<&Self::Value>{
        self.storage.get(k)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Christopher Nielson

c-nielson

17 days ago

7.37ms

197.70kb

use std::collections::HashMap;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>,
}
// 3. Implement the trait for InMemoryStore
impl<Key, Value> KeyValueStore for InMemoryStore<Key, Value> where Key: Eq + std::hash::Hash{
    type Key = Key;
    type Value = Value;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

iamforgettable

19 days ago

6.72ms

197.70kb

use std::collections::HashMap;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<T, U> {
    pub storage: HashMap<T, U>
}
// 3. Implement the trait for InMemoryStore
impl <T, U>KeyValueStore for InMemoryStore<T, U> 
    where T: Eq + std::hash::Hash,
    {
    type Key = T;
    type Value = U;
    fn get(&self, key: &Self::Key) -> Option<&U> {
        self.storage.get(key)
    }
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

kosay

sarub0b0

19 days ago

6.32ms

197.70kb

use std::collections::HashMap;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where
    K: Eq + std::hash::Hash,
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

rawar089

20 days ago

8.16ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K,V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K,V> KeyValueStore for InMemoryStore<K , V>
where K : Eq + Hash
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
         self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

zahrajavar

21 days ago

12.26ms

197.70kb

// 1. Finish the trait definition
use std::collections::HashMap;
pub trait KeyValueStore{
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key)->Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore <K,V>{
    pub storage: HashMap<K,V>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> where
    K: std::hash::Hash + Eq,
{
    type Key=K;
    type Value=V;
    fn set(&mut self, key: Self::Key, value: Self::Value){
        self.storage.insert(key,value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Nikita Smirnov

Nismirno

21 days ago

7.49ms

197.70kb

use std::{collections::HashMap, hash::Hash};
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where
    K: Hash + Eq,
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Elliott Draper

ejdraper

22 days ago

5.81ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K,V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K,V> KeyValueStore for InMemoryStore<K, V> where K: Eq + Hash {
    type Key = K;
    type Value = V;
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        return self.storage.get(key);
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Justin Maillet

justy777

23 days ago

6.97ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>
}
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where K: Eq + Hash
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Oebelus

oebelus

24 days ago

5.89ms

197.70kb

use std::{collections::HashMap, hash::Hash};
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>
}
// 3. Implement the trait for InMemoryStore
impl<Key, Value> KeyValueStore for InMemoryStore<Key, Value>
where Key: Eq + Hash {
    type Key = Key;
    
    type Value = Value;
    
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Jim Lawton

jimlawton

24 days ago

6.50ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
pub struct InMemoryStore<T, U> {
    pub storage: HashMap<T, U>,
}
impl<T, U> KeyValueStore for InMemoryStore<T, U> 
where
    T: Hash + Eq,
{
    type Key = T;
    type Value = U;
    fn set(&mut self, key: T, value: U) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &T) -> Option<&U> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Stefan Roas

sroas

24 days ago

7.50ms

197.70kb

use std::{collections::HashMap, hash::Hash};
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<T, U> {
    pub storage: HashMap<T, U>,
}
// 3. Implement the trait for InMemoryStore
impl<T, U> KeyValueStore for InMemoryStore<T, U>
where
    T: Hash + Eq,
{
    type Key = T;
    type Value = U;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Shafer Hess

shafer-hess

25 days ago

7.57ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V> 
where K: Eq + Hash
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

Jonathan Voss

jvoss

25 days ago

7.72ms

197.70kb

use std::{collections::HashMap, hash::Hash};
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where
    K: Eq + Hash
{
    type Key = K;
    type Value = V;
    
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

TaiPoole

a month ago

11.84ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>
}
impl<K,V> KeyValueStore for InMemoryStore<K,V> where K: Eq + Hash {
    type Key = K;
    type Value = V;
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>{
        self.storage.get(key)
    }
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

dawwestk

a month ago

9.36ms

197.70kb

use std::{collections::HashMap, hash::Hash};
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where 
    K: Eq + Hash
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}

PangoSea

kapaseker

a month ago

7.03ms

197.70kb

use std::collections::HashMap;
pub trait KeyValueStore {
    type Key;
    type Value;
    // Method to add a key-value pair
    fn set(&mut self, key: Self::Key, value: Self::Value);
    // Method to get a value by key
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// Define the struct InMemoryStore with public fields
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
impl<K, V> InMemoryStore<K, V>
where
    K: std::cmp::Eq + std::hash::Hash,
{
    // Constructor to create a new InMemoryStore
    pub fn new() -> Self {
        InMemoryStore {
            storage: HashMap::new(),
        }
    }
}
// Implement the KeyValueStore trait for InMemoryStore
impl<K, V> KeyValueStore for InMemoryStore<K, V>
where
    K: std::cmp::Eq + std::hash::Hash,
{
    type Key = K;
    type Value = V;
    fn set(&mut self, key: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}
// 3. Implement the trait for InMemoryStore
// Example usage
pub fn main() {
    let mut store: InMemoryStore<String, String> = InMemoryStore {
        storage: HashMap::new(),
    };
    store.set("name".to_string(), "Rust".to_string());
    assert_eq!(store.get(&"name".to_string()), Some(&"Rust".to_string()));
    store.set("language".to_string(), "Rust".to_string());
    assert_eq!(
        store.get(&"language".to_string()),
        Some(&"Rust".to_string())
    );
    assert_eq!(store.get(&"non_existent".to_string()), None);
}