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 instead 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

00bayz

an hour ago

10.43ms

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: Eq + Hash, 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);
}

Itisjustantheory

10 hours ago

14.61ms

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>;
}
// 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 : std::hash::Hash + std::cmp::Eq,{
    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);
}

Galadima3X

Galadima3

a day ago

10.44ms

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>
}
impl<Key, Value> KeyValueStore for InMemoryStore<Key, Value> 
where Key: std::hash::Hash + std::cmp::Eq, {
    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)
    }
}

ts223883-sys

2 days ago

11.86ms

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: std::hash::Hash + std::cmp::Eq,  
{
    
    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);
}

Lanayr

4 days ago

8.88ms

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: std::hash::Hash + std::cmp::Eq,
{
    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);
    }
    type Key = Key;
    type Value = 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);
}

Zodiacsyndicate

ZodiacSyndicate

4 days ago

11.40ms

197.70kb

use std::collections::HashMap;
// 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<Key, Value> {
   pub storage: HashMap<Key, Value>,
}
// 3. Implement the trait for InMemoryStore
impl<Key, Value> KeyValueStore for InMemoryStore<Key, Value>
where
    Key: std::hash::Hash + std::cmp::Eq,
{
    type Key = Key;
    type Value = Value;
    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);
}

endwhiteparadox

5 days ago

10.85ms

197.70kb

// 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
use std::collections::HashMap;
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K: Eq + std::hash::Hash, 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);
}

Hin Phansa

hinphansa

5 days ago

11.66ms

197.70kb

use std::{collections::HashMap, hash::Hash};
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key;
    type Value;
    fn get(&self, k: &Self::Key) -> Option<&Self::Value>;
    fn set(&mut self, k: Self::Key, v: 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: Hash + Eq,
    V: Clone,
{
    type Key = K;
    type Value = V;
    fn get(&self, k: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(&k)
    }
    fn set(&mut self, k: Self::Key, v: Self::Value) {
        self.storage.insert(k, v);
    }
}
// 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);
}

Henry Hsieh

henry-hsieh

5 days ago

9.15ms

197.70kb

use std::collections::HashMap;
pub trait KeyValueStore {
    type Key;
    type Value;
    fn set (&mut self, key: Self::Key, val: 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 + core::hash::Hash
{
    type Key = K;
    type Value = V;
    fn set (&mut self, key: K, val: V) {
        self.storage.insert(key, val);
    }
    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);
}

Yuan Xu

yuan1789

6 days 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 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);
}

Yuan Xu

yuan1789

6 days ago

7.65ms

197.70kb

use std::collections::HashMap;
// 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: Eq + std::hash::Hash, V> KeyValueStore for InMemoryStore<K, V> {
    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);
}

NPComplete

dbrowne

7 days ago

8.31ms

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: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        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);
}

Edwin

ark930

9 days ago

7.39ms

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);
}

Shinolr

12 days ago

9.72ms

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: 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);
}

Wei Shen

shenwei356

15 days ago

8.54ms

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 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);
}

Parshant Singh

singhparshant

16 days ago

9.00ms

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);
}

Parshant Singh

singhparshant

16 days ago

9.80ms

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);
}

Jungseok Lee

jungseoklee

17 days ago

9.59ms

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);
}

Hugo Varani

hgvarani

18 days ago

9.33ms

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, Value> KeyValueStore for InMemoryStore<Key, Value>
where Key: Eq + Hash {
    type Key = Key;
    type Value = Value;
    fn set(&mut self, key: Key, value: 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);
}

vraneb

19 days ago

7.70ms

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);
}

Mohamed Ahmed Beder

Beder-asu

19 days ago

7.65ms

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);
}

Oraan Khunphisuth

orankhu

19 days ago

8.30ms

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);
}

Ricardo Freire

seccone

20 days ago

7.16ms

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<T, U> {
    pub storage: HashMap<T, U>
}
// 3. Implement the trait for InMemoryStore
impl<T: Eq + Hash, U> KeyValueStore for InMemoryStore<T, U> {
    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);
}

Antonio Santiago

acanimal

20 days ago

8.00ms

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<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);
}

Jérémie Bolduc

jeremiebolduc

22 days ago

6.92ms

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: 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);
}

kpm831

22 days ago

8.23ms

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>,
}
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)
    }
}
// 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);
}

mohamedsoftware1

24 days ago

6.08ms

197.70kb

use std::collections::HashMap;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key: std::cmp::Eq + std::hash::Hash;
    type Value;
    fn set(&mut self, key: Self::Key, value: Self::Value);
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
}
// Make sure the fields are public
pub struct InMemoryStore<Key, Value>
where Key: std::cmp::Eq + std::hash::Hash{
    pub storage: HashMap<Key, Value>,
}
// 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, 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);
}

mohamedsoftware1

24 days ago

6.54ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
use std::cmp::Eq;
// 1. Finish the trait definition
pub trait KeyValueStore<Key, Value> {
    fn set(&mut self, key: Key, value: Value);
    fn get(&self, key: &Key) -> Option<&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<Key, Value> for InMemoryStore<Key, Value> 
where
    Key: Eq + Hash,
{
    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);
}

Sander Boelhouwers

sander-b-postnl

25 days ago

7.36ms

197.70kb

use std::{collections::HashMap, 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>,
}
impl<K: Hash + Eq, V> KeyValueStore for InMemoryStore<K, V> {
    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);
    }
}
// 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);
}

CTerasa

a month ago

6.09ms

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, 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<T,U>{
    pub storage: HashMap<T, U>
}
// 3. Implement the trait for InMemoryStore
impl<T: Eq + Hash, U> KeyValueStore for InMemoryStore<T, U> {
    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);
}

Ugo VENTURE

Swymn

a month ago

6.05ms

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>
}
impl<K: Hash + Eq, V> KeyValueStore for InMemoryStore<K, V> {
    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);
    }
}
// 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);
}

jpruitt77

a month ago

5.90ms

197.70kb

use std::{collections::HashMap, hash::Hash};
/* USING GENERICS */
// // 1. Finish the trait definition
// pub trait KeyValueStore<K,V> {
//     fn set(&mut self, key: K, value: V);
//     fn get(&self, key: &K) -> Option<&V>;
// }
// // 2. Implement the trait for InMemoryStore
// // Make sure the fields are public
// pub struct InMemoryStore<K, V> {
//     pub storage: HashMap<K, V>
// }
// impl<K: Hash + Eq, V> KeyValueStore<K, V> for InMemoryStore<K, 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)
//     }
// }
/* USING ASSOCIATED TYPES */
// 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: 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);
}

jpruitt77

a month ago

6.07ms

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>
}
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);
}

jaime

jaime0815

a month ago

6.34ms

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>;
}
**/
pub trait KeyValueStore<K, V> {
    fn set(&mut self, key: K, value: V);
    fn get(&self, key: &K) -> Option<&V>;
}
// Make sure the fields are public
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
impl<K: Hash + Eq, V> KeyValueStore<K, V> 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)
    }
    **/
     
    fn set(&mut self, key: K, value: V) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &K) -> Option<&V> {
        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);
}

Baily

baily-zhang

a month ago

6.41ms

197.70kb

 use std::collections::HashMap;
 use std::hash::Hash;
 // Define the KeyValueStore trait with associated types
 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>;
 }
 // Define the InMemoryStore struct with generic parameters
 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: 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)
     }
 }
 // Add a constructor for convenience
 impl<K, V> InMemoryStore<K, V>
 where
     K: Eq + Hash,
 {
     pub fn new() -> Self {
         InMemoryStore {
             storage: HashMap::new(),
         }
     }
 }
 
  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);
}

StevenCanDrink

a month ago

7.07ms

197.70kb

use std::collections::HashMap;
// 1. Trait definition - make it generic or use associated types
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. InMemoryStore struct with generic parameters
pub struct InMemoryStore<K, V> {
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore with associated types
impl<K, V> KeyValueStore for InMemoryStore<K, V> where K: std::cmp::Eq + std::hash::Hash {
    type Key = K;
    type Value = V;
    fn get(&self, key: &K) -> Option<&V> {
        self.storage.get(key)
    }
    fn set(&mut self, key: K, value: V) {
        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);
}

mihaya

mihaya03

a month ago

7.74ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore<K, V> {
    fn set(&mut self, key: K, value: V);
    fn get(&self, key: &K) -> Option<&V>;
}
// 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<K, V> for InMemoryStore<K, V>
where
    K: Eq + Hash,
{
    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);
}

Artyom Chebotarev

Derik117

a month ago

5.94ms

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: 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);
}

Atanas Krondev

AtanasKrondev

a month ago

5.53ms

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: std::collections::HashMap<K, V>,
}
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)
    }
}
// 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);
}

zibuyu28

a month ago

5.69ms

197.70kb

use std::collections::HashMap;
// 1. Finish the trait definition
pub trait KeyValueStore<T,V> {
    fn get(&self,k: &T) -> Option<&V>;
    fn set(&mut self,k: T, v: V);
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<T, V> 
where
    T: Eq + std::hash::Hash{
    pub storage: HashMap<T, V>
}
// 3. Implement the trait for InMemoryStore
impl <T,V> KeyValueStore<T,V> for InMemoryStore<T,V> 
where 
    T: Eq + std::hash::Hash {
    fn set(&mut self, k: T, v: V) {
        self.storage.insert(k, v);
    }
    fn get(&self, key: &T) -> 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);
}

jcarey9149

a month ago

6.72ms

197.70kb

use std::collections::HashMap;
// 1. Finish the trait definition
pub trait KeyValueStore<K,V> {
    fn set(&mut self, key:K, value: V);
    fn get(&self, key:&K) -> Option<&V>;
}
// 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> InMemoryStore<K, V> {
    pub fn new() -> Self {
        InMemoryStore {
            storage: HashMap::new(),
        }
    }
}
impl <K,V> KeyValueStore<K,V> for InMemoryStore<K,V>
    where
        K: Eq + std::hash::Hash,
        V: Clone {
    
            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);
}

Ignat S.

Igonato

a month ago

5.32ms

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);
}

gtakacse

a month ago

5.53ms

197.70kb

use std::{collections::HashMap, 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: Eq + Hash, 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: 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);
}

Luiz Pinheiro

lgabriellp

a month ago

8.39ms

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>;
}
pub struct InMemoryStore<Key, Value> {
    pub storage: HashMap<Key, Value>,
}
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);
}

0xdangit

a month ago

7.03ms

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: Eq + Hash,V> KeyValueStore for InMemoryStore<K,V> {
    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);
}

Hariom

om-secadvice

2 months ago

6.47ms

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: std::hash::Hash + std::cmp::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);
}

Özgür

AyikOzgur

2 months ago

7.30ms

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<KeyType, ValueType> {
    pub storage: HashMap<KeyType, ValueType>,
}
// 3. Implement the trait for InMemoryStore
impl<KeyType: std::cmp::Eq + std::hash::Hash, ValueType> KeyValueStore for InMemoryStore<KeyType, ValueType> {
    
    type Key = KeyType;
    type Value = ValueType;
    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);
}

Egu0

egu0

2 months ago

6.31ms

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> InMemoryStore<K, V> {
    pub fn new() -> Self {
        InMemoryStore {
            storage: HashMap::new(),
        }
    }
}
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)
    }
}

Snoweuph

snoweuph

2 months ago

5.25ms

197.70kb

use std::{collections::HashMap, 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: Self::Key, value: Self::Value) {
        self.storage.insert(key, value);
    }
    fn get(&self, key: &Self::Key) -> Option<&Self::Value> {
        self.storage.get(key)
    }
}

azmahflameheart

2 months ago

5.73ms

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: Eq + Hash, 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);
}