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

azmahflameheart

5 hours 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);
}

RaDo

rado31

9 hours ago

5.91ms

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);
}

vqk-2003

2 days ago

6.58ms

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

ffrie

2 days ago

5.81ms

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: Eq + Hash, V> {
    pub storage: HashMap<K, V>,
}
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)
    }
}
// 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);
}

Ramon Silva

rsilva1

3 days ago

6.45ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore {
    type Key: Eq + Hash;
    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: 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);
    }
}
// 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);
}

Yashwanth

Yash981

3 days ago

5.84ms

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);
}

LawisChen

5 days ago

5.72ms

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>
where
    Key: Hash + Eq,
{
    pub storage: HashMap<Key, Value>,
}
impl<Key, Value> KeyValueStore for InMemoryStore<Key, Value>
where
    Key: Hash + 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)
    }
}
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);
}

Omar Saber Talaat Abdelrahman

omar-s-ta

7 days ago

6.91ms

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: 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)
    }
}
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);
}

ychanghe

8 days ago

5.77ms

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

reborn3d

8 days ago

6.83ms

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

fasolyee

fasolyeedev

8 days ago

6.58ms

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, 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
#[derive(PartialEq)]
pub struct InMemoryStore<Key_: Eq + Hash, Value_: PartialEq>{
    pub storage: HashMap<Key_,Value_>
}
// 3. Implement the trait for InMemoryStore
impl <Key_:Eq + Hash,Value_: std::cmp::PartialEq >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<&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);
}

makinpaper

9 days ago

6.54ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
// 1. Finish the trait definition
pub trait KeyValueStore<Key, Value> {
    fn get(&self, key: &Key) -> Option<&Value>;
    fn set(&mut self, key: Key, value: Value);
}
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
#[derive(PartialEq)]
pub struct InMemoryStore<Key: Eq + Hash, Value: PartialEq> {
    pub storage: HashMap<Key, Value>,
}
// 3. Implement the trait for InMemoryStore
impl<Key: Eq + Hash, Value: PartialEq> KeyValueStore<Key, Value> for InMemoryStore<Key, Value> {
    fn get(&self, key: &Key) -> Option<&Value> {
        self.storage.get(key)
    }
    fn set(&mut self, key: Key, value: 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);
}

SpontaneousOverthrow

10 days ago

6.12ms

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, 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: 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);
}

SpontaneousOverthrow

10 days ago

7.05ms

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, 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: 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);
}

Dan Wayne

danwayne-me

11 days ago

6.03ms

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);
}

<YoungAncient/>

youngancient

11 days ago

6.32ms

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: Eq + Hash,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);
}

<YoungAncient/>

youngancient

11 days ago

6.64ms

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<K: Eq + Hash,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);
}

Kishan

wdcs-kishansudani

18 days ago

6.14ms

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<T, U> {
    pub storage: HashMap<T, U>,
}
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);
}

Asrul Firdaus

AsrulF

19 days ago

6.26ms

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);
}

kasaxpong

19 days ago

6.86ms

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
#[derive(Debug)]
pub struct InMemoryStore<K, U> {
    pub storage: HashMap<K, U>
}
impl<K: Eq + std::hash::Hash, U> KeyValueStore for InMemoryStore<K, U> {
    type Key = K;
    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)
    }
}
// 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);
}

Dharm Singh

dharmvr1

21 days ago

8.34ms

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
#[derive(Debug)]
pub struct InMemoryStore<K, U> {
    pub storage: HashMap<K, U>,
}
impl<K: Eq + std::hash::Hash, U> KeyValueStore for InMemoryStore<K, U> {
    type Key = K;
    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)
    }
}
// 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);
}

Mykhailo Huzhvii

Ymkavi

24 days ago

5.89ms

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>;
}
// 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: 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, 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);
}

银雀Sparrxw

Sparr0www820

a month ago

6.26ms

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>
where
    K: std::cmp::Eq+ std::hash::Hash
{
    pub storage: 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, 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);
}

danyaffe63

a month ago

6.68ms

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>
    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);
}

Ari Karim

arikarim

a month ago

6.29ms

197.70kb

use std::collections::HashMap;
pub trait KeyValueStore {
    type Key;
    type Value;
    fn get(&self, key: &Self::Key) -> Option<&Self::Value>;
    fn set(&mut self, key: Self::Key, val: Self::Value);
}
pub struct InMemoryStore<T, U> {
    // storage: HashMap<<InMemoryStore as KeyValueStore>::Key, <InMemoryStore as KeyValueStore>::Value>
    pub storage: HashMap<T, U>,
}
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: &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);
}

Yummy-Yums

a month ago

6.16ms

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>,
}
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);
}

Vincent SAMY

vsamy

a month ago

8.23ms

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 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);
}

thriller08

a month ago

7.91ms

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> where K: Eq + Hash, {
    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)
    }
}
// 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);
}

Francisco Alejandro

francisco-alejandro

a month ago

7.63ms

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);
}

Abhishek Sharma

0xAbhiDev

a month ago

5.47ms

197.70kb


use std::collections::HashMap;
use std::hash::Hash;
use std::cmp::Eq;
// 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 set(& mut self , key:Self::Key , value:Self::Value){
        self.storage.insert(key,value);
    }
    fn get(& self , key:&Self::Key)->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);
}

nojae15

a month ago

7.11ms

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>
where K: Eq + Hash,
{
    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);
}

jfloresremar

a month ago

6.37ms

197.70kb

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

QuJohan

2 months ago

5.99ms

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, 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: 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);
}

ghoti225

2 months ago

7.08ms

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> 
where
    K: Eq  + Hash,
{
    pub storage: HashMap<K, V>,
}
// 3. Implement the trait for InMemoryStore
impl<K,V> KeyValueStore for InMemoryStore<K,V> 
where
    K: Eq  + Hash,  // NOTE only K needs these traits for HashMap, not 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);
}

Omar

OmniKobra

2 months ago

7.14ms

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, val: 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, val: Self::Value) {
        self.storage.insert(key, val);
    }
     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);
}

Abdul

aisiyoup

2 months ago

7.41ms

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, 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);
}

TheJanzap

2 months 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>;
}
// 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: Hash + Eq, 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);
}

jh4vision

2 months ago

6.95ms

197.70kb

use std::hash::Hash;
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: Hash + Eq, 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);
}

jh4vision

2 months ago

5.79ms

197.70kb

use std::hash::Hash;
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: Hash + Eq, 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);
}

Artem

artemnistuley

2 months ago

5.93ms

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: Eq + Hash, I> {
    pub storage: HashMap<T, I>,
}
// 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);
}

Christophe Mohimont

mohic

2 months ago

5.76ms

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: Eq + Hash, V> {
    pub storage: HashMap<K, V>,
}
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)
    }
}

muemart

2 months ago

5.57ms

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<KeyType: Eq + std::hash::Hash, ValueType> KeyValueStore for InMemoryStore<KeyType, ValueType> {
    type Key = KeyType;
    type Value = ValueType;
    fn set(&mut self,  key: KeyType, value: ValueType){
        self.storage.insert(key, value);
    }
    fn get(&self, key: &KeyType) -> Option<&ValueType> {
        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);
}

Smith, Taylor

a647965_fidelity

2 months ago

6.36ms

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>;
}
use std::hash::Hash;
// 2. Implement the trait for InMemoryStore
// Make sure the fields are public
pub struct InMemoryStore<Key, Value>
where Key: Eq + Hash {
    pub storage: HashMap<Key, Value>,
}
// 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: 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);
}

Jai

jsat97

2 months ago

6.94ms

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
//#[derive(Hash, Eq, PartialEq, Debug)]
pub struct InMemoryStore <T1, T2> {
    pub storage: HashMap<T1, T2>,
}
// 3. Implement the trait for InMemoryStore
impl <T1,T2>KeyValueStore for InMemoryStore<T1, T2> 
where T1:Hash+Eq
{
    type Key = T1;
    type Value = T2;
    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);
}

amdfxlucas

2 months ago

6.04ms

197.70kb

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

StevenCanDrink

2 months ago

5.78ms

197.70kb

use std::{ collections::HashMap, hash::Hash };
// 1. Finish the trait definition
pub trait KeyValueStore<K, V> {
    fn get(&self, x: &K) -> Option<&V>;
    fn set(&mut self, x: K, y: 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 get(&self, x: &K) -> Option<&V> {
        self.storage.get(x)
    }
    fn set(&mut self, x: K, y: V) -> () {
        self.storage.insert(x, y);
    }
}
// 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);
}

StevenCanDrink

2 months ago

6.29ms

197.70kb

use std::{ collections::HashMap, hash::Hash };
// 1. Finish the trait definition
pub trait KeyValueStore<K, V> {
    fn get(&self, x: &K) -> Option<&V>;
    fn set(&mut self, x: K, y: 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 get(&self, x: &K) -> Option<&V> {
        self.storage.get(x)
    }
    fn set(&mut self, x: K, y: V) -> () {
        self.storage.insert(x, y);
    }
}
// 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);
}

Chih Ying Yen

xavierforge

3 months ago

5.92ms

197.70kb

use std::collections::HashMap;
use std::hash::Hash;
use std::cmp::Eq;
// 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: 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);
}

undefeated_

boyboi86

3 months ago

5.91ms

197.70kb

// 1. Finish the trait definition
use std:: {collections::HashMap, hash::Hash, cmp::Eq};
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, k: Self::Key, v: Self::Value) {
        self.storage.insert(k, v);
    }
    fn get(&self, k: &Self::Key) -> 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);
}

David Rasch

dcrasch

3 months ago

6.29ms

197.70kb

use std::collections::HashMap;
// 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>
{
    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, 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);
}