Hashmaps are one of the most versatile data structures in Rust, providing a way to store key-value pairs. They are part of the standard library and offer a convenient way to associate values with unique keys. In this challenge, you will implement a simple key-value store using Rust's HashMap
.
The HashMap
type is part of the std::collections
module and allows you to perform operations such as inserting, retrieving, and removing elements efficiently.
You are tasked with implementing two functions for a key-value store:
insert_or_update
: Inserts a new key-value pair into the HashMap
, or updates the value if the key already exists.get_value
: Retrieves a value by its key. If the key is not present, return None
.You will write both functions to work with a HashMap<String, String>
.
HashMap<String, String>
, a key of type String
, and a value of type String
.HashMap<String, String>
and a key of type String
.Option<String>
:
Some(value)
if the key is present.None
if the key is absent.HashMap
type from std::collections
..insert()
method of HashMap
..get()
method of HashMap
.use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here.. map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... if map.contains_key(&key){ return Some(map[&key].clone()); } else{ return None; }}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).map(|v| v.clone())}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.entry(key).and_modify(|entry| *entry=value.clone()).or_insert(value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.entry(key).and_modify(|x| *x = value.clone()).or_insert(value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key,value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;use std::collections::hash_map::Entry;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... match map.entry(key) { Entry::Occupied(mut entry) => { *entry.get_mut() = value; } Entry::Vacant(entry) => { entry.insert(value); } }}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}pub fn main() { let mut store = HashMap::new(); insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value); return}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); println!("{:?}", store); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.entry(key).and_modify(|val| *val = value.clone()).or_insert(value); return}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key,value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key,value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: impl AsRef<str>) -> Option<String> { map.get(key.as_ref()).cloned() }// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... map.get(&key).cloned()}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key,value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... match map.get(&key) { Some(v) => Some(v.clone()), None => None }}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { // Your code here... map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... match map.get(&key) { Some(value) => { Some(value.clone()) } None => None }}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}
use std::collections::HashMap;/// Inserts a key-value pair into the hashmap or updates the value if the key exists.pub fn insert_or_update(map: &mut HashMap<String, String>, key: String, value: String) { map.insert(key, value);}/// Retrieves the value associated with a key from the hashmap.pub fn get_value(map: &HashMap<String, String>, key: String) -> Option<String> { // Your code here... if let Some(val) = map.get(&key) { return Some(val.to_owned()) } None}// Example usagepub fn main() { let mut store = HashMap::new(); // Insert a new key-value pair insert_or_update(&mut store, "name".to_string(), "Alice".to_string()); // Update an existing key insert_or_update(&mut store, "name".to_string(), "Bob".to_string()); // Retrieve the value by key let value = get_value(&store, "name".to_string()); assert_eq!(value, Some("Bob".to_string())); // Try to get a non-existent key let missing = get_value(&store, "age".to_string()); assert_eq!(missing, None);}