Optimizing Data Storage: Hash Maps with Collision Handling in TypeScript

Dear TypeScript Enthusiasts,

In the world of data structures, Hash Maps stand tall as efficient storage mechanisms, offering speedy data access. Today, let's delve into the intricacies of implementing a Hash Map in TypeScript, with a focus on collision handling for optimal data management.

Understanding Hash Maps and Collisions

A Hash Map, or Hash Table, relies on a hashing function to map keys to their respective values, allowing constant-time retrieval in ideal scenarios. However, collisions, where multiple keys hash to the same index, pose a challenge in maintaining data integrity.

Collision Handling Techniques:

• Chaining: Using linked lists or arrays to store multiple elements hashed to the same index.

• Open Addressing: Probing or searching for alternative slots when collisions occur.

TypeScript Implementation - Handling Collisions

class KeyValuePair<K, V> {
    key: K;
    value: V;

    constructor(key: K, value: V) {
        this.key = key;
        this.value = value;
    }
}

class HashMap<K, V> {
    private size: number;
    private map: Array<Array<KeyValuePair<K, V>>>;

    constructor(size: number) {
        this.size = size;
        this.map = new Array<Array<KeyValuePair<K, V>>>(size);
        for (let i = 0; i < size; i++) {
            this.map[i] = [];
        }
    }

    private hashFunction(key: K): number {
        // Implement your hash function here
        // Example: return someHash(key) % this.size;
    }

    insert(key: K, value: V): void {
        const index = this.hashFunction(key);
        const keyValue: KeyValuePair<K, V> = new KeyValuePair(key, value);
        this.map[index].push(keyValue);
    }

    get(key: K): V | undefined {
        const index = this.hashFunction(key);
        const bucket = this.map[index];
        for (const pair of bucket) {
            if (pair.key === key) {
                return pair.value;
            }
        }
        return undefined;
    }
}

// Example Usage:
const hashMap = new HashMap<string, number>(10);
hashMap.insert("apple", 5);
hashMap.insert("banana", 8);
console.log(hashMap.get("apple")); // Output: 5
console.log(hashMap.get("banana")); // Output: 8

Real-World Applications

Hash Maps with collision handling find applications in database indexing, language interpreters, and caching systems, ensuring efficient data retrieval and management.

Conclusion

Understanding collision handling techniques in Hash Maps elevates our ability to efficiently store and access data. Leveraging TypeScript's versatility, we can implement robust Hash Maps, optimizing data storage in our applications.

Happy Hashing!