Implementation of Hash Table Data Structure

The HashTable class represents a custom implementation of a hash table data structure in JavaScript. It provides methods to set key-value pairs, retrieve values by keys, and retrieve all keys stored in the hash table.

The class uses a simple hash function to convert keys into indices within the underlying array (dataMap) for efficient storage and retrieval. The example demonstrates how to create an instance of the HashTable class and use it to store and retrieve key-value pairs.