HashTable vs. Dictionary vs. HashSet

Introduction

Before solving any challenges regarding hash tables, it is necessary to look at the implementations of HashTable, Dictionary, and HashSet and see how they are different. All three are built-in data structures in C#. It is also a common misconception that these three structures are the same, but they are very different from each other.

🔍 Hashtable

Hashtable is a collection of key/value pairs arranged based on the hash code of the key. It is the non-generic type of collection, which is defined in System.Collections namespace.

It provides the basic functionality of hashing, along with some helper functions that help in the process of insertion, deletion, and search.

Some of the key features of HashTable are given below:

• A HashTable stores key-value pairs (examples given below) to map a key to the value:

$$abc->123$$

$$xyz->456$$

• HashTable cannot contain

...