# Which Data Structure Can Be Implemented Using Singly Linked List?

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Heather Bennett

Which Data Structure Can Be Implemented Using Singly Linked List?

A singly linked list is a popular data structure that consists of nodes connected in a linear manner. Each node contains two parts: the data and a reference to the next node in the list.

This simple yet versatile structure can be used to implement various other data structures efficiently. In this article, we will explore some of the most common data structures that can be implemented using a singly linked list.

## Stack

A stack is a data structure that follows the Last-In-First-Out (LIFO) principle. It supports two main operations: push and pop.

By using a singly linked list, we can easily implement a stack. The top of the stack will always be the head node of the linked list, and pushing or popping elements involves adding or removing nodes from the head.

## Queue

A queue is another fundamental data structure that follows the First-In-First-Out (FIFO) principle. It supports two primary operations: enqueue and dequeue.

By utilizing a singly linked list, we can efficiently implement a queue. The head of the linked list represents the front of the queue, and enqueue and dequeue operations involve adding or removing nodes from opposite ends of the list.

Ironically, one of the most common use cases for a singly linked list is to implement another linked list! A doubly linked list requires each node to store references to both its previous and next nodes, which can be memory-intensive for certain applications. On the other hand, implementing a doubly linked list using a singly linked list only requires storing references to next nodes.

In a circular linked list, the last node’s reference points back to the head of the list, creating a loop. This data structure is useful in scenarios where we need to iterate through a list indefinitely or efficiently rotate elements. Implementing a circular linked list can be achieved by utilizing a singly linked list and updating the reference of the last node to point back to the head.

## Symbol Table

A symbol table, also known as a dictionary or associative array, is a data structure that stores key-value pairs. By using a singly linked list, we can efficiently implement this structure by storing key-value pairs as separate nodes. Searching for a specific key in the symbol table involves traversing the linked list until we find the desired key or reach the end.

### Conclusion

A singly linked list is not only a powerful data structure on its own but can also be used as an underlying implementation for various other data structures. From stacks and queues to circular linked lists and symbol tables, understanding how to utilize a singly linked list opens up numerous possibilities for efficient and elegant solutions in software development.