# Which Data Structure Is Mainly Used for Insertion and Deletion of Data at the Same End?

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Scott Campbell

When it comes to handling data, choosing the right data structure is crucial. Depending on the specific requirements of your application, different data structures offer various advantages and disadvantages.

One common requirement is the need for efficient insertion and deletion of data at the same end. In this article, we will explore the data structure that excels in this scenario.

## The Linked List

The linked list is a popular choice when it comes to efficient insertion and deletion of data at the same end. It is a linear data structure composed of nodes, each containing a value and a reference to the next node in the list.

Unlike arrays, which have a fixed size and require elements to be shifted when inserting or deleting, linked lists provide flexibility by dynamically allocating memory for each node as needed. This allows for constant-time insertions and deletions at both ends of the list.

### The Singly Linked List

A singly linked list is a basic type of linked list where each node only has a reference to the next node. The first node in the list is called the head, while the last node’s reference points to null.

To insert an element at the end of a singly linked list, we traverse from the head until we reach the last node. Then we assign its reference to our new node and update it as the new last element.

• Create a new node with the desired value.
• Traverse from the head until reaching the last node (node.next == null).
• Assign our new node’s reference to null, making it point to our new node.
• Update our new node as the last element (node = newNode).

To delete an element at the end of a singly linked list, we also traverse from the head until we reach the second-to-last node. Then we update its reference to null and update it as the new last element.

• Traverse from the head until reaching the second-to-last node (node.next.
• Assign null to its reference, making it point to null.
• Update our new last element (node = node.next).

### The Doubly Linked List

A doubly linked list is an extension of the singly linked list where each node has references to both the next and previous nodes. This allows for more efficient deletion operations, as we don’t need to traverse the list from the beginning.

To insert an element at the end of a doubly linked list, we simply create a new node, assign its reference to null, update its previous reference with the current last node, and update it as the new last element.

• Assign null to its next reference, making it point to null.
• Assign our current last node as its previous reference (newNode.prev = lastNode).
• Update our new node as the last element (lastNode = newNode).
• To delete an element at the end of a doubly linked list, we can directly update our current last node by assigning its previous node as our new last element.

• Assign our current last node’s previous reference as our new last element (lastNode = lastNode.prev).

## Conclusion

The linked list, particularly the singly and doubly linked lists, is the go-to data structure for efficient insertion and deletion of data at the same end. Its dynamic memory allocation and constant-time operations make it a versatile choice for scenarios where flexibility and performance are key.

Remember to carefully consider your specific requirements when choosing a data structure. While the linked list shines in certain scenarios, other data structures may be more suitable depending on different factors such as search or access time.