# What Are the Operation Performed on List in Data Structure?

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Angela Bailey

## What Are the Operations Performed on Lists in Data Structure?

In data structures, a list is an ordered collection of elements. Lists are widely used because of their flexibility and efficiency in manipulating data.

There are various operations that can be performed on lists to insert, delete, or retrieve elements. Let’s explore some of the common operations performed on lists in data structures.

### 1. Insertion

Insertion is the process of adding an element to a list at a specific position. This operation allows you to expand the list and accommodate new elements.

There are two main types of insertions: insertion at the beginning and insertion at a specific position. To insert an element at the beginning, you can use the following steps:

1. Create a new node with the desired value.
2. Set the next pointer of the new node to point to the current first node.
3. Set the head pointer to point to the new node.

To insert an element at a specific position, you need to traverse the list until reaching the desired position and then perform similar steps as above.

Another method for insertion is appending an element at the end of the list. Here are the steps for appending:

1. Create a new node.
2. If it’s an empty list, set both head and tail pointers to point to this new node.
3. If it’s not an empty list, set tail’s next pointer to point to the new node and update the tail pointer to the new node.

### 2. Deletion

Deletion is the process of removing an element from a list. Similar to insertion, there are different types of deletions: deletion from the beginning, deletion from a specific position, and deletion by value.

To delete an element from the beginning, you can follow these steps:

1. Set the head pointer to point to the second node.
2. Delete the first node.

To delete an element from a specific position, you need to traverse the list until reaching that position and then perform similar steps as above.

The deletion by value involves searching for a particular value in the list and removing that element. Here are the steps:

1. Start traversing from the head.
2. If found, set the previous node’s next pointer to point to the next node of the current node.
3. Delete the current node.

### 3. Searching

Searching is used to find whether an element is present in a list or not. There are different methods for searching, such as linear search and binary search.

In linear search, you traverse through each element of the list until either finding a match or reaching the end of the list.

Binary search is applicable only on sorted lists. It involves dividing and conquering the list by repeatedly comparing the middle element with the Target element until finding a match or determining that the Target element is not in the list.

Both methods have their own time complexities and are suitable for different scenarios.

### 4. Accessing

Accessing refers to retrieving an element from a specific position in the list. To access an element, you need to traverse through the list until reaching the desired position. Once you reach that position, you can retrieve the value of that element.

The time complexity for accessing an element is O(n), where n is the number of elements in the list.

### 5. Updating

Updating involves modifying or changing the value of an existing element in a list. To update an element, you need to traverse through the list until reaching that specific position and then update its value.

The time complexity for updating an element is also O(n), where n is the number of elements in the list.

### Conclusion

Lists are fundamental data structures that allow efficient manipulation of data. The operations performed on lists, such as insertion, deletion, searching, accessing, and updating, enable us to organize and modify data effectively.

By understanding these operations and their implementations, you can leverage lists to efficiently manage and process large amounts of data in various applications.