Delete Node By Value From Linked List In JavaScript

1. Overview

Deleting a node from a linked list in JavaScript is quite easy, depending on where the node is located. If the node to be deleted is the root, simply delete it. To delete a middle node, you need to have a pointer to the node that comes before it. Then, you can point the previous node’s next pointer to the node after the one you want to delete and free up the memory for that node.

Similarly, if you want to remove the last node from the list, you need to traverse it until you find it and maintain an extra pointer as well. Finally, if you want to remove an element from in between, loop through and check for the value until you find it and then delete it accordingly.

2. How To Delete Node By Value From Linked List In JavaScript

Deleting a node from a linked list in JavaScript can be done quickly and easily. Using an iterative approach, you can easily find the node with the desired value and delete it from the list. This can be done by finding the given position of the node and then changing the next pointer of the node before it to null.

The benefits of deleting a node from a linked list in JavaScript include being able to quickly add or remove nodes without reorganizing the entire data structure. Additionally, you can create a pop method to delete the last node on the list.

3. Implementation Of Delete Node By Value From Linked List

 it('Implementation Of Delete Node By Value From Linked List', () => {
    const linkedList = new LinkedList();

    expect(linkedList.delete(5)).toBeNull();

    linkedList.append(1);
    linkedList.append(1);
    linkedList.append(2);
    linkedList.append(3);
    linkedList.append(3);
    linkedList.append(3);
    linkedList.append(4);
    linkedList.append(5);

    expect(linkedList.head.toString()).toBe('1');
    expect(linkedList.tail.toString()).toBe('5');

    const deletedNode = linkedList.delete(3);
    expect(deletedNode.value).toBe(3);
    expect(linkedList.toString()).toBe('1,1,2,4,5');

    linkedList.delete(3);
    expect(linkedList.toString()).toBe('1,1,2,4,5');

    linkedList.delete(1);
    expect(linkedList.toString()).toBe('2,4,5');

    expect(linkedList.head.toString()).toBe('2');
    expect(linkedList.tail.toString()).toBe('5');

    linkedList.delete(5);
    expect(linkedList.toString()).toBe('2,4');

    expect(linkedList.head.toString()).toBe('2');
    expect(linkedList.tail.toString()).toBe('4');

    linkedList.delete(4);
    expect(linkedList.toString()).toBe('2');

    expect(linkedList.head.toString()).toBe('2');
    expect(linkedList.tail.toString()).toBe('2');

    linkedList.delete(2);
    expect(linkedList.toString()).toBe('');
  });

4. Conclusion

In conclusion, deleting a node from a linked list in JavaScript is a relatively straightforward task. To do so, you must traverse the list until you find the node that contains the value you wish to delete.

Once the node is located, you must unlink it from the list by changing the pointer of the previous node to point to the next node. Additionally, if you are deleting from the end of the list, you will need to traverse to the second last element and change its next pointer. With these steps in mind, it should not be difficult to delete nodes from a linked list in JavaScript.

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padmaraj

Dr. Padmaraj works as a code consultant for international students on this platform. Dr. Padmaraj influence young students to achieve their coding dreams. He is a recognized scholar and a leading expert in coding and technology. Today, via devoutput.com he helps students apply their coding skills to create software applications. Doctor.Padmaraj is a renowned author whose books are available worldwide on Amazon.

1. Overview

2. How To Delete Node By Value From Linked List In JavaScript

3. Implementation Of Delete Node By Value From Linked List

4. Conclusion

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