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A linked list JS is indeed one data structure you should be familiar with once deciding to dig into such an aspect. This page is home to those who don’t properly grasp it or how to execute it in JavaScript.
So, wait no longer but let’s get going together!
What Is A Linked List JS?
A linked list (so-called linear data structure)’s chief mission is to demonstrate a set of elements by having each one point to the next.
As such, the head and tail shall be the first and last elements, respectively, in a linked list. The head of a list will become a null reference if that list contains nothing.
The resting elements, also known as “node”, have two components in each, including the data that is stored there and a link leading to the following node. Plus, any legal data type can represent that data enclosed.
Have a look at the illustration of this mechanism as shown in the diagram below.
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A linked list in JavaScript will appear like follows:
const list = {
head: {
value: 3
next: {
value: 2
next: {
value: 1
next: {
value: 5
next: {
value: 5
next: null
}
}
}
}
}
};
Types Of Linked Lists
There are three varieties of linked list data structures:
- A doubly linked list: In this one, each node has both a next and a prior pointer.
- A singly linked list: This is the place each node in contains simply the next pointer.
- A circular linked list: This is the one that has a head node and a tail node that points in a circle.
How To Implement A Linked List JS?
You may use JavaScript to implement a linked list by following these 4 simple steps:
- Step 1: Make A Function That Generates New Node Objects.
JavaScript may implement a linked list node by using the following function, which yields an object:
function createNode(value) {
return {
value: value,
next: null,
};
}
That way, whenever a node object is needed, just assign thata createNode() method and pass the required value as an argument:
let newNode = createNode("Goodbye");
console.log(newNode);
// { value: 'Goodbye', next: null }
- Step 2: Add The Appropriate Constructor To The Linkedlist Class.
You should take the following into account when deciding which elements to include towards the end of the list:
- If the list is empty, add a component, and the element will be the head.
- If the list has a value, iterate to the end of the list and add a new entry.
- Step 3: Make The Functions Insert() And Print()
At the specified index, let’s add a new node.
We must first travel to the previous node, split the list into two halves, merge the right side with the new node, and then assign the left in order to put an element in the center.
Let’s check out the following insert() method’s whole source code:
insert(value) {
this.length++;
let newNode = createNode(value);
if (this.tail) {
this.tail.next = newNode;
this.tail = newNode;
return newNode;
}
this.head = this.tail = newNode;
return newNode;
}
- Step 4: To Delete Nodes, Create The Remove() Function.
An element can be eliminated from the list if one of three requirements is met:
- If the index is 0, we take away the head and make the next node the list’s head.
- If the index is between 0 and size-1, we take away the element by using prev and the current node.
- If the index is size-1, we take away the last element from the list and replace it with prev.
For example:
removeFrom(index)
{
if (index < 0 || index >= this.size)
return console.log("Please Enter a valid index");
else {
var curr, prev, it = 0;
curr = this.head;
prev = curr;
// deleting first element
if (index === 0) {
this.head = curr.next;
} else {
// iterate over the list to the
// position to removce an element
while (it < index) {
it++;
prev = curr;
curr = curr.next;
}
// remove the element
prev.next = curr.next;
}
this.size--;
// return the remove element
return curr.element;
}
}
Conclusion
Above is all that you should acquire regarding linked list JS implementation. Hopefully, this post will be of great use to you somehow. If you have any further queries related to creating lists in JavaScript, feel free to leave a comment and let us know. See then!
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