JavaScript Exercises: Remove a node at the specified index in a singly linked list

JavaScript Singly Linked List: Exercise-11 with Solution

Write a JavaScript program that removes the node from the singly linked list at the specified index.

Sample Solution:

JavaScript Code:

class Node {
    constructor(data) {
        this.data = data
        this.next = null                
    }
}
class SinglyLinkedList {
    constructor(Head = null) {
        this.Head = Head
    }
add(newNode){
    let node = this.Head;
    if(node==null){
        this.Head = newNode;
        return;
    }
    while (node.next) {
        node = node.next;
    }
    node.next = newNode;
}
 removeAt(index_pos){
    let nodes = this.Head;
    if(index_pos===0) {
        if(nodes!==null)
        {
            nodes = nodes.next;
            this.Head = nodes;
        }
        else
            throw Error("Index Out of Bound");

        return;
    }
    while(--index_pos){
        if(nodes.next!==null)
            nodes = nodes.next;
        else
            throw Error("Index Out of Bound");
    }
    nodes.next = nodes.next.next;
}  
 displayList(){
    let node = this.Head;
    var str = ""
    while (node) {
        str += node.data + "->";
        node = node.next;
    }
    str += "NULL"
    console.log(str);  
  }
}
let numList = new SinglyLinkedList();
numList.add(new Node(12));
numList.add(new Node(13));
numList.add(new Node(14));
numList.add(new Node(15));
numList.add(new Node(14));
numList.displayList();
console.log("Remove the node where index position is 0:")
numList.removeAt(0)
numList.displayList();
console.log("Remove the node where index position is 3:")
numList.removeAt(3)
numList.displayList();
console.log("Remove the node where index position is 2:")
numList.removeAt(2)
numList.displayList();

Sample Output:

12->13->14->15->14->NULL
Remove the node where index position is 0:
13->14->15->14->NULL
Remove the node where index position is 3:
13->14->15->NULL
Remove the node where index position is 2:
13->14->NULL

Flowchart:

Live Demo:

See the Pen javascript-singly-linked-list-exercise-11 by w3resource (@w3resource) on CodePen.

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