Design a singly linked list https://neetcode.io/problems/singlyLinkedList

linkedlist.js

class Node {
    constructor(value, next) {
        this.value = value;
        this.next = next;
    }
}

class LinkedList {
    constructor() {
        this.head = null;
    }

    /**
     * @param {number} index
     * @return {number}
     */
    get(index) {
        let i = 0;
        let current = this.head;

        while (i++ < index && current) {
            current = current.next;
        }

        return current ? current.value : -1;
    }

    /**
     * @param {number} val
     * @return {void}
     */
    insertHead(val) {
        const node = new Node(val, this.head);
        this.head = node;
    }

    /**
     * @param {number} val
     * @return {void}
     */
    insertTail(val) {
        let current = this.head;
        if (!current) {
            this.head = new Node(val);
        }
        else {
            while (current.next) {
                current = current.next;
            }

            current.next = new Node(val);
        }
    }

    /**
     * @param {number} index
     * @return {boolean}
     */
    remove(index) {
        let i = 0;
        let current = this.head;
        let parent = null;

        while (i++ < index && current) {
            parent = current;
            current = current.next;
        }

        if (current) {
            if (parent) {
                parent.next = current.next;
            }
            else {
                // Removing the head.
                this.head = this.head.next;
            }
        }

        return current ? true : false;
    }

    /**
     * @return {number[]}
     */
    getValues() {
        const values = [];
        
        let current = this.head;
        while (current) {
            values.push(current.value);
            current = current.next;
        }

        return values;
    }
}