JSFiddle - React, Tailwind, and code Playground

by Shridhar Baddur

JavaScript

/* 10 --> 5 --> 16 */
class Node {
	constructor(value) {
  	this.value = value;
    this.next = null;
  }
}

class LinkedList {
	
	constructor() {
  	this.head = null;
    this.length = 0;
    this.tail = this.head;
  }
  
  size() {
  	return this.length;
  }
  
  isEmpty() {
  	return this.length === 0 ? true : false;
  }
  
  add(value) {
  	const node = new Node(value);
    
    let current;
    
    if(this.head === null) {
    	this.head = node;
    } else {
    	current = this.head;
      
      while(current.next) {
       	current = current.next;
      }
      current.next = node;
      this.tail = current.next;
    }
    this.length++;
  }

  printList() {
    let current = this.head;
    let str = '';

    if(current === null) 
      console.log('The list is empty')

    while(current) {
      str += current.value;
      if(current.next !== null) {
        str += ' --> ';
      }
      current = current.next;
    }
    console.log(str)
  }

  valueAt(index) {
    if(this.length < index || this.length === 0) {
      console.log('The provided index more than length of the list');
      return;
    }
    
    let current = this.head;
    while(index) {
      current = current.next
      index--;
    }
    return current.value;
  }

  pushFront(value) {
    const newNode = new Node(value);

    newNode.next = this.head;
    this.head = newNode;
    this.length++;
  }

  popFront() {
    const deletedNode = this.head;
    this.head = this.head.next;
    this.length--;
    return deletedNode;
  }

  pushBack(value) {
    this.add(value);
  }

  erase(index) {
    if(this.length === 0 || this.length < index) {
      return console.log('Please provide proper index');
    }

    let pre = this.head;
    for(let i = 0; i < index - 1; i++) {
      pre = pre.next;
    }
    let del = pre.next;
    let aft = del.next;
    console.log(del);

    if(aft === null) {
      this.tail = pre;
    }
    pre.next = aft;
    this.length--;
    return del;
  }

  popBack() {
...