Queue

by Nidhi Patel

JavaScript

class Node {
  constructor(value) {
    this.value = value;
    this.next = null;
  }
}
class Queue {
  constructor(value) {
    this.first = null,
      this.second = null;
    this.length = 0;
  }
  peek() {
    return this.first;
  }
  enqueue(value) {
    const queueNode = new Node(value);
    if (this.length === 0) {
      this.first = queueNode
      this.second = queueNode
    } else {
    	this.second.next = queueNode;
      this.second = queueNode
    }
    this.length++;
    return this;
  }
  dequeue() {
  if(!this.first){
  return null;
  }
  if (this.length === 1) {
   	this.last = null;
  } 
	this.first = this.first.next;
  this.length--;
  
  return this;
  }
}


const queue = new Queue();
queue.enqueue('Nidhi');
queue.enqueue('bhai');
queue.enqueue('Rutu');
console.log(queue);
queue.dequeue();
console.log(queue);