Queues(LinkedList)

class Node{
    constructor(value){
        this.data = value; 
        this.next = null;
    }
}
class Queue{
    constructor(){
        this.front = null; 
        this.rear  = null; 
        this.length = 0; 
    }
    enqueue(value)
    {
        let newNode = new Node(value);
        if(this.rear==null)
        {
            this.rear = newNode; 
            this.front = newNode; 
        }
        else
        {
           this.rear.next = newNode; 
           this.rear = newNode; 
        }
        this.length++;
    }
    dequeue()
    {
        if(this.front==null)console.log('empty queue');
        let temp = this.front; 
        this.front = temp.next; 
        let value = temp.data; 
        temp = null; 
        return value; 
        
    }
    peek(){
        return this.front.data; 
    }
    isEmpty(){
        return this.front==null; 
    }
}
let line = new Queue(); 
line.enqueue('Josh');
line.enqueue('Rahul');
line.enqueue('Swathi');
line.enqueue('Raja');
console.log(line.dequeue());
console.log(line.peek());