linked list implementation of queue

app.js

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

class Queue {
    constructor(){
        this.first = null;
        this.last = null;
        this.size = 0;
    }
  
    //newnode goes to back of the line/end of the queue
    enqueue(value){
        const newNode = new Node(value);
        //if queue is empty
        if (this.size === 0) {
          this.first = newNode;
          this.last = newNode;
          // add current first pointer to new first(new node), and make new node new first
        } else {
          this.last.next = newNode;
          this.last = newNode;
        }
        //add 1 to size
        this.size++;

        return this;
    }
  
    // dequeue nodes off the front of the line
    dequeue(){
         //if queue is empty return false
        if (this.size === 0) return false;
        //get dequeuednode
        const dequeuedNode = this.first;
        //get new first (could be NULL if stack is length 1)
        const newFirst = this.first.next;
        //if newFirst is null, reassign last to newFirst(null)
        if (!newFirst) {
            this.last = newFirst;
        }
        //assign new first
        this.first = newFirst;
        //remove reference to list
        dequeuedNode.next = null;
        //remove 1 from size
        this.size--;
        //return dequeuednode
        return dequeuedNode;
    }

    log(){
        let currentNode = this.first
        let i = 0;
        while(currentNode){
           console.log(i, currentNode.value)
           i++;
           currentNode = currentNode.next
        }
    }
 }

 const printQueue = new Queue();

 printQueue.enqueue("Data_Report.csv");
 printQueue.log()
 //["Resume.docx", "Data_Report.csv"]

 printQueue.enqueue("Picture_of_Biscuit.png");
 printQueue.log()
 //["Resume.docx", "Data_Report.csv", "Picture_of_Biscuit.png"]

 printQueue.dequeue();
 //"Resume.docx"
 printQueue.log()
 //["Data_Report.csv","Picture_of_Biscuit.png"]

 printQueue.dequeue();
 //"Data_report.csv"
 printQueue.log()