Unlimited queue

UnlimitedQueue.js

class UnlimitedQueue {
  constructor() {
    this.queueArray = [];
  }

  enqueue(val) {

    // Create new queue if there is no available queue
    if (this.queueArray.length === 0 ||
      this.queueArray[this.queueArray.length - 1].length === 5) {
      this.queueArray.push(new Queue());
    }

    this.queueArray[this.queueArray.length - 1].array.push(val);
  }

  dequeue( ) {
    if( this.queueArray.length === 0 )
      return false;

    let result = this.queueArray[0].array.shift();

    if( this.queueArray[0] === 0)
      this.queueArray.shift();

    return result;
  }
}

class Queue {
  constructor() {
    this.size = 5;
    this.array = [];
    this.front = 0;
    this.rear = 0;
  }

  push(val) {
    if(this.isFull())
      return false;

    if(this.rear === this.size)
      this.rear = 0;
    else {
      this.array[this.rear] = val;
      this.rear++;
    }
  }

  pop() {
    if(this.isEmpty())
      return false;

    if(this.front === this.size)
      this.front = 0;
    else {
      this.array[this.rear] = 0;
      this.front++;
    }
  }

  isEmpty() {
    return this.front === this.rear;
  }

  isFull() {
    if(this.front < this.rear)
      return (this.rear - this.front) === this.size;
    else
      return this.front + 1 === this.rear;
  }

  peek() {
    return this.array[this.front];
  }
}

let myQ = new UnlimitedQueue();

You cannot use this.queueArray as all the arrays are limited to the length of 5. Make it to be a linked list.