Medium - DS in Javascript - Queue - Length Method

queue.js

function Queue() {
  this.values = [];
  this.count = 0;
}

Queue.prototype.enqueue = (newValue) => {
  this.values[this.count] = newValue;
  this.count++;
}

Queue.prototype.dequeue = () => {
  if (this.count === 0) {
    return null;
  }
  
  const value = this.values[0]; 
  const arrayAfterDeletion = this.values.slice(1, this.count - 1); 
  
  this.values = [...arrayAfterDeletion];
  
  return value;
}

Queue.prototype.length = () => {
  return this.count; // Return the count, which holds the length of the Queue.
}