title: Client Side Cart: Adding two items with same description in array
body: <p>Hello i am building a cart using local storage i have soo far been able to add and remove items in the cart now what i want to do now is this:</p>
  
  <p>When a user adds an item that already exists in the cart array the quantity property alone is updated instead of adding another separate item to the cart array, is there an array function that does this already?</p>