Can I limit the length of an array in JavaScript?

Question

I want to display the product browsing history, so I am storing the product ids in a browser cookie.

Because the list of history is limited to 5 items, I convert the

Answer 1

var  arrLength = arr.length;
if(arrLength > maxNumber){
    arr.splice( 0, arrLength - maxNumber);
}

This soultion works better in an dynamic environment like p5js. I put this inside the draw call and it clamps the length of the array dynamically.

The problem with:

arr.slice(0,5)

...is that it only takes a fixed number of items off the array per draw frame, which won't be able to keep the array size constant if your user can add multiple items.

The problem with:

if (arr.length > 4) arr.length = 4;

...is that it takes items off the end of the array, so which won't cycle through the array if you are also adding to the end with push().