Removing specific item from an array without splice

I have an unordered ever-changing array that looks something like this:

12,23,1,4,11

I just want to basically tell the code to remove a specific item, let’s say “23”. But since the array is constantly changing length, I can’t use splice.

I also can’t have any gaps, such as “12,1,4,11”. It must return “12,1,4,11”.

And on a related note, can I then check if this array has the same content of numbers as another array (and do I have to put them both in numeric order before it can perform the check, or doesn’t it matter that they’re not in the same order, as long as they have the same contents)?

Any help would be much appreciated.