The time complexity of dequeue in this snippet is O(n), while if it were implemented correctly it would be O(1). A queue is usually implemented using a singly linked list and not an array.

I feel like this examples illustrates the dangers of vibe coding best. This code will not throw an error, it will run just fine and there is nothing that will make someone who does not know better look twice, but it will cost you.

besides the obvious ai smell of having comments that describe what's obvious by just reading the code, and no checking of anything whatsoever, it's not implementing a queue in any way, that's just an array with extra steps, it loses all the benefits of a real queue.

It probably stole that code from someone who doesn't understand data types either.

A queue has a pointer to a start and end; it has a limited size, and depending on the implementation and what you're trying to achieve it should either circularly wrap if it achieves the size limit, or it should throw an error.

Enqueuing and dequeueing should be constant time (O(1)), that means that adding and removing elements should always take around the same time.

Arrays wrappers like what chatgpt there created get progressively slower over time, as they work in linear time (O(n)).