Your Undo Button is Just a Stack of Pancakes

TL;DR: I implement undo functionality using a Stack data structure because it follows the Last-In-First-Out (LIFO) principle. Each state change is pushed onto the stack. When I trigger an undo, I pop the most recent action, reverting the application state in O(1) time without the overhead of re-indexing an entire array. I see developers treat the undo button like a magic time-travel feature, but it’s actually just basic application of stack logic. If I try to track user history with a standard list, I’m setting myself up for index management headaches and unnecessary O(n) operations. In my experience, if you aren't using a stack to manage your undo buffer, you're essentially building a performance bottleneck by design. Why is the undo function always a Stack? I use a stack because it enforces a strict linear history where the only accessible element is the most recent one. This ensures that every undo call reverses the exact last action performed, preventing state corruption and keepin