JS Practice — Built-in Objects

Array.prototype.pop() — implement a stack pop

📖 Usage Example

const stack = []
stack.push(1)
stack.push(2)
stack.pop()   // → 2  (LIFO)
stack.pop()   // → 1

Use push() and pop() together to implement a last-in, first-out (LIFO) stack.

Array.prototype.pop() — stack data structure

Arrays in JavaScript naturally model a stack (LIFO — last in, first out). push adds to the top; pop removes from the top. This is the classic stack-pop operation.

Challenge: Implement stackPop(stack) — a named stack-pop function that removes and returns the top element of the stack.

stackPop([1, 2, 3]) // → 3  (stack is now [1, 2])
stackPop([99])      // → 99 (stack is now [])

💡 Hints (2)

• A stack's "top" is the last element of the array.
• `pop()` is the natural implementation of a stack pop — O(1) and mutation-based.