JavaScript Stack Reverse

You may often encounter situations where you need to reverse the elements in a JavaScript stack. In this article, we will explore different approaches to achieving this goal.

Using an Array

One way to reverse a stack is to use an array. We can create an empty array and push the elements from the original stack into it, one by one. Finally, we can pop the elements from the new array back into the original stack, reversing their order.

function reverseStack(stack) {
  const array = [];
  while (!stack.isEmpty()) {
    array.push(stack.pop());
  }
  while (array.length > 0) {
    stack.push(array.pop());
  }
  return stack;
}

Using Recursion

Another approach is to use recursion. We can recursively pop the elements from the top of the original stack and push them onto a temporary stack. Once the original stack is empty, we can recursively pop the elements from the temporary stack and push them back onto the original stack, effectively reversing their order.

function reverseStack(stack) {
  if (!stack.isEmpty()) {
    const element = stack.pop();
    reverseStack(stack);
    moveElementToBottom(stack, element);
  }
  return stack;
}

function moveElementToBottom(stack, element) {
  if (stack.isEmpty()) {
    stack.push(element);
  } else {
    const top = stack.pop();
    moveElementToBottom(stack, element);
    stack.push(top);
  }
}

Conclusion

Reversing a JavaScript stack can be achieved in different ways, depending on the particular use case. Using an array or recursion are two common approaches that can be adapted to your specific needs.