Method Pop

stack.go:124–148

Pop removes the next item in the stack and returns it.

()

// Pop removes the next item in the stack and returns it.
func (s *Stack) Pop() (*Item, error) {
	s.Lock()
	defer s.Unlock()

	// Check if stack is closed.
	if !s.isOpen {
		return nil, ErrDBClosed
	}

	// Try to get the next item in the stack.
	item, err := s.getItemByID(s.head)
	if err != nil {
		return nil, err
	}

	// Remove this item from the stack.
	if err := s.db.Delete(item.Key, nil); err != nil {
		return nil, err
	}

	// Decrement head position.
	s.head--

	return item, nil
}

// Peek returns the next item in the stack without removing it.
func (s *Stack) Peek() (*Item, error) {