docstr: returns the current top element of the stack.
docstr_tok: ["returns","the","current","top","element","of","the","stack","."]
code: def peek(self):
      """returns the current top element of the stack."""
      if self.is_empty():
          raise IndexError("Stack is empty")
      return self._array[self._top]
  
imports: from abc import ABCMeta, abstractmethod
label_desc: Use image node_id 5 for calling the ArrayStack obj's underlying member method code with example usage: obj.peek() and returns: self