code: func (list *SkipList) GetValue(key interface{}) (interface{}, bool) {
  	element := list.Get(key)
  
  	if element == nil {
  		return nil, false
  	}
  
  	return element.Value, true
  }
docs: // Gets a value. It's a short hand for Get().Value.
  // Returns value and its existence status.