Reread the instructions. If you don’t understand them, then do some research.
As a developer, I am googling things all the time. I don’t use hasOwnProperty much so I might have to look it up. I would google “mdn hasOwnProperty”. MDN is a great site with a lot of great documentation. I use it all the time.
If you are still confused, show us what you’ve tried, and be very specific about the problem that you are having.