What about external libraries? While it might be a good idea to stop using null in your own code, you should probably still make it a habit to check for both nu

What about external libraries? While it might be a good idea to stop using null in your own code, you should probably still make it a habit to check for both null and undefined to avoid problems with external code. > we cannot remove null from JavaScript, but we can pretend it doesn't exist Even if it does become general convention to not use null, as a developer, you cannot depend on that convention and skip null checks in favor of undefined, because null is deeply engrained into the language itself. So... we can't really pretend that it doesn't exist