Show logout in our navbar

- [Voiceover] In this video, we will…show a log out button, instead of…the login button, if we are already logged in.…We can determine if we are logged in…by looking at the localStorage for a token.…But Satellizer makes it easier for us by…providing an isAuthenticated function.…The first thing we need to do is…create a controller for our navView.…Since it didn't have any functionality…until now, it did not need a controller,…but we will now have to check if we…are authenticated to modify what…button we are showing in the navbar.…

So, let's navigate to components, and then navbar.…And now let's create a new file.…We'll call it navbar.controller.js.…And now let's export a class called NavbarController.…And next, let's create a constructor.…And we'll inject the auth service…so that we have access to Satellizer.…And as usual, we'll use ngInject,…since we are injecting a service.…

Now, let's open up our navbar.html.…Inside here, we can add an ngController directive,…since we won't be setting up the controller…with our router, as we did for the other views.…