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Instructor: Now that we've got our project installed

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and we've got our dependencies installed,

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and on top of that, we've got a better idea

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of what higher order components are

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and what we're gonna use them for

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in this particular project,

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let's get started with some real development.

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Now, in this project we're gonna go ahead

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and make use of React Router.

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And so just like in the last section

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where it was kind of assumed

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that you knew what was going on with React

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and what was going on with Redux,

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I'm also going to assume inside of this section

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that you're going to know

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what's going on with React Router as well.

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So if you're not familiar with React Router,

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I advise you to look up the documentation

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a little bit, and what have you.

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I've got another course that includes React Router

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if you want to go learn it from scratch.

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Otherwise, we're really gonna dive in headfirst here.

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So thinking back to the mockup

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that we were looking at of our application,

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we had three buttons up at the top,

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and then we had kind of a body to the document as well.

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So let's start by working on the header of sorts.

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The header is gonna have our three buttons up on the top,

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the home route, a link to the home route,

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a link to the resources route,

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and then a button to toggle the login state

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so the user can either set themselves

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as being logged in or not.

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So this is definitely gonna be a component

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that we're gonna create inside

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of our source components directory.

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I'm gonna make a new file and I'm gonna call it header.

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Now, as I've said several times,

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we're really focused more on the

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higher order component side,

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so as we're putting this component together,

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we're gonna kind of just speed

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through things a little bit here.

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I'm gonna import React and Component up at the top,

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and then we'll make a class header.

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And this header is going to have

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several elements inside of it.

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It'll have

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a parent nav of sorts

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and we're gonna be making use of some bootstrap classes

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just to make things look nice.

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So our nav will have className navbar and navbar-light.

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And then inside of the nav we're going to have

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an unordered list, className nav navbar-nav.

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What a goofy class name that is.

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You'd think that they could just reduce it down

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to just be nav.

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I don't know what navbar-nav is supposed to be,

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but that's a complaint for another day.

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So we'll show a class name on an li of nav-item.

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So this is gonna represent a single clickable thing

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that the user can click on.

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And we're gonna end up having three of these things,

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one for each of our buttons.

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The first one is gonna be a link to the homepage,

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which will be our unauthenticated route.

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The second one is gonna be a link to the protected route,

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the resources route of sorts.

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And the final one is gonna be for our actual login button.

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So it'll have a button that says

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log in, or log out, or what have you.

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It also looks like I made a little bit of a typo here.

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Be aware of it.

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I did not close the li tags.

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So I'm gonna just put on a closing one like so.

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It should be normal jsx.

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Opening and closing tag underneath it.

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So we're going to assume that we're going to have

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link tags to each of our different routes.

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Remember, link tags are a part of React Router.

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A link tag is a component that we import from React Router,

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and whenever we place one down,

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when it actually gets rendered onto the page,

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it's gonna show up as an anchored tag.

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So we'll put a link to forward-slash.

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So this will be our homepage.

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And we'll put text "home."

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We'll have a link to...

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Now this is the protected route here.

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This is the one that we're going to want to say,

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"Hey, if you're trying to visit this

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"and you're not authenticated, I'm gonna boot you out.

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"You're gonna go back to the home route."

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So on this one, the path doesn't necessarily matter,

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but we're gonna come up with a

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at least somewhat meaningful route name here.

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So we'll call it resources.

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And so again, resources is gonna be our protected route.

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If someone tries to go to slash-resources

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and they aren't authenticated,

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we're gonna kick them back to the home screen,

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which is just forward-slash.

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And then the text for this one

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we'll say is just "resources."

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And finally, at the bottom we'll say this.authButton.

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So we'll make a helper method to render our authButton.

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And the reasons for that will be clear very shortly.

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For right now, let's just go ahead

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and show a single button on the screen.

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So we'll just say "button,"

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and we'll say "sign in."

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So by default right now,

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the button's always gonna say "sign in,"

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but later on we'll give it a little bit more interaction.

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We'll give users the ability to kind of toggle

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between the sign-in and sign-out states.

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So at the bottom, one more step:

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we will export default header.

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All right, so this works for our header right now.

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Pretty straightforward.

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Just show a header, three links at the top.

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Let's make sure that this header is always visible

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no matter what route the user is on.

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Now, to make sure that it's visible

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no matter what route the user's on,

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we're going to go back into app.js,

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and we'll say that app.js should show the header.

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So we'll import Header from header.

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I'm gonna remove the text that's already in here,

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and we'll just show header.

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Always show the header inside of our app.

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So I would love to do a quick test of this in the browser,

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make sure that everything is working.

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So I'm going to flip over to my terminal: npm run start.

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Looks like I've already got my server running here.

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Just make sure that you're running yours as well.

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And then I should be able to pick up my browser,

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go to localhost:8080, and at the top,

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I'll see home, resources, and sign in.

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Perfect. Just what we want for right now.

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So this is really gonna form kind of

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the backbone of our application right here,

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at least on the Vue side.

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The only other big things we have to do

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are create the kind of protected resources route.

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We need to implement the idea

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of signing in and signing out.

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And then we'll focus on the higher-order component.

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So we're still gonna do a

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little bit more setup inside this app

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until we get to the higher-order component part,

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but as we're going through the app setup,

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at least it's a good review of React Router

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and a little bit of Redux in there as well.

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So let's continue with the baseline setup of this app

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inside the next section.