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Instructor: In the last section, we wrapped up our tests

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around the comment box component.

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Now, rather than moving on to the comment list component

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we're going to instead do a little bit of a pivot

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and start setting up redux inside of our application.

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We'll start wiring up redux.

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We'll set up our reducer and our action creator

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and then we'll come back to the comment list.

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The reason that we're taking this detour

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is that the comment list is really dependent upon

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accessing our list of comments out of the redux state.

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So I think that we really need to work

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on that side of things

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before we put together the comment list.

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So with that in mind

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we're gonna flip back over to our code editor

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and start working on our redux side of things.

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I'll first get started inside my SRC directory

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by creating a new folder

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that's going to house all of our reducers.

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In this case, we just have one reducer

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but we're gonna make it anyways.

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So in the SRC directory

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I'll make a new folder called reducers.

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And then inside that folder

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I'm gonna create two separate files.

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One file is going to contain our comments reducer

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so I'll call it simply comments dot js.

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And then the other file that we're gonna create

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still inside the same directory will be index dot js

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and this is going to house our combined reducers call.

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Remember, combined reducers takes multiple reducers

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and combine some altogether into a single object.

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Okay, so let's first get started

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inside of our comments dot js file.

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So the idea behind this first reducer,

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oh, let's pull up a quick diagram here.

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Where is it?

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Here we go.

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So for this single reducer that we're going to have

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our intent is to return an array of strings.

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Each string is going to represent a comment

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that needs to be rendered out on the screen.

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For right now,

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we'll put together just kind of the skeleton of our reducer,

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and we'll come back later to it once we have a better idea

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of exactly how this action created down here

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is going to work as well.

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And we'll make some changes to the reducer.

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So for right now, just a little bit of boiler plate.

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So in my reducer comments dot js file

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I will create an export a function.

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So we'll say export default function.

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This function is going to be called with a first argument

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of our initial state,

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which be of our state produced by the reducer,

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and then a second argument of the action.

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And inside of here, we'll put down our switch statement.

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We're gonna look at the action type,

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and eventually we'll come back

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and add some different types to this reducer.

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But for right now, we'll have just one single case

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which is the default case.

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So in this case, we're just going to return

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whatever state we got passed.

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Now the last thing we need to take care of here

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is to make sure that we initialize our reducer

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with some initial state, which we can easily do

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by setting a default argument

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for our first argument right here or default value.

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So we'll default our state to be an empty array

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because eventually we're going to want to return

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an array of comments.

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Okay, so that's it.

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That's all we have to do inside this reducer for now.

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We'll come back in just a little bit

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and add an actual type to it.

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We'll now flip over to our index dot js file

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where we will import that reducer we just created

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and add it to a combined reducers call.

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So I'm going to import combined reducers from redux

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and comments reducer from reducers comments.

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On combined reducers right here,

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remember that the Redux Library

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exports many different functions.

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So we are using the curly braces to specifically get access

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to just the combined reducers function.

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Then underneath those imports

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we will combine all those reducers together

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or in this case, just the one I suppose

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and export it right away.

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So I'll say export default, combine reducers.

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We'll say that our state object

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will have a single key of comments

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and that's going to be where our list of comments exists.

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So I'll say comments is, comments reducer.

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All right, so that's it.

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That's all we need to do right now for our reducer setup.

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Now, in the next section,

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we'll come back and start setting up redux

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inside of our index dot js file

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and make sure that the redux side of things

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gets included over

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to the react side of our application as well.

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So quick break and I'll see you in just a minute.