All language subtitles for 006 Adding Conditional Return Statements_en

[Maximilian Schwarzm�ller] Now with

the conditional content covered here,

before we continue,

I wanna restructure the expenses component a little bit.

And I actually wanna extract that list logic

into a new component

to again, make that expenses component a little bit leaner.

Therefore, I'll add a expenses list JS file,

and also expenses list dot CSS file

which you also find attached.

And you can already download my CSS file

and copy the styles into your expenses list CSS file.

In the expenses list JS file,

I will then add a constant expenses list

which receives props and return something.

And of course, we export this expenses list

and we can if we want to also import React from react.

But again, that is optional.

Now you're in expenses list,

I wanna output my expenses list.

I will not filter in there.

I will keep the filtering logic in expenses

since that's also where I managed the filtered year

but I will take this fallback content, this if check,

I will take all of that

and move that into my expenses list component.

That means that we also, of course,

wanna import the expense item

from ./ExpenseItem here

since I'm using that component here.

And the filtered expenses no longer exist here.

I just wanna get, let's say, my items here or expenses.

It's up to you. I'll name it items

as props

like this.

Now in expenses JS,

that, of course, means that here

I now wanna output my expenses list

down there.

And of course, we therefore also wanna import expenses list

from the expenses list file

and we can get rid of the expense item import.

And the filtered expenses should now

be passed to expenses list through the items prop,

which I'm using inside of expenses list.

Like this.

Now inside of the expenses list JS file,

I also want to make a couple of changes now.

Of course, we need to return some JSX

but I want to return an unordered list here

and actually give that list a class name

of expenses-list.

This is a class to find here in my CSS file

and therefore, we also wanna import

this expenses list CSS file into the expenses list JS file.

And instead of this unordered list,

I now wanna output

my map here,

my expense item array.

So we'll again, grab that

and render this dynamically here like this.

And I will handle this if case a little bit differently now.

I will add a if check

but I'll check if props items length is equal to zero.

So if we have no items and if that's the case,

I will simply return a totally different JSX snippet

because that's yet another way

of handling conditional content.

If what your component returns changes entirely

based on different conditions, you can use this approach.

It would have not been appropriate here

in expenses JS before,

because only a part of the JSX snippet,

which we returned changed.

So there, the approach I showed

in the last lecture was better,

but if your entire JSX content changes,

when data is missing,

you can always add a if check where you return

a different JSX block if some condition is met.

And here, I simply want to return an h2 tag

with a class name of expenses-list__ fallback

with a text of found no expenses.

So that's what this component, expenses list, will render

if we got no expenses.

Hence, we can also get rid of that variable here.

And then with that,

we see there's found no expenses text

or the filtered list if we switch.

But now, with help of this extra component,

which uses a different logic for rendering

or for returning different JSX code,

and we now also got a little bit

of a leaner expenses JS file again.

Now one additional tweak, which I want to make here

which I almost forgot is that

since I'm using unordered list here now

for semantic reasons in the expense item component,

I actually wanna switch away

from having a div being rendered to a list item instead.

So I will just wrap this entire card here

with a list item

and visually this doesn't change anything

but semantically this is a little bit better.

So that's just another tiny tweak

which I wanted to make here.