118. [OPTIONAL] Assignment Solution

Jul 15, 2026 04:43 · 9:37 · English · Whisper Turbo · 1 स्पीकर

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वाचन अनुक्रमणिकाName

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So, were you successful?

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Here's my solution.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I would create this user's service as we are asked

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to. And in there,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

we of course export a class,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the user's service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

We don't need to add add injectable right now because right now we're

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

not injecting a service in there.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And here I now want to manage my users.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now you could create one array of users and their store

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

objects,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

which for each object also tracks the state of the user.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I will go with two arrays.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So I will have my active and my inactive users,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the two arrays from the app component.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So I'll copy it from there and paste it into my user service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

But again, as an improvement,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

you could store objects in one single.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

array there,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

which then allows you to switch the status for each object,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

for each user.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So this is this.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And then I want to add a setToActive method.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Here I expect to get the ID of the element

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I should switch and a setToInactive method.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And here, of course,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

also you could optimize this by having one method which does both and which

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

receives an additional argument which determines whether you want to switch active

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to inactive or the other way around.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Well,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

in setToActive,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I want to reach out to my active users and push a

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

new element to them.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

That new element is in my inactive users,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the user with the ID I'm receiving there.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And thereafter,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I can simply splice that user.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Splice will simply remove this one element in this case here.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Well,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

now I can copy that code,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

paste it in here and reverse it.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

push it to the inactive users,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

from the active users and splice it from the active users.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now this service is prepared.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And now in my app component,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I can get rid of these two methods.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I also can delete my users here.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So we can completely clean this component and we can clean everything

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

in the template of the app component.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

We don't need to pass the properties to our components there because

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

these components can reach out to the service on their own.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now, it is important to make sure that we provide the service on

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the right level.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

If we would provide it in the inactive user component and the active

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

user component,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

we would have two different instances of that service and therefore

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

it would not work.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

We could not switch because we would work with two different arrays.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So with four different arrays actually.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So therefore,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

this is not the right place to provide it.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

We could provide it here in the app component or in the app module.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now, since we don't plan on injecting this service in another service

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

or something like this,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

there is no reason to provide it application -wide,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

though you could do that.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

That's not wrong,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

not bad.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

But I will simply provide it here in the app component.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

But again, just to highlight this,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

it's not bad or wrong to provide it in the app module.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So here I will provide my users service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Make sure to also add the import.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

With that provided on this level,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

active users and inactive users will actually share the same service,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the same instance of the service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So now I can go to inactive users,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

add a constructor here and get my users

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

service here.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So of type users service,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

of course, user service is the name actually.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

make sure to add the import here too.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

You always need to add this.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

That's a TypeScript feature,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

not related to Angular.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And then I can remove the input here.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

We're not receiving it from outside anymore.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I can remove my whole output,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

my whole event here.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And also remove this where I emit it.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Remove all these imports therefore.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And now I want to initialize my user's array.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

i will do it on init as again it is a good practice to do initialization

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

work in there so let's implement on in it make sure to import it and

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

then we need to add the ng on in that method and in there i can set my users

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

equal to the users i fetched from my user service and

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

we're in the inactive component here so i should get my inactive users

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now with that,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I can simply copy that code over to the active users,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

replace my input and my output here too,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

and remove the input string,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

remove all these imports,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

but on the other hand,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

make sure to import user service and implement on init.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So just like in the other component,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

make sure to import on init too and import the service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And here we don't have to emit this event anymore.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Instead,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

make sure that now users is not the inactive users,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

but the active users,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

since we're in the active users component.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And if we click on set to inactive,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I want to reach out to the user service and call set

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to inactive and pass on this ID.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And on the other hand,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

in the inactive service,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I want to do the same.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Reach out to the user service and here call set

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to active and pass the ID.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

That should be all.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Let's see if this works.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

If our app here is reloaded,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I can still switch my users around.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So this first part does work,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

but boy,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

is it leaner,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

much less passing around instead having a clean central service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now, the other part of the task was to add this counter service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So let's add this to the counter service dot TS

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

file.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Let's export a class here,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the counter service like this.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And here I simply want to manage my active to inactive

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

counter,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

which starts at zero.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

well, you guessed it,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

inactive to active counter,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

which also starts at zero.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And now I simply want to add two

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

methods where I say...

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

increment active to inactive of

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

course you can choose another name and here I will simply say active to

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

inactive counter plus plus and lock the new counter so the

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

active to inactive counter

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And then I will just duplicate this to also have

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

my inactive to active counter where I

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

increase the inactive to active counter property and lock

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the inactive to active counter property.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

You probably dream about inactive to active this night.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

But this is our counter service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now here...

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

You could add it in multiple places.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

You could add it here in the onsetToActive or the onsetToInactive

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

method.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

That would be all right.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

But I want to add it here in my user service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So I want to inject it into a service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And for this,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

we have to take two things into account.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

First of all,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

we have to make sure that we provide the counter service

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

here in the app module.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So counter service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Make sure to add the import here too.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Now it's available application -wide and therefore can also

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

be injected into other services.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Second,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to inject a service into a service,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

what would you need to do?

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

You need to add add injectable to

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

where you want to inject it in,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

right?

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So to the user's service here,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

not to counter service,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to user service,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to the receiving service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So here I will add add injectable.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Don't forget the parentheses,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

that's a common mistake.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Add the import.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And with that,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

I can now inject the counter service in the

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

user's service.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So here,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

counter.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

whoops counter service of type counter service make

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

sure to import this type here at the top two and with

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

that injected here in set to active I can call this

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

counter service and since we set something to active I want to

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

call the increment inactive to active because

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

we set something from inactive to active and on

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

the other hand in the set to inactive I want to increment the

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Well, active to inactive.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So this one here.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

With that,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

if we now save this and let our app reload and I click to

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

set to inactive,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

we see that is one.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Maybe improve the output here that we say active

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

to inactive and then we output the

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number.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

And on the other hand down here,

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we have inactive

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to active.

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So now let's just reload.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

active to inactive one,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

two,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

and now we should add four to the inactive to active side and

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some to the active to inactive.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

So this is working.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Everything seems to work as intended.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

This is my solution.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Of course, you might have a different solution.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

There are different ways of achieving the same.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Overall,

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

you should feel confident using services now.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

You should see their benefits and how you might use them in your next

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

project.

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S… Speaker 1 (118. [OPTIONAL] Assignment Solution)

Let's move on.

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