261. Using RxJS Operators to Transform Response Data

Jul 21, 2026 06:00 · 3:59 · English · Whisper Turbo · 2 Munyori

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Lecture Index

0:02

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

Transforming data is of course something we could also do here inside

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

of subscribe and that would generally not be a problem.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

But it is a good practice to use observable operators because

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

it simply allows us to write cleaner code with different steps we funnel

0:17

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

our data through that can easily be swapped or adjusted so that you

0:21

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

have a lean subscribe function here and have other steps that focus

0:25

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

on other parts.

0:27

S… Speaker 2 (261. Using RxJS Operators to Transform Response Data)

Therefore,

0:28

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

here before we subscribe,

0:29

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

we can now call pipe because pipe as you learned is a method that

0:33

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

allows you to funnel your observable data through

0:37

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

multiple operators before they reach the subscribe method.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

Now the operator I need here is the map operator and

0:45

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

therefore I will import map

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

from rx .js slash operators.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

The map operator allows us to get some data and

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

return new data,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

which is then automatically rewrapped into an observable so that we can

1:00

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

still subscribe to it.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

If it would not be wrapped into an observable again,

1:04

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

we could not subscribe.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

So let's map here,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

let's add map as an argument to pipe and map is a function which

1:11

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

we call and that function now again takes another function as an input,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

a function which will get our response data and that

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

should now return the converted response data.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

And here the idea is that we return an array of posts

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

instead of an object with that cryptic key,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

which then holds our actual post.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

Now to convert a JavaScript object,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

which we have here to an array,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

we have to manually loop through

1:40

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

all the keys and create a new array.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

So here I'll create a new post array constant,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

which is empty initially.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

And then I'll use a for in loop to go through all my

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

keys in response data,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

which I know will be an object.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

And then I want to push each piece of data

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

into my post array.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

So here I will then use posts array and push

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

response data key.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

So I'm accessing the key we're currently looking at in response data and

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

therefore I'm accessing the nested JavaScript object and

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

then pushing that nested JavaScript object into my posts

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

array.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

However, I don't just want to push that object like this in there.

2:30

S… Speaker 2 (261. Using RxJS Operators to Transform Response Data)

Instead,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

I want to push a new object in there.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

So let me add curly braces.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

And let's use the spread operator now.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

This will pull out all the key value pairs of that nested

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

object we're accessing here.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

And let's close this with curly braces too.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

Because this now allows me to also add one new

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

key value pair to that object we're adding to posts array and

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

that should be an ID field which actually stores the key because that

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

key here, that cryptic string is a perfect ID and it is a unique ID

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

generated by Firebase.

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S… Speaker 2 (261. Using RxJS Operators to Transform Response Data)

Therefore,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

of course, I want to keep that so that we have this,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

for example,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

if we wanted to delete a single post or anything like that.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

So now we're pushing this new object into our posts array here.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

Now it is a good practice to wrap this with a if statement if you're using

3:19

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

a for in loop where you check if response data has

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key as its own property so that you're not trying to

3:27

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

access the property of some prototype.

3:30

S… Speaker 2 (261. Using RxJS Operators to Transform Response Data)

And with that,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

posts here now really is an array of posts.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

And now we only need to make sure that we return posts array here

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in map so that this is now forwarded to our subscribe

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

function.

3:43

S… Speaker 2 (261. Using RxJS Operators to Transform Response Data)

With that,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

if that now reloads,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

indeed here we see we have an array,

3:46

S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

we have square brackets,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

and in there we have an element which has a content,

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

the ID we added and the title.

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

And this is how we use observable operators to transform our

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S… Speaker 1 (261. Using RxJS Operators to Transform Response Data)

data.

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