270. Using the catchError Operator

Jul 21, 2026 06:05 · 2:13 · English · Whisper Turbo · 2 স্পিকার
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0:02
S… Speaker 2 (270. Using the catchError Operator)
No matter how you handle your error,
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S… Speaker 2 (270. Using the catchError Operator)
what can be useful is a special operator that can
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S… Speaker 2 (270. Using the catchError Operator)
assist you with handling errors.
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S… Speaker 2 (270. Using the catchError Operator)
And that special operator needs to be imported from rxjs
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S… Speaker 2 (270. Using the catchError Operator)
operators and it's named catch error and it does exactly what the
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S… Speaker 2 (270. Using the catchError Operator)
name suggests.
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S… Speaker 2 (270. Using the catchError Operator)
Now let's say here,
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S… Speaker 2 (270. Using the catchError Operator)
when we fetch posts where we already pipe some data,
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S… Speaker 2 (270. Using the catchError Operator)
we got an error and we want to handle
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S… Speaker 1 (270. Using the catchError Operator)
that.
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S… Speaker 2 (270. Using the catchError Operator)
Now we can simply add the catch error operator here.
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S… Speaker 2 (270. Using the catchError Operator)
We get our error response in here.
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S… Speaker 2 (270. Using the catchError Operator)
So we get exactly the same data we would get
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S… Speaker 2 (270. Using the catchError Operator)
in that second argument of the subscribe method.
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S… Speaker 2 (270. Using the catchError Operator)
And in here,
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S… Speaker 2 (270. Using the catchError Operator)
you could now do stuff like send to analytics server
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S… Speaker 2 (270. Using the catchError Operator)
or anything like that.
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S… Speaker 2 (270. Using the catchError Operator)
So some generic error handling task you might wanna do.
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S… Speaker 2 (270. Using the catchError Operator)
Maybe not related to the UI.
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S… Speaker 2 (270. Using the catchError Operator)
Though of course you could use the subject and next the error message
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S… Speaker 1 (270. Using the catchError Operator)
here too.
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S… Speaker 2 (270. Using the catchError Operator)
But maybe you have some behind the scenes stuff you want to do when an error occurs.
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S… Speaker 2 (270. Using the catchError Operator)
Log it somewhere,
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S… Speaker 2 (270. Using the catchError Operator)
send it to your own server,
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S… Speaker 2 (270. Using the catchError Operator)
your analytics server,
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S… Speaker 2 (270. Using the catchError Operator)
anything like that.
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S… Speaker 2 (270. Using the catchError Operator)
And once you're done handling that error,
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S… Speaker 2 (270. Using the catchError Operator)
you should pass it on though.
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S… Speaker 2 (270. Using the catchError Operator)
It definitely needs to be able to reach subscribe.
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S… Speaker 2 (270. Using the catchError Operator)
Just as you need to pass something here in map as well.
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S… Speaker 2 (270. Using the catchError Operator)
So we also now need to create a new
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S… Speaker 2 (270. Using the catchError Operator)
observable that wraps that error.
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S… Speaker 2 (270. Using the catchError Operator)
And for that,
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S… Speaker 2 (270. Using the catchError Operator)
you can import something from RxJS and that something is throw
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S… Speaker 1 (270. Using the catchError Operator)
error.
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S… Speaker 2 (270. Using the catchError Operator)
And that is a function that will yield a new observable and
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S… Speaker 2 (270. Using the catchError Operator)
it yields a new observable by wrapping an error.
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S… Speaker 2 (270. Using the catchError Operator)
So here we can now throw the...
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S… Speaker 2 (270. Using the catchError Operator)
Error response,
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S… Speaker 2 (270. Using the catchError Operator)
you could also throw a new custom error which you generated whatever
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S… Speaker 1 (270. Using the catchError Operator)
you want.
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S… Speaker 1 (270. Using the catchError Operator)
Important,
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S… Speaker 2 (270. Using the catchError Operator)
you need to return that observable which is created by throw
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S… Speaker 1 (270. Using the catchError Operator)
error.
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S… Speaker 2 (270. Using the catchError Operator)
And now with that,
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S… Speaker 2 (270. Using the catchError Operator)
this of course doesn't do anything useful here,
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S… Speaker 2 (270. Using the catchError Operator)
but it's just an idea that you could consider using catch
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S… Speaker 2 (270. Using the catchError Operator)
error if you have some generic error handling task you also
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S… Speaker 2 (270. Using the catchError Operator)
wanna execute.

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