The Angular MergeMap maps each value from the source observable into an inner observable, subscribes to it, and then starts emitting the values from it replacing the original value. It creates a new inner observable for every value it receives from the Source. Unlike SwitchMap, MergeMap does not cancel any of its inner observables. It merges the values from all of its inner observables and emits the values back into the stream.
The Angular SwitchMap maps each value from the source observable into an inner observable, subscribes to it, and then starts emitting the values from it. It creates a new inner observable for every value it receives from the Source. Whenever it creates a new inner observable it unsubscribes from all the previously created inner observables. Basically it switches to the newest observable discarding all other.
ThrowError Angular Tutorial ReTry & ReTryWhen Angular CatchError is an RxJs Operator. We can use it to handle the errors thrown by the Angular Observable. Like all other RxJs operators, the CatchError also takes an observable as input and returns an observable (or throws an error). We can use CatchError to provide a replacement
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The Angular observable Map operator takes an observable source as input. It applies a project function to each of the values emitted by that observable and transforms it into a new value. It then returns a new observable with the transformed values. The Map operator is pretty simple to use and is the most common operator that we use in Angular. We use a Map with a Pipe, which allows us to run multiple operators. You can also use Pipe to run multiple Map functions. In this guide, we’re going to learn how to use the Map operator with examples.
The pipe method of the Angular Observable is used to chain multiple operators together. We can use the pipe as a standalone method, which helps us to reuse it at multiple places or as an instance method. In this tutorial, we will take a look at the pipe and learn how to use it in an Angular Application.
