ConcatMap
Map values to inner observable, subscribe, and emit in order. Projects each source value to an Observable which is merged in the output Observable, in a serialized fashion waiting for each one to complete before merging the next.
Returns an Observable that emits items based on applying a function that you supply to each item emitted by the source Observable, where that function returns a (so-called "inner") Observable. Each new inner Observable is concatenated with the previous inner Observable.
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