concatMapObserver | selectConcatObserver

Projects each notification of an observable sequence to an observable sequence and concats the resulting observable sequences into one observable sequence.

Arguments

1. onNext (Function): A transform function to apply to each element. The selector is called with the following information:

   1. the value of the element

   2. the index of the element

2. onError (Function): A transform function to apply when an error occurs in the source sequence.

3. onCompleted (Function): A transform function to apply when the end of the source sequence is reached.

4. [thisArg] (Any): Object to use as this when executing the transform functions.

Returns

(Observable): An observable sequence whose elements are the result of invoking the one-to-many transform function corresponding to each notification in the input sequence.

Example