Switch map

See also

  • Official ReactiveX documentation: SwitchMap

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element’s index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

Keyword arguments: selector – {Function} A transform function to apply to each source

element; the second parameter of the function represents the index of the source element.

Returns an observable {Observable} sequence whose elements are the result of invoking the transform function on each element of source producing an Observable of Observable sequences and that at any point in time produces the elements of the most recent inner observable sequence that has been received.