Rx.Observable.forkJoin(...args [resultSelector])
Runs all observable sequences in parallel and collect their last elements.
Arguments
args(Arguments|Array): An array or arguments of Observable sequences or Promises to collect the last elements for.resultSelector: (Function) - The result selector from all the values produced. If not specified,forkJoinwill return the results as an array.
Returns
(Observable): An observable sequence with an array collecting the last elements of all the input sequences or the result of the result selector if specified.