Rx.Observable.for(sources, resultSelector, [thisArg])

Concatenates the observable sequences or Promises obtained by running the specified result selector for each element in source. There is an alias for this method called forIn for browsers <IE9


  1. sources (Array): An array of values to turn into an observable sequence.
  2. resultSelector (Function): A function to apply to each item in the sources array to turn it into an observable sequence. The resultSelector is called with the following information:

    1. the value of the element
    2. the index of the element
    3. the Observable object being subscribed
  3. [thisArg] (Any): Object to use as this when executing resultSelector.


(Observable): An observable sequence from the concatenated observable sequences or Promises.


Using Observables

Using Promises