for.md

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

{% if book.isPdf %}

{% else %}

{% endif %}

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

Arguments

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.

Returns

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

Example

{% if book.isPdf %}

Using Observables

/* Using Observables */
var array = [1, 2, 3];

var source = Rx.Observable.for(
    array,
    x => Rx.Observable.returnValue(x)
);

var subscription = source.subscribe(
  x => console.log(`onNext: ${x}`),
  e => console.log(`onError: ${e}`),
  () => console.log('onCompleted'));

// => onNext: 1
// => onNext: 2
// => onNext: 3
// => onCompleted

Using Promises

/* Using Promises */
var array = [1, 2, 3];

var source = Rx.Observable.for(
    array,
    x => RSVP.Promise.resolve(x)
);

var subscription = source.subscribe(
  x => console.log(`onNext: ${x}`),
  e => console.log(`onError: ${e}`),
  () => console.log('onCompleted'));

// => onNext: 1
// => onNext: 2
// => onNext: 3
// => onCompleted

{% else %}

Using Observables

Using Promises

{% endif %}