const myPromise = val =>

  new Promise(resolve =>

    setTimeout(() => resolve(`Promise Resolved: ${val}`), 5000)

  );

​

/*

  when all observables complete, give the last

  emitted value from each as an array

*/

const example = Rx.Observable.forkJoin(

  //emit 'Hello' immediately

  Rx.Observable.of('Hello'),

  //emit 'World' after 1 second

  Rx.Observable.of('World').delay(1000),

  //emit 0 after 1 second

  Rx.Observable.interval(1000).take(1),

  //emit 0...1 in 1 second interval

  Rx.Observable.interval(1000).take(2),

  //promise that resolves to 'Promise Resolved' after 5 seconds

  myPromise('RESULT')

);

//output: ["Hello", "World", 0, 1, "Promise Resolved: RESULT"]

const subscribe = example.subscribe(val => console.log(val));