angular 2 observable polling

poll.js

Rx.Observable
    .interval(500)
    .flatMap(() => [1, 2, 3] /* in angular you will call getData() to make an HTTP request */)
    .map(x => x + 1)
    .subscribe(x => console.log(x))

function getData() {
  return this.http
      .get('https://api.spotify.com/v1/search?q=' + term + '&type=artist')
      .map((response) => response.json())
}