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var Observable = Rx.Observable;
function mockHTTPRequest(url) {
    return Observable.of(`Response from ${url}`)
      .delay(Math.random() * 1000);
}
var urls = ['url-1', 'url-2', 'url-3', 'url-4'];
var observables = urls.map(url => mockHTTPRequest(url));
Observable.forkJoin(observables, (...results) => {
    return results.length;
  })
  .subscribe(val => console.log(val));
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