title: RxJS 1 array item into sequence of single items - operator
body: <p>Given such observable</p>
  
  <pre><code>Rx.Observable.of([1,2,3,4,5])
  </code></pre>
  
  <p>which emits a <em>single item</em> (that is an array), <strong>what is the operator</strong> that will transform this observable to a one that emits 5 single items (or whatever the array consists of)?</p>
  
  <p>The example is on <code>.of</code>, but it would be the same for fetching arrays via promises, there might be many other examples. Don't suggest to replace <code>of</code> with <code>from</code></p>