title: How to emit integers from certain range with some interval of time using rxjs
body: <p>I'm using this but interval operator wants to be on observable object its not exist on range, is there a way to have observable that emit for example emit 60 integer with interval of 1 second, i have been doing this</p>
  
  <pre><code> this.clock = Observable.range(1,60);
   this.clock = this.clock.interval(1000).map(function(value){
       console.log(value)
       return value;
   })
  </code></pre>
  
  <p>Its saying interval is not a function</p>
  
  <p>also tried this:</p>
  
  <pre><code> this.clock = Observable.range(1,60).interval(1000).map(function(value){
       console.log(value)
       return value;
   })
  </code></pre>