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<script src="https://unpkg.com/@reactivex/rxjs@5.0.0-beta.7/dist/global/Rx.umd.js"></script>
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const array = Rx.Observable.from([1,2,3])
  .take(2)
  .map(x => x + 1)
array.subscribe(
    next => console.log('next:', next),
    error => console.log('error:', error),
    () => console.log('completed')
  )
  
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duncanhunterpro
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