51 | );
52 | }
53 | }
54 |
55 | // This Observable will emit an incrementing
56 | // number every 100ms
57 | let stream = Observable.interval(100);
58 | ReactDOM.render(, container);
59 |
60 | ```
61 | 
62 |
63 | The observable can emit simple primitives (e.g. strings, numbers) or you can even emit JSX elements! Each "onNext" just needs to be a single value, arrays are not supported because of React limitations.
64 |
65 | When the observable emits new values, only the content inside `` will re-render, not the component in which you declare it, so it's very efficient.
66 |
67 | Depending on your preferences, you might find it helpful to use a shorter name for `Subscribe` when you import it. Since it's the default export, what you name it is totally up to you:
68 |
69 | ```jsx
70 | import Sub from 'react-observable-subscribe';
71 |
72 | // etc
73 |
74 |
75 | {stream.throttleTime(1000)}
76 |
77 | ```
78 | ## Server-side rendering
79 |
80 | If you do Server-side rendering with `React.renderToString`, it's important to note that since React doesn't support asynchronous rendering `` will `subscribe()` to the stream but then immediately `unsubscribe()`, so any *synchronously emitted* value will be rendered, otherwise nothing. One approach to emit a synchronous value in RxJS v5 is the [`startWith(value)`](http://reactivex.io/rxjs/class/es6/Observable.js~Observable.html#instance-method-startWith) operator, e.g. you might emit some "Loading..." text or `