rafa/docs/Channel-next.md

Rafa.js is a Javascript framework for building concurrent applications.

Implementation of an Enumerator. This calls the `read` method with the 
callback provided or throws an error if a callback is already registered.

<aside>
```js
// next(callback: A => _)
var channel = Rafa.channel();
var stream = Rafa.stream();
var values = [];

stream.enumerate(channel).each(v => values.push(v));

channel.write(1);
channel.write(2);

// values: [1,2];
```
</aside>