React Base Fiddle (JSX)

Starting point for creating JSFiddles with React.

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.min.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

Babel + JSX

console.clear();

const elements1 = function* () {
    yield 'A';
    yield 'B';
    yield 'C';
};

const elements2 = Immutable.Seq.of('X', 'Y', 'Z');

const elements3  = {
    [Symbol.iterator]: function* () {
       yield 1;
       yield 2;
       yield 3;
    }
}

const App = props => (
    <ol>
        <li>{[...elements1()]}</li>
        <li>{elements1()} (THIS IS NOT WORKING =&gt;React@16)</li>
        <li>{elements2}</li>
        <li>{elements3}</li>
    </ol>
);

ReactDOM.render(
    <App></App>,
    document.getElementById('container')
);