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Remember stateless functional components? You can see some familiar ones in Example.js.

How could you write propTypes for a stateless functional component?

// Usual way: class Example extends React.component{ } Example.propTypes = { }; ... // Stateless functional component way: const Example = (props) => { // ummm ??????

It turns out the process if fairly similar. To write propTypes for a stateless functional component, you define a propTypes object as a property of the stateless functional component itself. Here's what that looks like:

const Example = (props) => { return <h1>{props.message}</h1>; } Example.propTypes = { message: React.PropTypes.string.isRequired };
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