React.PropTypes React.PropTypes includes types that can be used with a component's propTypes object to validate props being passed to your components. For more information about propTypes, see Reusable Components.

We'll be building a simple but realistic comments box that you can drop into a blog, a basic version of the realtime comments offered by Disqus, LiveFyre or Facebook comments. We'll provide: A view of all of the comments A form to submit a comment Hooks for you to provide a custom backend It'll also have a few neat features: Optimistic commenting: comments appear in the list before they're saved on the server so it feels fast. Live updates: other users' comments are popped into the comment

React.isValidElement boolean isValidElement(* object) Verifies the object is a ReactElement.

mixins array mixins The mixins array allows you to use mixins to share behavior among multiple components. For more information about mixins, see Reusable Components.