Here's how false renders in different situations: Renders as id="false":

ReactDOMServer.renderToString string renderToString(ReactElement element)

ReactDOM.unmountComponentAtNode boolean unmountComponentAtNode(DOMElement container)

This isn't really a React-specific tip, as such anti-patterns often occur in code in general; in this case, React simply points them out more clearly.

Updating: componentWillUpdate void componentWillUpdate( object nextProps, object nextState

ReactDOM.findDOMNode DOMElement findDOMNode(ReactComponent component)

replaceProps void replaceProps( object nextProps, [function callback] )

Updating: componentWillReceiveProps void componentWillReceiveProps( object nextProps

The React add-ons are a collection of useful utility modules for building React apps. These should be considered experimental and tend to change more often

React.createClass ReactClass createClass(object specification)