getDefaultProps object getDefaultProps() Invoked once and cached when the class is created. Values in the mapping will be set on this.props if that prop is not specified by the parent component (i.e. using an in check). This method is invoked before any instances are created and thus cannot rely on this.props. In addition, be aware that any complex objects returned by getDefaultProps() will be shared across instances, not copied.

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.

Form components such as <input>, <textarea>, and <option> differ from other native components because they can be mutated via user interactions. These components provide interfaces that make it easier to manage forms in response to user interactions. For information on events on <form> see Form Events. Interactive Props Form components support a few props that are affected via user interactions: value, supported by <input> and <textarea> components. check

getInitialState object getInitialState() Invoked once before the component is mounted. The return value will be used as the initial value of this.state.