Question

What is the use of the ownProps parameter in mapStateToProps() and mapDispatchToProps()?

Answer 1

If the ownProps parameter is specified, React Redux will pass the props that were passed to the component into your connect functions. So, if you use a connected component:

import ConnectedComponent from './containers/ConnectedComponent';

<ConnectedComponent user={'john'} />

The ownProps inside your mapStateToProps() and mapDispatchToProps() functions will be an object:

{ user: 'john' }

You can use this object to decide what to return from those functions.