sample-component.js

import {getLoggedUser} from './selectors';

class LoggedUserName extends React.Component{
    render(){
        return this.props.user ? <p>{this.props.user.username}</p> : <p>Anonymous Cow</p>;
    }
}

function mapStateToProps(state){
    return {
        user: getLoggedUser(state)
    };
}

LoggedUserName = connect(mapStateToProps)(LoggedUserName);