decorator.js

const App = ({ modifiedList, activeUser }) => {
  if(!Array.isArray(modifiedList)) {
    return null
  }
  return (
    <div className="container-fluid">
      <SearchBarContainer />
      <ToolBarContainer />
      <div className="row">
        <ActiveUser user={modifiedList[activeUser]} />
        <UserList />
      </div>
    </div>
  );
}

export default connect(state => ({
    modifiedList: state.list.modifiedList,
    activeUser: state.activeUser.activeUser,
  }))(App)