import React from 'react' ; import BackButton from '../../components/BackButton' ; import { useStore } from '../../hooks/useStore' ; function ChatBackButton ( ) { const store = useStore ( ) ; const unread = store . linkmans . reduce ( ( result , linkman ) => { result += linkman . unread ; return result ; } , 0 ) ; return < BackButton text = { unread . toString ( ) } />; } export default ChatBackButton ;