How to check if a note is not found?

Question

React

Here's how I make note routes:

{notesRedux.length ? notesRedux.map((item: any,index: any) => {
                return (
                  <Route exact path={"/note/"+index} key={index}>
                    <NoteText
                      title={item.title}
                      time={item.time}
                      text={item.text}
                      create={false}
                    />
                  </Route>
                )
              }) : false}

It is necessary to make it so that if the note is not found on such a route, then transfer it to the main page.