How to switch next Array index inside Map function javascript?

lets say, I have entry1.number1 and entry1.number2 in a single entry. I need to compare a number with entry1.number2 & entry2.number2.

My code snippet:

useEffect(() => {
    setActiveVehicleIds(activeEntries.map((entry) => (timeFormatter(entry.departure_time) <= sysTime && sysTime <= timeFormatter(entry.arrival_time)
      ? entry.vehicleid
      : false)));
  }, [activeEntries]);

what condition I should write to compare?