async function handler(req: NextApiRequest, res: NextApiResponse<Response>) {
  await verifyUserToken(req, res)

  const automobileQuery = req.query.automobile.toString().split(',')

  if (automobileQuery.length > 2) {
    throw new CustomError(
      400,
      'automobile URL parameter expects a maximum of two values'
    )
  }

  let values: VehicleType[] | undefined

  if (automobileQuery.includes('BIKE')) {
    if (values === undefined) values = []
    values.push(VehicleType.BIKE)
  }
  if (automobileQuery.includes('CAR')) {
    if (values === undefined) values = []
    values.push(VehicleType.CAR)
  }

  let vehicleType = undefined

  let orders = await prisma.order.findMany({
    where: {
      vendorId: null,
      trackingStatus: 'READY_FOR_PICKUP',
      vehicleType: { in: values },
    },
  })

  return res.json({
    status: true,
    data: { orders },
  })
}

const validVehiclesTypes: Record<string, VehicleType> = {
  BIKE: VehicleType.BIKE,
  CAR: VehicleType.CAR,
}
const values: VehicleType[] = automobileQuery
  .map((vehicle) => validVehicleTypes[vehicle])
  .filter(Boolean)

.filter(Boolean)

reduce

flatMap

filter

false