stefanesterer

List<Merchant> findTopMerchants(List<Merchant> merchants, int month) {
    // Local record
    record MerchantSales(Merchant merchant, double sales) {}
 
    return merchants.stream()
        .map(merchant -> new MerchantSales(merchant, computeSales(merchant, month)))
        .sorted((m1, m2) -> Double.compare(m2.sales(), m1.sales()))
        .map(MerchantSales::merchant)
        .collect(toList());
}