Get value from sorting data in Kolin-CodePudding

My task is to return ArrayList of type transactionsList

First I have to parse date in string and then stream it (ascending)

I know how to do that but sortedWith give back type Unit not Array.

 val cmp = compareBy<transactionsList> { LocalDate.parse(it.date, 
DateTimeFormatter.ofPattern("dd.MM.yyyy.")) }


        val sortedList: List<transactionsList> = ArrayList()

      acountTransactionList
          . sortedWith(cmp)
          .forEach(::println)

        return acountTransactionList

I cannot store data from that sort because it gives me type Unit.

CodePudding user response：

The following works as intended (the issue is that forEach() method returns Unit, not each object):

fun main() {
    val acountTransactionList: ArrayList<transactionsList> = arrayListOf(transactionsList("10.10.2010."),
        transactionsList("10.10.2000."),
        transactionsList("10.09.2010."),
        transactionsList("10.11.2010."),
        transactionsList("11.11.2010."),
        transactionsList("10.10.2001."))

    val cmp = compareBy<transactionsList> {
        LocalDate.parse(it.date, DateTimeFormatter.ofPattern("dd.MM.yyyy."))
    }

    val sortedList: List<transactionsList> = acountTransactionList.sortedWith(cmp)
    println(sortedList)
}

data class transactionsList(val date: String)