How can I filter array of <Any> by its type -Kotlin?-CodePudding

I have an array arrayOf<Any>("Apple",46,"287",574,"Peach","3","69",78,"Grape","423") and I need to sort it: firstly numbers suppose to go like "3",46,"69"... and then words by alphabet... So I am trying first to divide them on separate arrays by type and then some manipulation. Do you have advice of how to solve this problem?

CodePudding user response：

So just had to make some manipulation

val onlyNumbers = a.filterIsInstance<Int>()
val allStrings = a.filterIsInstance<String>().sorted()
val onlyStrings = mutableListOf<String>()
val listOfEditedNumbers = mutableListOf<Int>()
allStrings.forEach {
    try {
        val toInt = it.toInt()
        listOfEditedNumbers.add(toInt)
    } catch (e: java.lang.Exception){
        onlyStrings.add(it)
    }
}
val allNumbers = onlyNumbers.toList()   listOfEditedNumbers
val finalSortedNumberList = allNumbers.sorted()
val finalNumbersList = mutableListOf<Any>()
finalSortedNumberList.forEach {
    if (it in onlyNumbers) finalNumbersList.add(it)
    if (allStrings.contains(it.toString())) finalNumbersList.add(it.toString())
}
val finalTotalList = finalNumbersList   onlyStrings.sorted()

CodePudding user response：

You can try my solution


val a = arrayOf<Any>("Apple",46,"287",574,"Peach","3","69",78,"Grape","423")
 val numbers = mutableListOf<Int>()
   val strings = mutableListOf<String>()
   val stringNumber = mutableListOf<Int>()
   
   for(e in a){
       if(e is Int) numbers.add(e)
       if(e is String){
           if(e.toIntOrNull() == null){
               strings.add(e)
           } else {
               stringNumber.add(e.toInt())
           }
       }
   }
   
   val result = (numbers   stringNumber).sorted().map { value -> 
       // convert back to String
       stringNumber.find{ it == value }?.toString() ?: value
   }   strings.sorted() 
   
   println(result)

CodePudding user response：

You can sort the array using a custom comparator:

fun main() {
    println(
        arrayOf<Any>("Apple",46,"287",574,"Peach","3","69",78,"Grape","423")
            .sortedBy {
                if (it is Number || (it is String && it.toLongOrNull() != null))
                    1
                else
                    2
            }
    )
}

Output: [46, 287, 574, 3, 69, 78, 423, Apple, Peach, Grape]