Find Last occurrence index value of inner list and outer list in efficient way in Kotlin-CodePudding

Hey i have nested list and i wanted to find last occurrence index value of inner list and outer list. I tried to search Find last occurrence of a String in array using Kotlin. How can I do this in my case in efficient way.

Group

data class Group(
    val key: Int,
    val value: MutableList<GroupValue?>
)

GroupValue

data class GroupValue(
    val isRead: Boolean? = null,
    val id: String? = null
)

Condition

isRead != true

For example

Scenario 1

 val value = listOf(
        Group(0, mutableListOf(GroupValue(true, "1"))),
        Group(1, mutableListOf(GroupValue(true, "2"))),
        Group(2, mutableListOf(GroupValue(false, "3"))),
        Group(3, mutableListOf(GroupValue(true, "4"))),
        Group(4, mutableListOf(GroupValue(false, "5"))),
        Group(5, mutableListOf(GroupValue(true, "6"))),
    )

Excepted output

inner list index is 0 and outer list index is 4

Scenario 2

val value = listOf(
        Group(0, mutableListOf(GroupValue(true, "1"))),
        Group(1, mutableListOf(GroupValue(true, "2"))),
        Group(2, mutableListOf(GroupValue(false, "3"))),
        Group(3, mutableListOf(GroupValue(true, "4"))),
        Group(4, mutableListOf(GroupValue(false, "5"))),
        Group(5, mutableListOf(GroupValue(true, "6"))),
        Group(6, mutableListOf(GroupValue(true, "6"),GroupValue(false, "7"))),
        Group(7, mutableListOf(GroupValue(true, "7")))
    )

Excepted output

inner list index is 1 and outer list index is 6

Inside this Find first occurrence index value in efficient way in kotlin I asked for first index but now I need in last occurrence .

Thanks in advance.

CodePudding user response：

You can use indexOfLast and indexOfFirst functions for this

var innerIndex = -1
val outerIndex: Int = value.indexOfLast{ group ->
    innerIndex = group.value.indexOfFirst { groupValue -> groupValue != null && groupValue.isRead != true }
    return@indexOfLast innerIndex != -1
}

if(outerIndex != -1) {
    // match found 
}