How can merge multiple list to form alternative el...

# android

[Chethan]

How can merge multiple list to form alternative elements ? We have kotlin zip function to combine two list and to form alternative element list , zip is limited for two list, I have to do for multiple list . what is best approach to do

[Cicero]

Is your issue resolved in any of this google results?

https://www.google.com/search?q=kotlin+combining+multiple+lists&oq=kotlin+combining+[…]s&aqs=edge..69i64j0i22i30l8.8098j0j1&sourceid=chrome&ie=UTF-8

[tseisel]

If you'd like to zip N lists, you could use the List function:

val firstList: List<A> = ...
val secondList: List<B> = ...
val thirdList: List<C> = ...
val mergedList: List<R> = List(
  minOf(firstList.size, secondList.size, thirdList.size)
) { index ->
  val a = firstList[index]
  val b = secondList[index]
  val c = thirdList[index]
  ... your combine logic ...
}

[Chethan]

@Cicero @tseisel Thanks for showing your response to me

I wrote it my own , it works like a charm

private fun combine(lists: List<List<AmbientCardInfo>>): List<AmbientCardInfo> {

    if (lists.isEmpty()) return emptyList()

    val iteratorList = mutableListOf<Iterator<AmbientCardInfo>>()
    lists.forEach {
        iteratorList.add(it.iterator())
    }


    val combinedList = mutableListOf<AmbientCardInfo>()
    var index = 0


    while (iteratorList.size > 0) {
        val iteratorIndex = index % iteratorList.size
        when  {
            iteratorList[iteratorIndex].hasNext() -> {
                combinedList.add(iteratorList[iteratorIndex].next())
            }
            else -> {
                iteratorList.removeAt(iteratorIndex)
            }
        }
        index++
    }

    return combinedList
}