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Asked: 2026-05-25T18:12:50+00:00

val m = Array(10,20,30,30,50,60,70,80) groupBy ( s => s %30 == 0) m(true).map {

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    val m = Array(10,20,30,30,50,60,70,80) groupBy ( s => s %30 == 0)
    m(true).map { kv => println(kv) }

prints the values 30, 30, 60

I want the indices i.e. 2, 3, 5 to be printed.

How do I go about this?

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1 Answer

  1. Editorial Team
    val m = Array(10,20,30,30,50,60,70,80).zipWithIndex.groupBy(s =>
  s._1 % 30 == 0).map(e => e._1 -> (e._2.unzip._2))

    Just FYI, if you only want the true values, then you could go with @missingfaktor’s approach and equally you could partition this:

    val m = Array(10, 20, 30, 30, 50, 60, 70, 80).zipWithIndex.partition(s =>
  s._1 % 30 == 0)._1.unzip._2
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