Computer scienceProgramming languagesKotlinTypes and data structuresOperations with collections

Mapping transformation

Theory

The right result

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What is the result of this code? 

fun main() {
    val listWords = listOf(listOf("anne", "michael"), listOf("caroline", "dimitry"), listOf("emilio", "francois"))

    println(listWords.flatMap { it.mapIndexedNotNull { index, value -> if (index % 2 == 0) value.uppercase() else null } })
}
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