Computer scienceProgramming languagesKotlinTypes and data structuresCollections

Collections as interface

Theory

Game of collections

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Your friend is a big fan of Game of Thrones and Fight Club. He wrote tricky functions that identify the analog of Tyler Durdan in Game of Thrones:

fun findRepeatedNames(heroes: Collection<String>) = heroes.filter { it.contains("Jon Snow") }

fun main() {
    val heroes = listOf("Jon Snow", "Littlefinger", "Robert I Baratheon", "Jon Snow")

    println(findRepeatedNames(heroes))
}

What will println() output?

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