fun main() { val list = listOf(1, 2, 3, 4, 5) val result = list.flatMap { listOf(it, it * 2) } println(result) }
[1, 2, 2, 4, 3, 6, 4, 8, 5, 10]
[1, 2, 3, 4, 5]
[1, 2, 3, 4, 5, 2, 4, 6, 8, 10]
[1, 2, 3, 4, 5, 1, 2, 3, 4, 5]
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