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fpdjsns/kotlin_list_groupBy.kt

Last active October 15, 2019 23:38
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Kotlin list.groupBy
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kotlin_list_groupBy.kt
data class Member(val no:Long, val name: String)
fun main() {
val list = listOf(Member(1, "일"), Member(1, "이"), Member(3, "삼"))
val result = list.groupBy({it.no}, {it.name})
println(result) // {1=[일, 이], 3=[삼]}
println(result[1]) // [일, 이]
println(result[2]) // null
}
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