reduceTo
inline fun <S, T : S, K, M : MutableMap<in K, S>> Grouping<T, K>.reduceTo(
destination: M,
operation: (key: K, accumulator: S, element: T) -> S
): M
Platform and version requirements: Kotlin 1.1
Groups elements from the Grouping source by key and applies the reducing 登录查看完整内容
