kmongo-dsl-sync/org.litote.kmongo/groupingBy

groupingBy

inline fun <T, K> MongoIterable<T>.groupingBy(crossinline keySelector: (T) -> K): Grouping<T, K>

Creates a Grouping source from a collection to be used later with one of group-and-fold operations using the specified keySelector function to extract a key from each element.

Samples

samples.collections.Collections.Transformations.groupingByEachCount