kone.collections/dev.lounres.kone.collections.utils/groupBy

groupBy

inline fun <E, K> KoneIterable<E>.groupBy(keyEquality: Equality<K> = defaultEquality(), keyHashing: Hashing<K>? = null, keyOrder: Order<K>? = null, keySelector: (E) -> K): KoneMap<K, KoneList<E>>(source)
inline fun <E, K, V> KoneIterable<E>.groupBy(keyEquality: Equality<K> = defaultEquality(), keyHashing: Hashing<K>? = null, keyOrder: Order<K>? = null, keySelector: (E) -> K, valueTransform: (E) -> V): KoneMap<K, KoneList<V>>(source)