assocByTo

inline fun <T, K, M : MutableMap<in K, in T>> Iterable<T>.assocByTo(destination: M, keySelector: (T) -> K): M
inline fun <T, K, M : MutableMap<in K, in T>> Sequence<T>.assocByTo(destination: M, keySelector: (T) -> K): M

Populates and returns the destination mutable map with key-value pairs, where key is provided by the keySelector function applied to each element of the given collection and value is the element itself.

If any two elements had the same key returned by keySelector the last one gets added to the map and the method creates a warning.

inline fun <T, K, V, M : MutableMap<in K, in V>> Iterable<T>.assocByTo(destination: M, keySelector: (T) -> K, valueTransform: (T) -> V): M
inline fun <T, K, V, M : MutableMap<in K, in V>> Sequence<T>.assocByTo(destination: M, keySelector: (T) -> K, valueTransform: (T) -> V): M

Populates and returns the destination mutable map with key-value pairs, where key is provided by the keySelector function and value is provided by the valueTransform function applied to elements of the given collection.

If any two elements had the same key returned by keySelector the last one gets added to the map and the method creates a warning.