sumByLong

inline fun <T> Iterable<T>.sumByLong(selector: (T) -> Long): Long

Returns the sum of all values produced by selector function applied to each element in the collection.

inline fun <T> Sequence<T>.sumByLong(selector: (T) -> Long): Long

Returns the sum of all values produced by selector function applied to each element in the sequence.

The operation is terminal.