arrow-core-data / arrow.core / kotlin.collections.Iterable / reduceOrNull
fun <A, B> Iterable<A>.reduceOrNull(initial: (A) -> B, operation: (acc: B, A) -> B): B?
fun <A, B>
Iterable
<A>.reduceOrNull(initial: (A) -> B, operation: (acc: B, A) -> B): B?
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