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lukeduncan-scot/iterable_sequence_count_pairs.kts

Last active May 24, 2021 22:23
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Counts Pairs in Iterable & Sequence
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iterable_sequence_count_pairs.kts
fun <T> Iterable<T>.countPairs() = groupingBy { it }
.eachCount()
.values
.sumOf { it.div(2) }
fun <T> Sequence<T>.countPairs() = groupBy { it }
.mapValues { it.value.size }
.values
.sumOf {it.div(2)}
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