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fix: add compact methods

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Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
Dr. Carsten Leue
2023-09-08 22:54:58 +02:00
parent cf1c886f48
commit 4f04344cda
7 changed files with 116 additions and 1 deletions
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21
either/record.go
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@@ -43,3 +43,24 @@ func SequenceRecordG[GA ~map[K]A, GOA ~map[K]Either[E, A], K comparable, E, A an
func SequenceRecord[K comparable, E, A any](ma map[K]Either[E, A]) Either[E, map[K]A] {
return SequenceRecordG[map[K]A](ma)
}
func upsertAtReadWrite[M ~map[K]V, K comparable, V any](r M, k K, v V) M {
r[k] = v
return r
}
// CompactRecordG discards the noe values and keeps the some values
func CompactRecordG[M1 ~map[K]Either[E, A], M2 ~map[K]A, K comparable, E, A any](m M1) M2 {
out := make(M2)
onLeft := F.Constant1[E](out)
return RR.ReduceWithIndex(m, func(key K, _ M2, value Either[E, A]) M2 {
return MonadFold(value, onLeft, func(v A) M2 {
return upsertAtReadWrite(out, key, v)
})
}, out)
}
// CompactRecord discards all none values and keeps the somes
func CompactRecord[K comparable, E, A any](m map[K]Either[E, A]) map[K]A {
return CompactRecordG[map[K]Either[E, A], map[K]A](m)
}