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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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12
option/array.go
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@@ -44,3 +44,15 @@ func SequenceArrayG[GA ~[]A, GOA ~[]Option[A], A any](ma GOA) Option[GA] {
func SequenceArray[A any](ma []Option[A]) Option[[]A] {
return SequenceArrayG[[]A](ma)
}
// CompactArrayG discards the none values and keeps the some values
func CompactArrayG[A1 ~[]Option[A], A2 ~[]A, A any](fa A1) A2 {
return RA.Reduce(fa, func(out A2, value Option[A]) A2 {
return MonadFold(value, F.Constant(out), F.Bind1st(RA.Append[A2, A], out))
}, make(A2, len(fa)))
}
// CompactArray discards the none values and keeps the some values
func CompactArray[A any](fa []Option[A]) []A {
return CompactArrayG[[]Option[A], []A](fa)
}