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fix: add first and last

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Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
Dr. Carsten Leue
2023-08-07 22:35:06 +02:00
parent 74fd0c96e7
commit 469c60f05d
7 changed files with 205 additions and 10 deletions
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23
iterator/stateless/generic/iterator.go
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@@ -49,18 +49,21 @@ func FromArray[GU ~func() O.Option[T.Tuple2[GU, U]], US ~[]U, U any](as US) GU {
})(as)
}
// reduce applies a function for each value of the iterator with a floating result
func reduce[GU ~func() O.Option[T.Tuple2[GU, U]], U, V any](as GU, f func(V, U) V, initial V) V {
next, ok := O.Unwrap(as())
current := initial
for ok {
// next (with bad side effect)
current = f(current, next.F2)
next, ok = O.Unwrap(next.F1())
}
return current
}
// Reduce applies a function for each value of the iterator with a floating result
func Reduce[GU ~func() O.Option[T.Tuple2[GU, U]], U, V any](f func(V, U) V, initial V) func(GU) V {
return func(as GU) V {
next, ok := O.Unwrap(as())
current := initial
for ok {
// next (with bad side effect)
current = f(current, next.F2)
next, ok = O.Unwrap(next.F1())
}
return current
}
return F.Bind23of3(reduce[GU, U, V])(f, initial)
}
// ToArray converts the iterator to an array