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41 lines
1.4 KiB
Go
41 lines
1.4 KiB
Go
// Copyright (c) 2023 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package option
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import (
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F "github.com/IBM/fp-go/function"
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)
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// Sequence converts an [Option] of some higher kinded type into the higher kinded type of an [Option]
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func Sequence[A, HKTA, HKTOA any](
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mof func(Option[A]) HKTOA,
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mmap func(func(A) Option[A]) func(HKTA) HKTOA,
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) func(Option[HKTA]) HKTOA {
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return Fold(F.Nullary2(None[A], mof), mmap(Some[A]))
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}
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// Traverse converts an [Option] of some higher kinded type into the higher kinded type of an [Option]
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func Traverse[A, B, HKTB, HKTOB any](
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mof func(Option[B]) HKTOB,
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mmap func(func(B) Option[B]) func(HKTB) HKTOB,
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) func(func(A) HKTB) func(Option[A]) HKTOB {
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onNone := F.Nullary2(None[B], mof)
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onSome := mmap(Some[B])
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return func(f func(A) HKTB) func(Option[A]) HKTOB {
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return Fold(onNone, F.Flow2(f, onSome))
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}
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}
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