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https://github.com/IBM/fp-go.git
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fix: add optics and consistent copyright
Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
61
constant/const.go
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61
constant/const.go
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// 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 constant
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import (
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F "github.com/IBM/fp-go/function"
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M "github.com/IBM/fp-go/monoid"
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S "github.com/IBM/fp-go/semigroup"
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)
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type Const[E, A any] struct {
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Value E
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}
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func Make[E, A any](e E) Const[E, A] {
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return Const[E, A]{Value: e}
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}
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func Unwrap[E, A any](c Const[E, A]) E {
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return c.Value
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}
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func Of[E, A any](m M.Monoid[E]) func(A) Const[E, A] {
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return func(a A) Const[E, A] {
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return Make[E, A](m.Empty())
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}
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}
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func MonadMap[E, A, B any](fa Const[E, A], f func(A) B) Const[E, B] {
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return Make[E, B](fa.Value)
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}
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func MonadAp[E, A, B any](s S.Semigroup[E]) func(fab Const[E, func(A) B], fa Const[E, A]) Const[E, B] {
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return func(fab Const[E, func(A) B], fa Const[E, A]) Const[E, B] {
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return Make[E, B](s.Concat(fab.Value, fa.Value))
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}
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}
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func Map[E, A, B any](f func(A) B) func(fa Const[E, A]) Const[E, B] {
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return F.Bind2nd(MonadMap[E, A, B], f)
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}
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func Ap[E, A, B any](s S.Semigroup[E]) func(fa Const[E, A]) func(fab Const[E, func(A) B]) Const[E, B] {
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monadap := MonadAp[E, A, B](s)
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return func(fa Const[E, A]) func(fab Const[E, func(A) B]) Const[E, B] {
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return F.Bind2nd(monadap, fa)
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}
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}
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40
constant/const_test.go
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40
constant/const_test.go
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// 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 constant
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import (
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"testing"
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F "github.com/IBM/fp-go/function"
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"github.com/IBM/fp-go/internal/utils"
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S "github.com/IBM/fp-go/string"
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"github.com/stretchr/testify/assert"
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)
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func TestMap(t *testing.T) {
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fa := Make[string, int]("foo")
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assert.Equal(t, fa, F.Pipe1(fa, Map[string, int](utils.Double)))
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}
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func TestOf(t *testing.T) {
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assert.Equal(t, Make[string, int](""), Of[string, int](S.Monoid)(1))
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}
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func TestAp(t *testing.T) {
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fab := Make[string, int]("bar")
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assert.Equal(t, Make[string, int]("foobar"), Ap[string, int, int](S.Monoid)(fab)(Make[string, func(int) int]("foo")))
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}
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