fix: more testing

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

either/array_test.go

@@ -1,8 +1,10 @@
 package either
 
 import (
+	"fmt"
 	"testing"
 
+	TST "github.com/IBM/fp-go/internal/testing"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -16,3 +18,33 @@ func TestCompactArray(t *testing.T) {
 	res := CompactArray(ar)
 	assert.Equal(t, 2, len(res))
 }
+
+func TestSequenceArray(t *testing.T) {
+
+	s := TST.SequenceArrayTest(
+		FromStrictEquals[error, bool](),
+		Pointed[error, string](),
+		Pointed[error, bool](),
+		Functor[error, []string, bool](),
+		SequenceArray[error, string],
+	)
+
+	for i := 0; i < 10; i++ {
+		t.Run(fmt.Sprintf("TestSequenceArray %d", i), s(i))
+	}
+}
+
+func TestSequenceArrayError(t *testing.T) {
+
+	s := TST.SequenceArrayErrorTest(
+		FromStrictEquals[error, bool](),
+		Left[string, error],
+		Left[bool, error],
+		Pointed[error, string](),
+		Pointed[error, bool](),
+		Functor[error, []string, bool](),
+		SequenceArray[error, string],
+	)
+	// run across four bits
+	s(4)(t)
+}

either/functor.go

@@ -0,0 +1,31 @@
+// Copyright (c) 2024 IBM Corp.
+// All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package either
+
+import (
+	"github.com/IBM/fp-go/internal/functor"
+)
+
+type eitherFunctor[E, A, B any] struct{}
+
+func (o *eitherFunctor[E, A, B]) Map(f func(A) B) func(Either[E, A]) Either[E, B] {
+	return Map[E, A, B](f)
+}
+
+// Functor implements the functoric operations for [Either]
+func Functor[E, A, B any]() functor.Functor[A, B, Either[E, A], Either[E, B]] {
+	return &eitherFunctor[E, A, B]{}
+}

either/pointed.go

@@ -0,0 +1,31 @@
+// Copyright (c) 2024 IBM Corp.
+// All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package either
+
+import (
+	"github.com/IBM/fp-go/internal/pointed"
+)
+
+type eitherPointed[E, A any] struct{}
+
+func (o *eitherPointed[E, A]) Of(a A) Either[E, A] {
+	return Of[E, A](a)
+}
+
+// Pointed implements the pointedic operations for [Either]
+func Pointed[E, A any]() pointed.Pointed[A, Either[E, A]] {
+	return &eitherPointed[E, A]{}
+}