initial checkin

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

array/traverse_test.go

@@ -0,0 +1,28 @@
+package array
+
+import (
+	"testing"
+
+	O "github.com/ibm/fp-go/option"
+	"github.com/stretchr/testify/assert"
+)
+
+type ArrayType = []int
+
+func TestTraverse(t *testing.T) {
+
+	traverse := Traverse(
+		O.Of[ArrayType],
+		O.MonadMap[ArrayType, func(int) ArrayType],
+		O.MonadAp[int, ArrayType],
+
+		func(n int) O.Option[int] {
+			if n%2 == 0 {
+				return O.None[int]()
+			}
+			return O.Of(n)
+		})
+
+	assert.Equal(t, O.None[[]int](), traverse(ArrayType{1, 2}))
+	assert.Equal(t, O.Of(ArrayType{1, 3}), traverse(ArrayType{1, 3}))
+}