fix: add ioeither

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

bytes/bytes.go

@@ -0,0 +1,5 @@
+package bytes
+
+func ToString(a []byte) string {
+	return string(a)
+}

bytes/monoid.go

@@ -0,0 +1,19 @@
+package bytes
+
+import (
+	"bytes"
+
+	A "github.com/ibm/fp-go/array"
+	O "github.com/ibm/fp-go/ord"
+)
+
+var (
+	// monoid for byte arrays
+	Monoid = A.Monoid[byte]()
+
+	// ConcatAll concatenates all bytes
+	ConcatAll = A.ArrayConcatAll[byte]
+
+	// Ord implements the default ordering on bytes
+	Ord = O.MakeOrd(bytes.Compare, bytes.Equal)
+)

bytes/monoid_test.go

@@ -0,0 +1,11 @@
+package bytes
+
+import (
+	"testing"
+
+	M "github.com/ibm/fp-go/monoid/testing"
+)
+
+func TestMonoid(t *testing.T) {
+	M.AssertLaws(t, Monoid)([][]byte{[]byte(""), []byte("a"), []byte("some value")})
+}