fix: add Take to Iterables

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

iterator/stateless/scan_test.go

@@ -0,0 +1,42 @@
+// Copyright (c) 2023 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 stateless
+
+import (
+	"testing"
+
+	F "github.com/IBM/fp-go/function"
+	T "github.com/IBM/fp-go/tuple"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestScan(t *testing.T) {
+
+	src := From("a", "b", "c")
+
+	dst := F.Pipe1(
+		src,
+		Scan(func(cur T.Tuple2[int, string], val string) T.Tuple2[int, string] {
+			return T.MakeTuple2(cur.F1+1, val)
+		}, T.MakeTuple2(0, "")),
+	)
+
+	assert.Equal(t, ToArray(From(
+		T.MakeTuple2(1, "a"),
+		T.MakeTuple2(2, "b"),
+		T.MakeTuple2(3, "c"),
+	)), ToArray(dst))
+}