Add iter.ForEach

Author: Rajan-226

iter/iter.go

@@ -60,3 +60,14 @@ func ToChannel[T any](iter Iterator[T]) chan T {
 
 	return ch
 }
+
+// ForEach consumes an iterator and executes callback function on each item.
+func ForEach[T any](iter Iterator[T], callback func(T)) {
+	for {
+		if value, ok := iter.Next().Value(); ok {
+			callback(value)
+		} else {
+			break
+		}
+	}
+}

iter/iter_test.go

@@ -70,3 +70,22 @@ func TestToChannelEmpty(t *testing.T) {
 		t.Fail()
 	}
 }
+
+func TestForEach(t *testing.T) {
+	words := iter.Lift([]string{"foo", "bar", "baz"})
+	sum := ""
+	iter.ForEach[string](words, func(word string) {
+		sum += word
+	})
+	assert.Equal(t, "foobarbaz", sum)
+}
+
+func TestForEachEmpty(t *testing.T) {
+	words := iter.Lift([]string{})
+	sum := ""
+	iter.ForEach[string](words, func(word string) {
+		sum += word
+	})
+
+	assert.Empty[string](t, sum)
+}