diff --git a/lib/funky/funky.go b/lib/funky/funky.go
index 5a8e946..3b6d385 100644
--- a/lib/funky/funky.go
+++ b/lib/funky/funky.go
@@ -33,7 +33,6 @@ func (m *maybe[V]) Value() V {
 // Iterator
 
 type Iterator[V any] interface {
-	Maybe[V]
 	Next() Maybe[V]
 }
 
@@ -43,24 +42,15 @@ type sliceIt[V any] struct {
 }
 
 func SliceIterator[V any](sl []V) Iterator[V] {
-	return &sliceIt[V]{slice: sl}
+	return &sliceIt[V]{-1, sl}
 }
 
 func (it *sliceIt[V]) Next() Maybe[V] {
-	if it.IsNothing() {
+	if it.idx >= len(it.slice)-1 {
 		return Nothing[V]()
 	}
-	v := it.Value()
 	it.idx++
-	return Just(v)
-}
-
-func (it *sliceIt[V]) IsNothing() bool {
-	return it.idx >= len(it.slice)
-}
-
-func (it *sliceIt[V]) Value() V {
-	return it.slice[it.idx]
+	return Just(it.slice[it.idx])
 }
 
 func Slice[V any](it Iterator[V]) []V {