diff --git a/06_repetitions/for.v b/06_repetitions/for.v
index db85909..e4ae58b 100644
--- a/06_repetitions/for.v
+++ b/06_repetitions/for.v
@@ -28,5 +28,48 @@ pub fn main() {
 
 	// ==================================== //
 
+	nums := [1,2,3,4,5]
+	iter := SquareIterator {
+		arr : nums
+	}
+
+	for squared in iter {
+		println(squared)
+	}
+
+	// ==================================== //
+
+
 	
-}
\ No newline at end of file
+}
+
+
+struct SquareIterator {
+	arr []int
+
+
+mut:
+	idx int
+}
+
+fn (mut iter SquareIterator) next() ?int{
+	if iter.idx >= iter.arr.len {
+		return none
+	}else {
+		defer {
+			iter.idx++
+		}
+		return iter.arr[iter.idx]
+	}
+}
+
+//fn (mut iter SquareIterator) next() ?int {
+//	if iter.idx >= iter.arr.len {
+//		return none
+//	}
+//	defer {
+//		iter.idx++
+//	}
+//
+//	return iter.arr[iter.idx] * iter.arr[iter.idx]
+//}
\ No newline at end of file