operator length # supports linked-list

operator-length.go

@@ -37,6 +37,8 @@ func evalLength(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 	} else if kern.IsDict(childValue) {
 		m, _ := childValue.(*kern.DictType)
 		v = int64(len(*m))
+	} else if lls, ok := childValue.(*kern.LinkedList); ok {
+		v = int64(lls.Len())
 	} else if it, ok := childValue.(kern.Iterator); ok {
 		v = int64(it.Count())
 		// if extIt, ok := childValue.(ExtIterator); ok && extIt.HasOperation(CountName) {