array builtins

object/str.go

@@ -24,3 +24,9 @@ func (s *String) Equal(other Object) bool {
 	}
 	return false
 }
+func (s *String) Less(other Object) bool {
+	if obj, ok := other.(*String); ok {
+		return s.Value < obj.Value
+	}
+	return false
+}