# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2017-11-04 23:35:43 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/926956151874490369) In reply to: [@nicklockwood](http://twitter.com/nicklockwood/status/926950607776288768) @nicklockwood @SteveStreza My test is: Classes are about identity. If it’s just bundles of data, it’s a struct.