class: center, middle # When to use subtyping & when not use to it Scala Matsuri 2024 2024/06/09<br> @gakuzzzz --- class: left, top ## Who am I * Manabu NAKAMURA * Twitter: [@gakuzzzz](https://twitter.com/gakuzzzz) * Tech to Value Co.,Ltd. CEO * Alp, Inc. Tech Lead