In this talk, we learn about the basics of my library called "record4s", which provides type-safe extensible records for Scala 3. It runs on JVM, JS, and Native platforms. You will see how it is implemented efficiently by using Scala 3 macros, and how record types as structural types, which work without reflection in Scala 3, are helpful in domain modeling. record4s --- Scala 3のための拡張可能レコード、そして構造的型
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