Flexible Modeling: Keeping Your Domain Pure with Scala 3
summary
Refactors a boilerplate-heavy user domain by replacing wrapper classes and implicits with opaque types, extension methods, enums and union types. Shows a concrete airline example: add name.toAirlineSafe via an extension method instead of wrappers; use opaque types to make Name distinct from UserId with 100% no runtime allocation but explicit smart constructors; replace sealed-trait boilerplate with three-line enums; use union types to model search results without leaking a common trait. Result is a minimal, boundary-clean domain that compiles and runs.
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chapters (7)
- 0:00Clean domain modeling
- 3:11Integration leaks with extensions
- 10:00Replacing AnyVal with opaque types
- 15:37Simplifying enums for status
- 17:23Preventing API leaks with union types
- 20:57Clean domain matters with AI
- 23:10Summary of Scala 3 tools
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