Nicer data transformation with KopyKat and Optics
summary
Concrete tradeoffs and runnable techniques: KopyKat is a compiler plugin that gives a mutable scope API but implements it by code generation via KSP that effectively doubles data-class size and must copy and freeze nested objects at runtime, so expect measurable allocation cost. Arrow Optics generates field optics (also via KSP), composes lenses/prisms like every.list to target collections, and focuses on composable transformations rather than mutable-scope convenience.
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chapters (5)
- 0:00The immutability challenge
- 2:36Introducing Copycat
- 4:21Exploring Arrow Optics
- 7:18Future improvements
- 8:52Q&A and closing
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