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GHC's DerivingVia extension (since 8.6) lets you compose typeclass instances without boilerplate newtype wrappers. A practical walkthrough with JSON encoding example, role restrictions, and a verification checklist.
Flip numeric ordering in Haskell with DerivingVia and Data.Ord.Down: a concise, zero‑overhead solution for priority types and more.
Learn how Haskell’s DerivingVia extension cuts boilerplate by reusing existing instances for newtypes. A step‑by‑step guide with code examples, trade‑offs, and a quick checklist to get you started.
Learn how Haskell’s DerivingVia extension lets you derive typeclass instances for newtypes by reusing instances of a representationally equal type, with a concrete MinInt example and verification steps.
Give primitives semantic meaning with zero‑cost wrappers using Haskell’s DerivingVia. Learn the pattern, mechanics, a worked example, trade‑offs, and how to adopt it safely in your codebase.
haskell