Java: Rethink Domain Primitives with Valhalla

ddfa11 1 day ago 11 commentsRead Article on dfa1.github.io

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mrkeen•about 14 hours ago

Oh cool. It's newtype from Haskell 1.3 (1996).

https://www.haskell.org/definition/from12to13.html#newtype

mrkeen•about 2 hours ago

No idea why dfa11's sibling comment got nuked. Looks correct to me.

I guess you can probably do the same with Unpacking.

https://wiki.haskell.org/Performance/Data_types

dfa11•1 day ago

Valhalla removes the historical performance tax on tiny domain objects. This article argues that value classes finally make domain‑safe primitives practical in real systems — strong invariants, flat layout, no wrapper overhead.

I’d love feedback from folks who’ve experimented with Valhalla or have opinions on modelling domain types in Java.