HN Reader

One of the drawbacks about protocols mentioned in the talk is no longer correct. Protocols can now dispatch on metadata, not just type.

    (defprotocol Dog
      :extend-via-metadata true
      (bark [_]))

I miss the days when productivity booster posts were all about REPL, functional programming, composability, immutability.

Enjoyed this demonstration as well: https://max.computer/blog/solving-the-expression-problem-in-...

Note that "full" solutions are possible in standard OO languages as well (without the usual visitor vs subclasses trade-off): https://news.ycombinator.com/item?id=45210114