Typeable is interesting in theory and generic traversals are a godsend, but usually I find that when I'm reaching for that particular hammer I should check twice.
Re:Clojure's core.typed vs Haskell
by brandonbloom on Monday September 30, 2013 @05:28PM
(#6472495)
I'll agree it's best to avoid fully open unions when you can, but some (super useful) things truly don't work that way. Check out
http://okmij.org/ftp/Computation/monads.html#ExtensibleDS for a cool example.
I always think of Control.Exception as the poster child for open unions.
Re:Clojure's core.typed vs Haskell
by brandonbloom on Monday September 30, 2013 @08:08PM
(#6473172)
Perfect, since exceptions are a subset of effects! Check out http://math.andrej.com/eff/ and its literature.
That's debatable, however Data.Dynamic is built on top of Data.Typeable, which provides a lower level runtime type safety facility. I think we can both agree Typable has lots of interesting uses.