What's "One Cool Thing" about OCaml? I.e. some piece of code or language concept which is more elegant or powerful in ocaml than in most or all other mainstream languages, but that could be explained to a room of unfamiliar cs majors in under five minutes?

• heaps

  1 29 0.0 Haskell

  Asymptotically optimal Brodal/Okasaki heaps (by ekmett)

You can implement all this in Haskell (and Kmett has), but the double-layer functor presentation is beautiful in its expression of recursion and memoization through the composition of first-class modules. Yes, you could do this with typeclasses in Haskell, but typeclasses but I think there's just an element of elegance to first-class modules that can't be found with typeclasses. (Not the mention Haskell's horridly bare-bones module system.)

• WorkOS

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