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  1. prije 8 sati

    My notes on (indexed) type families in Haskell

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  2. prije 19 sati

    Memorandum: complex logic on the database makes database migrations harder.

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  3. 2. velj

    fromNat :: (forall n. SNat n -> r) -> Nat -> r

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  4. 2. velj
    Prikaži ovu nit
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  5. 2. velj

    This is the product of 24h developing non-stop:

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  6. 30. sij
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  7. 18. sij

    It also comes with support for serializing libraries such as aeson:

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  8. 18. sij

    safe-money () is a solid example of type-safety and good design. The complexity added by the type-level techniques is really low but the benefits are huge.

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  9. 14. sij
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  10. 13. sij

    Not well-known lenses features: - Virtual fields - Breakage-free refactoring - Data correction - Maintaining invariants

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  11. 13. sij
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  12. 5. sij

    It took me more than expected to set up a project with cabal + nix but here are the results: If you want to learn more: - - PS. thanks to for the help

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  13. 4. sij

    TFW your executable uses all your capabilities

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  14. proslijedio/la je Tweet
    30. pro 2019.

    This photo needs to be the front page of every paper in Australia for the first day of the new decade. Welcome to the 20’s, Australia.

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  15. proslijedio/la je Tweet
    30. pro 2019.

    Mi primer curso de Gatsby en español ya esta LIVE!!! se agradece los RTs, likes, shares y todo lo que se te ocurra! también feedback! 🙏🙏🙏

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  16. proslijedio/la je Tweet
    29. pro 2019.
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  17. 2. pro 2019.

    AoC solutions written in Nix: I will soon switch to haskell.

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  18. 2. pro 2019.

    Debugging nix...

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  19. 24. stu 2019.
    data HList (xs :: [Type]) where
  HNil  :: HList '[]
  HCons :: x -> HList xs -> HList (x ': xs)

data SNat (n :: Nat) where
  SZ ::           SNat  'Z
  SS :: SNat n -> SNat ('S n)

class HIndex (ts :: [Type]) (n :: Nat) (v :: Type) | ts n -> v where
  (!!!) :: HList ts -> SNat n -> v

instance HIndex (x ': xs) 'Z x where
  (!!!) (HCons x _) SZ = x

instance (HIndex xs n x) => HIndex (z ': xs) ('S n) x where
  (!...
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  20. 21. stu 2019.
    data (x :: a) :~: (y :: b) where
  Refl :: a :~: a
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