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#haskelltil search results

chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
Jun 15, 2019

Did you know that you can enforce a type-variable as being "phantom" using constraints by requiring BOTH `Contravariant` AND `Functor` instances? If you can prove those constraints, you can use `phantom` to map either way! #HaskellTIL #HaskellTips

chrislpenner's tweet image. Did you know that you can enforce a type-variable as being "phantom" using constraints by requiring BOTH `Contravariant` AND `Functor` instances? If you can prove those constraints, you can use `phantom` to map either way! #HaskellTIL #HaskellTips
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
May 22, 2019

Testing out the idea of fighting Boolean Blindness in pattern-matching with 'as-patterns'; whaddya think? #Haskell #HaskellTIL

chrislpenner's tweet image. Testing out the idea of fighting Boolean Blindness in pattern-matching with 'as-patterns'; whaddya think? #Haskell #HaskellTIL
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
May 28, 2019

#HaskellTIL I always knew #haskell was great with JSON; but TIL about _JSON; it's a prism for converting between any JSON-like thing and it's haskell representation! By composing traversals you can crawl any structure with ease!

chrislpenner's tweet image. #HaskellTIL I always knew #haskell was great with JSON; but TIL about _JSON; it's a prism for converting between any JSON-like thing and it's haskell representation! By composing traversals you can crawl any structure with ease!
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
Jun 10, 2019

Had to subtract an offset from ALL nested Ints inside `[(Int, Int), [(Int, Int)])]` and on another occasion just `[(Int, Int)]`; so what do you do? BIPLATE! Lenses make you feel like a programming wizard. 🧙‍♂️ #HaskellTips #HaskellTIL #LensFriends

chrislpenner's tweet image. Had to subtract an offset from ALL nested Ints inside `[(Int, Int), [(Int, Int)])]` and on another occasion just `[(Int, Int)]`; so what do you do? BIPLATE! Lenses make you feel like a programming wizard. 🧙‍♂️ #HaskellTips #HaskellTIL #LensFriends
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
May 29, 2019

Yo; try using #DerivingStrategies to make your deriving clauses safer and easier to understand! Also they help prevent ambiguous derivations and make it clear whether you want the newtype or stock deriving behaviour! Absolute win! #HaskellTip #HaskellTIL

chrislpenner's tweet image. Yo; try using #DerivingStrategies to make your deriving clauses safer and easier to understand! Also they help prevent ambiguous derivations and make it clear whether you want the newtype or stock deriving behaviour! Absolute win! #HaskellTip #HaskellTIL
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
Jun 14, 2019

I've been experimenting with nested do-notation lately, mostly in tests. Helps provide logical test 'units' which help readability, and introduce new lexical scope so I don't have to think up 20 names for 'user'. Whaddya think? #HaskellTips #HaskellTIL

chrislpenner's tweet image. I've been experimenting with nested do-notation lately, mostly in tests. Helps provide logical test 'units' which help readability, and introduce new lexical scope so I don't have to think up 20 names for 'user'. Whaddya think? #HaskellTips #HaskellTIL
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Iceland_jack's profile picture. Haskell
Dad×2_jack
 @Iceland_jack
May 26, 2018

This works const_ :: (forall a. a -> b -> a) const_ = const but remove the parens and it fails #Haskell #HaskellTIL #HaskellWTF ghc.haskell.org/trac/ghc/ticke…

Iceland_jack's tweet image. This works const_ :: (forall a. a -> b -> a) const_ = const but remove the parens and it fails #Haskell #HaskellTIL #HaskellWTF ghc.haskell.org/trac/ghc/ticke…
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Iceland_jack's profile picture. Haskell
Dad×2_jack
 @Iceland_jack
Apr 16, 2019

#HaskellTIL, useful trick for bringing type variables into scope >> :set -XScopedTypeVariables -XPartialTypeSignatures >> :set -Wno-partial-type-signatures >> :t \(_::_ a) -> read "hi" :: a .. :: Read a => w a -> a unlike Proxy it can bring about multiple \(_::_ a b c)

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Iceland_jack's profile picture. Haskell
Dad×2_jack
 @Iceland_jack
Jul 4, 2018

upcoming #DerivingVia can derive any (looping) instance of a type via itself, I use this to quickly get functionality data A a .. deriving (Functor, Applicative, Monad) via A #HaskellTIL #Haskell

Feature %58.1
Bug %41.9

43 vote · Final results

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No results for "#haskelltil"
No results for "#haskelltil"
chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
May 22, 2019

Testing out the idea of fighting Boolean Blindness in pattern-matching with 'as-patterns'; whaddya think? #Haskell #HaskellTIL

chrislpenner's tweet image. Testing out the idea of fighting Boolean Blindness in pattern-matching with 'as-patterns'; whaddya think? #Haskell #HaskellTIL
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
Jun 15, 2019

Did you know that you can enforce a type-variable as being "phantom" using constraints by requiring BOTH `Contravariant` AND `Functor` instances? If you can prove those constraints, you can use `phantom` to map either way! #HaskellTIL #HaskellTips

chrislpenner's tweet image. Did you know that you can enforce a type-variable as being "phantom" using constraints by requiring BOTH `Contravariant` AND `Functor` instances? If you can prove those constraints, you can use `phantom` to map either way! #HaskellTIL #HaskellTips
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
Jun 14, 2019

I've been experimenting with nested do-notation lately, mostly in tests. Helps provide logical test 'units' which help readability, and introduce new lexical scope so I don't have to think up 20 names for 'user'. Whaddya think? #HaskellTips #HaskellTIL

chrislpenner's tweet image. I've been experimenting with nested do-notation lately, mostly in tests. Helps provide logical test 'units' which help readability, and introduce new lexical scope so I don't have to think up 20 names for 'user'. Whaddya think? #HaskellTips #HaskellTIL
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
May 28, 2019

#HaskellTIL I always knew #haskell was great with JSON; but TIL about _JSON; it's a prism for converting between any JSON-like thing and it's haskell representation! By composing traversals you can crawl any structure with ease!

chrislpenner's tweet image. #HaskellTIL I always knew #haskell was great with JSON; but TIL about _JSON; it's a prism for converting between any JSON-like thing and it's haskell representation! By composing traversals you can crawl any structure with ease!
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
May 29, 2019

Yo; try using #DerivingStrategies to make your deriving clauses safer and easier to understand! Also they help prevent ambiguous derivations and make it clear whether you want the newtype or stock deriving behaviour! Absolute win! #HaskellTip #HaskellTIL

chrislpenner's tweet image. Yo; try using #DerivingStrategies to make your deriving clauses safer and easier to understand! Also they help prevent ambiguous derivations and make it clear whether you want the newtype or stock deriving behaviour! Absolute win! #HaskellTip #HaskellTIL
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chrislpenner's profile picture. he/him | Optics By Example: https://t.co/WC3SHRY4Kl | Cunningham's law made manifest. | Building @unisonweb
Chris Penner
 @chrislpenner
Jun 10, 2019

Had to subtract an offset from ALL nested Ints inside `[(Int, Int), [(Int, Int)])]` and on another occasion just `[(Int, Int)]`; so what do you do? BIPLATE! Lenses make you feel like a programming wizard. 🧙‍♂️ #HaskellTips #HaskellTIL #LensFriends

chrislpenner's tweet image. Had to subtract an offset from ALL nested Ints inside `[(Int, Int), [(Int, Int)])]` and on another occasion just `[(Int, Int)]`; so what do you do? BIPLATE! Lenses make you feel like a programming wizard. 🧙‍♂️ #HaskellTips #HaskellTIL #LensFriends
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Iceland_jack's profile picture. Haskell
Dad×2_jack
 @Iceland_jack
May 26, 2018

This works const_ :: (forall a. a -> b -> a) const_ = const but remove the parens and it fails #Haskell #HaskellTIL #HaskellWTF ghc.haskell.org/trac/ghc/ticke…

Iceland_jack's tweet image. This works const_ :: (forall a. a -> b -> a) const_ = const but remove the parens and it fails #Haskell #HaskellTIL #HaskellWTF ghc.haskell.org/trac/ghc/ticke…
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