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Haskell Tips @HaskellTips

Tips, tricks and hacks by @jfischoff Joined January 2014
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Haskell Tips retweeted
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Chris Penner @chrislpenner

6 years ago

So apparently a lot of peeps still don't know you can avoid pressing 'up' a billion times going through :reload's in GHCi by adding this to your `~/.haskeline` file: historyDuplicates: IgnoreAll Have fun.

Haskell Tips retweeted
GabriellaG439 Profile Picture

gabby @GabriellaG439

8 years ago

Open this page: hackage.haskell.org/package/lens ... and then type 's' to open a quick search for any exported symbols in lens

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Haskell Tips @HaskellTips

8 years ago

Usually one starts with the first error and works forward. With the default setting one has to scroll up over and over again.

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Haskell Tips @HaskellTips

8 years ago

Use `ghci -freverse-errors` or `stack repl --ghc-options=-freverse-errors` to reverse the error order; see the first error with no scrolling

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Haskell Tips @HaskellTips

8 years ago

() does not add a “null” value to every type, hell no; () is a “dull” value in a type of its own: () - @pigworker personal.cis.strath.ac.uk/conor.mcbride/…

Haskell Tips retweeted
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austin 🇵🇸 @stdlib

8 years ago

WARNING: advanced haskell tips

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Haskell Tips @HaskellTips

8 years ago

Avoid lengthy computation in a exception handler with `catch`. The exception handler has async exceptions masked: hackage.haskell.org/package/base-4…

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Haskell Tips @HaskellTips

8 years ago

Careful with your foralls data A = forall a. A {x :: a} -- existential quantification data A = A {x :: forall a. a} -- polymorphic component

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Haskell Tips @HaskellTips

8 years ago

YMMV

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Jacob Stanley @jacobstanley

8 years ago

YMMV

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Haskell Tips @HaskellTips

8 years ago

Use the '+RTS -qg' flag to speed up your programs. /ht @stdlib inner-haven.net/posts/2017-05-…

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Haskell Tips @HaskellTips

8 years ago

IORef can't unbox primitives, but URef, Ptr and others can and are thus faster: medium.com/@jonathangfisc…

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Haskell Tips @HaskellTips

8 years ago

class ToB a where to∷a → B class FromB a where from∷Parser a -- vs class Bable a where to∷a → B from∷Parser a medium.com/@jonathangfisc…

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Haskell Tips @HaskellTips

8 years ago

(Pattern Matching : Data Constructors :: Type Class Instance Selection : Type Constructors) / ordering medium.com/@jonathangfisc…

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Haskell Tips @HaskellTips

9 years ago

If you are using `putStr` you probably want to > import System.IO > hSetBuffering stdout NoBuffering

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Haskell Tips @HaskellTips

9 years ago

Data.List.\\ doesn't remove duplicates: > import Data.List > [1, 1, 2] \\ [1, 2] [1] For set difference use Data.Set.\\

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Haskell Tips @HaskellTips

9 years ago

When in doubt, install `happy`.

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Haskell Tips @HaskellTips

10 years ago

If you want to run a function from the command line: > echo 'foo "hello"' | ghci src/File.hs If you want to run `main`: > runhaskell Main.hs

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Haskell Tips @HaskellTips

10 years ago

To list all @Hackage packages > cabal list With just the word "lens" > cabal list lens For a summary of the package 'lens' > cabal info lens

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Haskell Tips @HaskellTips

10 years ago

A great way to get #haskell tips: reddit.com/r/haskelltil/ ht @deech

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