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Add Haskell snippets #109
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819f66a
add haskell language and some basic categories/snippets
ACR1209 331371e
added haskell append to file snippet
ACR1209 123c169
add Haskell snippet to check if a file exists
ACR1209 f6465f4
add Haskell snippet to find files in a directory by extension
ACR1209 db68080
add Haskell snippet to read a file in chunks by lines
ACR1209 c92a041
add Haskell snippet to write text to a file
ACR1209 2c31172
add Haskell monad category and snippet of using the Maybe monad
ACR1209 63ad862
add Haskell snippet for Either monad to handle errors in computations
ACR1209 f2ba64a
add Haskell snippet for Writer monad to accumulate logs alongside com...
ACR1209 7920cd5
add Haskell snippet for State monad to manage mutable state
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,23 @@ | ||
--- | ||
title: Writer Monad | ||
description: Using the Writer monad to accumulate logs or other outputs alongside a computation. | ||
author: ACR1209 | ||
tags: haskell, monads, writer, logs | ||
--- | ||
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||
```hs | ||
import Control.Monad.Writer | ||
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addAndLog :: Int -> Int -> Writer [String] Int | ||
addAndLog x y = do | ||
tell ["Adding " ++ show x ++ " and " ++ show y] | ||
return (x + y) | ||
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main :: IO () | ||
main = do | ||
let (result, logs) = runWriter $ do | ||
res1 <- addAndLog 3 5 | ||
addAndLog res1 1 | ||
print result -- Output: 9 | ||
print logs -- Output: ["Adding 3 and 5", "Adding 8 and 1"] | ||
``` |
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