HaskSheet

codingconventions - [Class declaration]

f2b216 (f2b216@undisclosed.example.com) — 2024-06-04T06:36:26+00:00

Coding conventions * Derived from * Haskell - Programming guidelines * Haskell Style Guide * Cross-link * Haddock examples General rules Line length For source code, the line length is up to 80 characters, at the maximum. * Example: ------------------------------------------------------------------------------ |---... ... instance Formatting a => Formatting (Ds.Tree a) where format t = format' (Indent []) t where format' :: Formatting a => Indent -> (Ds.Tree…

start

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T22:48:25+00:00

HaskSheet This DokuWiki is my personal cheat sheet reagarding the Haskel programming language, tools and its packages (libraries). You are welcome, if this is also useful for you, and if you want to participate. Please, find the discussion boxes at the end.

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f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T22:28:43+00:00

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f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T22:19:31+00:00

buildingapackagelocally

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T21:13:47+00:00

Building a package locally from source using "stack" Use case One wants to use the original sources of a package (of the Stackage/Hackage repository), to modify it's files locally, and in order to investigate or contribute to improvement. Procedures

listinginstalledpackages

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T21:13:26+00:00

Listing installed packages using stack * displays the currently installed packages * for each of the databases known to ghc-pkg * includes the global database * user’s local database * documented here Glasgow Haskell Compiler - Package management (the ghc-pkg command) * command line: * stack exec ghc-pkg -- list

lateststackresolver

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T21:12:42+00:00

Latest stack resolver * latest stack resolver can be fond here: Stackage * can be set in the stack.yaml as shown below after resolver: * # This file was automatically generated by 'stack init' # # ... resolver: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/15.yaml # ... packages: - . # ... # extra-deps: [] # ... # flags: {} # ... # extra-package-dbs: [] # ... # compiler-check: newer-minor

testframework

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T21:10:38+00:00

Test framework setup Preconditions / configuration * Installations: * The Haskell Stack * resolver: lts-17.5 * Haskel project has been setup with stack * stack new Steps All to to be reworked for Test.Tasty. * Adapt package.yaml by adding the packages

verificationandvalidation

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T21:09:35+00:00

Verification and Validation Plan The goals of this plan is to document all steps to release a product like “genc³” as an online-product aiming to satisfiy the endusers expectations regarding download, installation, use, and further information.

haddockexamples

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T20:59:02+00:00

Haddock examples Markups Paragraphs One or more blank lines separates two paragraphs in a documentation comment. Special characters The following characters have special meanings in documentation comments: \, /, ', `, “, @, <. To insert a literal occurrence of one of these special characters, precede it with a backslash (\).

testingconventions

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T20:58:44+00:00

Testing conventions Setup with stack package.yaml * package.yaml: ... tests: Test4-test: main: Spec.hs source-dirs: test ghc-options: - -threaded - -rtsopts - -with-rtsopts=-N dependencies: - Test4 - tasty - tasty-quickcheck - tasty-hunit

equivalentfunctioncompositions

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T20:57:16+00:00

Equivalent function compositions * assertion: f1 (f2 . f3) equals (f1 . (f2 . )) f3 * example code: main :: IO () main = do print $ f f1' f2' f3' 6.4 print $ f' f1' f2' f3' 6.4 print $ f'' f1' f2' f3' 6.4 f :: ((Integer -> String) -> Double -> [String]) -> (Int -> String) -> (Integer -> Int) -> Double -> [String] f f1 f2 f3 x' = f1 (f2 . f3) x' f' :: ((Integer -> String) -> Double -> [String]) -> (Int -> String) -> (Integer -> Int) -> Double -> [String] f'…

parametrictypeforanintermediatevaluewhencombiningfunctions

f2b216 (f2b216@undisclosed.example.com) — 2024-06-02T20:56:09+00:00

Parametric type for an intermediate value when combining functions * example with the folling problem(s): * function buildNRender has an ambigious intermediate parametric type * the type of buildNRender has no parametric type g involved at all

typeclassopedia-diagram.png - created

f2b216 (f2b216@undisclosed.example.com) — 2024-01-07T11:51:54+00:00

preludetypeclasses.png - created

f2b216 (f2b216@undisclosed.example.com) — 2021-04-10T17:47:12+00:00

preludetypeclasses.png - created

f2b216 (f2b216@undisclosed.example.com) — 2021-04-10T10:18:36+00:00

haskelltypeclasses.gif

f2b216 (f2b216@undisclosed.example.com) — 2021-04-10T10:09:11+00:00

heapconsumptionfoldlfronnoncommutativeop.png - created

f2b216 (f2b216@undisclosed.example.com) — 2021-04-08T15:50:48+00:00

heapconsumptionfoldronnoncommutativeop.png - created

f2b216 (f2b216@undisclosed.example.com) — 2021-04-08T15:49:31+00:00

heapconsumptionfoldloninfitelist.png - created

f2b216 (f2b216@undisclosed.example.com) — 2021-04-06T19:11:05+00:00