✅ haskell: rna-transcription

haskell/rna-transcription/HELP.md

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+# Help
+
+## Running the tests
+
+To run the test suite, execute the following command:
+
+```bash
+stack test
+```
+
+#### If you get an error message like this...
+
+```
+No .cabal file found in directory
+```
+
+or
+
+```
+RedownloadInvalidResponse Request {
+...
+}
+ "/home/username/.stack/build-plan/lts-xx.yy.yaml" (Response {responseStatus = Status {statusCode = 404, statusMessage = "Not Found"},
+```
+
+You are probably running an old stack version and need
+to upgrade it. Try running:
+
+```bash
+stack upgrade
+```
+
+Or see other options for upgrading at [Stack documentation](https://docs.haskellstack.org/en/stable/install_and_upgrade/#upgrade).
+
+#### Otherwise, if you get an error message like this...
+
+```
+No compiler found, expected minor version match with...
+Try running "stack setup" to install the correct GHC...
+```
+
+Just do as it says and it will download and install
+the correct compiler version:
+
+```bash
+stack setup
+```
+
+
+If you want to play with your solution in GHCi, just run the command:
+
+```bash
+stack ghci
+```
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/DNA.hs` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Haskell track's documentation](https://exercism.org/docs/tracks/haskell)
+- [Exercism's support channel on gitter](https://gitter.im/exercism/support)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+## Getting Started
+
+Please refer to the [installation](https://exercism.io/tracks/haskell/installation)
+and [learning](https://exercism.io/tracks/haskell/learning) help pages.
+
+## Feedback, Issues, Pull Requests
+
+The [exercism/haskell](https://github.com/exercism/haskell) repository on
+GitHub is the home for all of the Haskell exercises.
+
+If you have feedback about an exercise, or want to help implementing a new
+one, head over there and create an issue.  We'll do our best to help you!
+{{ with .Spec.Credits }}

haskell/rna-transcription/README.md

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+# Rna Transcription
+
+Welcome to Rna Transcription on Exercism's Haskell Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a DNA strand, return its RNA complement (per RNA transcription).
+
+Both DNA and RNA strands are a sequence of nucleotides.
+
+The four nucleotides found in DNA are adenine (**A**), cytosine (**C**),
+guanine (**G**) and thymine (**T**).
+
+The four nucleotides found in RNA are adenine (**A**), cytosine (**C**),
+guanine (**G**) and uracil (**U**).
+
+Given a DNA strand, its transcribed RNA strand is formed by replacing
+each nucleotide with its complement:
+
+* `G` -> `C`
+* `C` -> `G`
+* `T` -> `A`
+* `A` -> `U`
+
+Given invalid output, your program should return the first invalid character.
+
+## Source
+
+### Created by
+
+- @etrepum
+
+### Contributed to by
+
+- @b-mehta
+- @eijynagai
+- @iHiD
+- @kytrinyx
+- @MazeChaZer
+- @petertseng
+- @ppartarr
+- @rbasso
+- @rpottsoh
+- @samjonester
+- @sshine
+- @tejasbubane
+
+### Based on
+
+Hyperphysics - http://hyperphysics.phy-astr.gsu.edu/hbase/Organic/transcription.html

haskell/rna-transcription/examples/success-standard/package.yaml

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+name: rna-transcription
+
+dependencies:
+  - base
+
+library:
+  exposed-modules: DNA
+  source-dirs: src
+  dependencies:
+    - containers
+
+tests:
+  test:
+    main: Tests.hs
+    source-dirs: test
+    dependencies:
+      - rna-transcription
+      - hspec

haskell/rna-transcription/package.yaml

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+name: rna-transcription
+version: 1.3.0.10
+
+dependencies:
+  - base
+
+library:
+  exposed-modules: DNA
+  source-dirs: src
+  ghc-options: -Wall
+  # dependencies:
+  # - foo       # List here the packages you
+  # - bar       # want to use in your solution.
+
+tests:
+  test:
+    main: Tests.hs
+    source-dirs: test
+    dependencies:
+      - rna-transcription
+      - hspec

haskell/rna-transcription/src/DNA.hs

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+module DNA (toRNA) where
+
+toRNA :: String -> Either Char String
+toRNA xs = traverse fromDNA xs
+
+fromDNA :: Char -> Either Char Char
+fromDNA c
+  | c == 'G' = Right 'C'
+  | c == 'C' = Right 'G'
+  | c == 'T' = Right 'A'
+  | c == 'A' = Right 'U'
+  | otherwise = Left c

haskell/rna-transcription/stack.yaml

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+resolver: lts-16.21

haskell/rna-transcription/test/Tests.hs

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+{-# LANGUAGE RecordWildCards #-}
+
+import Data.Foldable     (for_)
+import Test.Hspec        (Spec, describe, it, shouldBe)
+import Test.Hspec.Runner (configFastFail, defaultConfig, hspecWith)
+
+import DNA (toRNA)
+
+main :: IO ()
+main = hspecWith defaultConfig {configFastFail = True} specs
+
+specs :: Spec
+specs = describe "toRNA" $ for_ cases test
+  where
+    test Case{..} = it description $ toRNA dna `shouldBe` expected
+
+data Case = Case { description :: String
+                 , dna         :: String
+                 , expected    :: Either Char String
+                 }
+
+cases :: [Case]
+cases = [ Case { description = "Empty RNA sequence"
+               , dna         = ""
+               , expected    = Right ""
+               }
+        , Case { description = "RNA complement of cytosine is guanine"
+               , dna         = "C"
+               , expected    = Right "G"
+               }
+        , Case { description = "RNA complement of guanine is cytosine"
+               , dna         = "G"
+               , expected    = Right "C"
+               }
+        , Case { description = "RNA complement of thymine is adenine"
+               , dna         = "T"
+               , expected    = Right "A"
+               }
+        , Case { description = "RNA complement of adenine is uracil"
+               , dna         = "A"
+               , expected    = Right "U"
+               }
+        , Case { description = "RNA complement"
+               , dna         = "ACGTGGTCTTAA"
+               , expected    = Right "UGCACCAGAAUU"
+               }
+        , Case { description = "correctly handles invalid input (RNA instead of DNA)"
+               , dna         = "U"
+               , expected    = Left 'U'
+               }
+        , Case { description = "correctly handles completely invalid DNA input"
+               , dna         = "XXX"
+               , expected    = Left 'X'
+               }
+        , Case { description = "correctly handles partially invalid DNA input"
+               , dna         = "ACGTXXXCTTAA"
+               , expected    = Left 'X'
+               }
+        ]
+
+-- b02fedbb302892cb17dfa608df335b530ae2bc92