Add protein translation

config.json

@@ -1203,6 +1203,14 @@
           "result"
         ],
         "difficulty": 8
+      },
+      {
+        "slug": "protein-translation",
+        "name": "protein-translation",
+        "uuid": "c405e318-7101-4b4a-88b4-4099bbd2cd19",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
       }
     ]
   },

exercises/practice/protein-translation/.docs/instructions.md

@@ -0,0 +1,45 @@
+# Instructions
+
+Translate RNA sequences into proteins.
+
+RNA can be broken into three nucleotide sequences called codons, and then translated to a polypeptide like so:
+
+RNA: `"AUGUUUUCU"` => translates to
+
+Codons: `"AUG", "UUU", "UCU"`
+=> which become a polypeptide with the following sequence =>
+
+Protein: `"Methionine", "Phenylalanine", "Serine"`
+
+There are 64 codons which in turn correspond to 20 amino acids; however, all of the codon sequences and resulting amino acids are not important in this exercise.
+If it works for one codon, the program should work for all of them.
+However, feel free to expand the list in the test suite to include them all.
+
+There are also three terminating codons (also known as 'STOP' codons); if any of these codons are encountered (by the ribosome), all translation ends and the protein is terminated.
+
+All subsequent codons after are ignored, like this:
+
+RNA: `"AUGUUUUCUUAAAUG"` =>
+
+Codons: `"AUG", "UUU", "UCU", "UAA", "AUG"` =>
+
+Protein: `"Methionine", "Phenylalanine", "Serine"`
+
+Note the stop codon `"UAA"` terminates the translation and the final methionine is not translated into the protein sequence.
+
+Below are the codons and resulting Amino Acids needed for the exercise.
+
+| Codon              | Protein       |
+| :----------------- | :------------ |
+| AUG                | Methionine    |
+| UUU, UUC           | Phenylalanine |
+| UUA, UUG           | Leucine       |
+| UCU, UCC, UCA, UCG | Serine        |
+| UAU, UAC           | Tyrosine      |
+| UGU, UGC           | Cysteine      |
+| UGG                | Tryptophan    |
+| UAA, UAG, UGA      | STOP          |
+
+Learn more about [protein translation on Wikipedia][protein-translation].
+
+[protein-translation]: https://en.wikipedia.org/wiki/Translation_(biology)

exercises/practice/protein-translation/.meta/config.json

@@ -0,0 +1,18 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "src/ProteinTranslation.elm"
+    ],
+    "test": [
+      "tests/Tests.elm"
+    ],
+    "example": [
+      ".meta/src/ProteinTranslation.example.elm"
+    ]
+  },
+  "blurb": "Translate RNA sequences into proteins.",
+  "source": "Tyler Long"
+}

exercises/practice/protein-translation/.meta/src/ProteinTranslation.example.elm

@@ -0,0 +1,104 @@
+module ProteinTranslation exposing (proteins)
+
+import List
+import String
+
+
+proteins : String -> Result String (List String)
+proteins strand =
+    case splitIntoCodons strand of
+        [ "" ] ->
+            Ok []
+
+        codons ->
+            case processCodons [] codons of
+                Ok results ->
+                    Ok (List.reverse results)
+
+                Err err ->
+                    Err err
+
+
+splitIntoCodons : String -> List String
+splitIntoCodons strand =
+    if String.length strand > 3 then
+        String.left 3 strand :: splitIntoCodons (String.dropLeft 3 strand)
+
+    else
+        [ strand ]
+
+
+processCodons : List String -> List String -> Result String (List String)
+processCodons acc codons =
+    case codons of
+        [] ->
+            Ok acc
+
+        codon :: rest ->
+            case codonToProtein codon of
+                Ok "STOP" ->
+                    Ok acc
+
+                Ok protein ->
+                    processCodons (protein :: acc) rest
+
+                Err err ->
+                    Err err
+
+
+codonToProtein : String -> Result String String
+codonToProtein codon =
+    case codon of
+        "AUG" ->
+            Ok "Methionine"
+
+        "UUU" ->
+            Ok "Phenylalanine"
+
+        "UUC" ->
+            Ok "Phenylalanine"
+
+        "UUA" ->
+            Ok "Leucine"
+
+        "UUG" ->
+            Ok "Leucine"
+
+        "UCU" ->
+            Ok "Serine"
+
+        "UCC" ->
+            Ok "Serine"
+
+        "UCA" ->
+            Ok "Serine"
+
+        "UCG" ->
+            Ok "Serine"
+
+        "UAU" ->
+            Ok "Tyrosine"
+
+        "UAC" ->
+            Ok "Tyrosine"
+
+        "UGU" ->
+            Ok "Cysteine"
+
+        "UGC" ->
+            Ok "Cysteine"
+
+        "UGG" ->
+            Ok "Tryptophan"
+
+        "UAA" ->
+            Ok "STOP"
+
+        "UAG" ->
+            Ok "STOP"
+
+        "UGA" ->
+            Ok "STOP"
+
+        _ ->
+            Err "Invalid codon"

exercises/practice/protein-translation/elm.json

@@ -0,0 +1,29 @@
+{
+    "type": "application",
+    "source-directories": [
+        "src"
+    ],
+    "elm-version": "0.19.1",
+    "dependencies": {
+        "direct": {
+            "elm/core": "1.0.5",
+            "elm/json": "1.1.3",
+            "elm/parser": "1.1.0",
+            "elm/random": "1.0.0",
+            "elm/regex": "1.0.0",
+            "elm/time": "1.0.0"
+        },
+        "indirect": {}
+    },
+    "test-dependencies": {
+        "direct": {
+            "elm-explorations/test": "2.1.0",
+            "rtfeldman/elm-iso8601-date-strings": "1.1.4"
+        },
+        "indirect": {
+            "elm/bytes": "1.0.8",
+            "elm/html": "1.0.0",
+            "elm/virtual-dom": "1.0.3"
+        }
+    }
+}

exercises/practice/protein-translation/src/ProteinTranslation.elm

@@ -0,0 +1,6 @@
+module ProteinTranslation exposing (proteins)
+
+
+proteins : String -> Result String List todo
+proteins strand =
+    Debug.todo "Please implement proteins"