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subtle-supernova's solution

to RNA Transcription in the OCaml Track

Published at Jun 08 2020 · 0 comments
Instructions
Test suite
Solution

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

Getting Started

  1. Install the Exercism CLI.

  2. Install OCaml.

  3. For library documentation, follow Useful OCaml resources.

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Source

Hyperphysics http://hyperphysics.phy-astr.gsu.edu/hbase/Organic/transcription.html

test.ml

open Base
open OUnit2

let char_of_variant = function
  | `A -> 'A' | `C -> 'C' | `G -> 'G' | `T -> 'T' | `U -> 'U'
let printer l = List.map ~f:char_of_variant l |> String.of_char_list
let ae exp got _test_ctxt = assert_equal ~printer exp got

let tests =
  ["transcribes empty list">::
   ae [] (Rna_transcription.to_rna []);
   "transcribes cytidine">::
   ae [`G] (Rna_transcription.to_rna [`C]);
   "transcribes guanosine">::
   ae [`C] (Rna_transcription.to_rna [`G]);
   "transcribes adenosie">::
   ae [`U] (Rna_transcription.to_rna [`A]);
   "transcribes thymidine">::
   ae [`A] (Rna_transcription.to_rna [`T]);
   "transcribes multiple">::
   ae [`U; `G; `C; `A; `C; `C; `A; `G; `A; `A; `U; `U]
     (Rna_transcription.to_rna [`A; `C; `G; `T; `G; `G; `T; `C; `T; `T; `A; `A])
  ]

let () =
  run_test_tt_main ("rna-transcription tests" >::: tests)
type dna = [ `A | `C | `G | `T ]
type rna = [ `A | `C | `G | `U ]

let translate dna =
  match dna with
    `G -> `C
    | `C -> `G
    | `T -> `A
    | `A -> `U

let to_rna dna_lst =
  List.map translate dna_lst

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