ruby - rna-transcription

ruby/rna-transcription/README.md

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+# RNA Transcription
+
+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`
+
+* * * *
+
+For installation and learning resources, refer to the
+[exercism help page](http://exercism.io/languages/ruby).
+
+For running the tests provided, you will need the Minitest gem. Open a
+terminal window and run the following command to install minitest:
+
+    gem install minitest
+
+If you would like color output, you can `require 'minitest/pride'` in
+the test file, or note the alternative instruction, below, for running
+the test file.
+
+Run the tests from the exercise directory using the following command:
+
+    ruby rna_transcription_test.rb
+
+To include color from the command line:
+
+    ruby -r minitest/pride rna_transcription_test.rb
+
+
+## Source
+
+Rosalind [http://rosalind.info/problems/rna](http://rosalind.info/problems/rna)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

ruby/rna-transcription/rna_transcription.rb

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+class Complement
+  RNA_MAP = {G: 'C', C: 'G', T: 'A', A: 'U'}
+
+  def self.of_dna(dna_strand)
+    dna_strand.chars.map{|n| RNA_MAP[n.to_sym]}.join
+  end
+end

ruby/rna-transcription/rna_transcription_test.rb

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+require 'minitest/autorun'
+require_relative 'rna_transcription'
+
+# Common test data version: 1.3.0 294c831
+class RnaTranscriptionTest < Minitest::Test
+  def test_empty_rna_sequence
+    # skip
+    assert_equal '', Complement.of_dna('')
+  end
+
+  def test_rna_complement_of_cytosine_is_guanine
+    # skip
+    assert_equal 'G', Complement.of_dna('C')
+  end
+
+  def test_rna_complement_of_guanine_is_cytosine
+    # skip
+    assert_equal 'C', Complement.of_dna('G')
+  end
+
+  def test_rna_complement_of_thymine_is_adenine
+    # skip
+    assert_equal 'A', Complement.of_dna('T')
+  end
+
+  def test_rna_complement_of_adenine_is_uracil
+    # skip
+    assert_equal 'U', Complement.of_dna('A')
+  end
+
+  def test_rna_complement
+    # skip
+    assert_equal 'UGCACCAGAAUU', Complement.of_dna('ACGTGGTCTTAA')
+  end
+end