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:
For installation and learning resources, refer to the Ruby resources page.
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:
To include color from the command line:
ruby -r minitest/pride rna_transcription_test.rb
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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
class Complement def self.of_dna(string) return '' if string.empty? string.tr('ACTG', 'UGAC') end end
A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.