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ruby/protein-translation: 1st iteration
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| =begin | ||
| Write your code for the 'Protein Translation' exercise in this file. Make the tests in | ||
| `protein_translation_test.rb` pass. | ||
| # frozen_string_literal: false | ||
|
|
||
| To get started with TDD, see the `README.md` file in your | ||
| `ruby/protein-translation` directory. | ||
| =end | ||
| # https://exercism.org/tracks/ruby/exercises/protein-translation | ||
| # Protein Translation exercise | ||
| module Translation | ||
| CODON_LENGTH = 3 | ||
|
|
||
| def self.to_protein(codon) | ||
| codon2protein = { | ||
| 'AUG' => 'Methionine', | ||
| 'UUU' => 'Phenylalanine', | ||
| 'UUC' => 'Phenylalanine', | ||
| 'UUA' => 'Leucine', | ||
| 'UUG' => 'Leucine', | ||
| 'UCU' => 'Serine', | ||
| 'UCC' => 'Serine', | ||
| 'UCA' => 'Serine', | ||
| 'UCG' => 'Serine', | ||
| 'UAU' => 'Tyrosine', | ||
| 'UAC' => 'Tyrosine', | ||
| 'UGU' => 'Cysteine', | ||
| 'UGC' => 'Cysteine', | ||
| 'UGG' => 'Tryptophan', | ||
| 'UAA' => 'STOP', | ||
| 'UAG' => 'STOP', | ||
| 'UGA' => 'STOP' | ||
| } | ||
|
|
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| raise InvalidCodonError, 'invalid codon' unless codon2protein.key?(codon) | ||
|
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| codon2protein[codon] | ||
| end | ||
|
|
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| def self.of_rna(rna_sequence) | ||
| return [] if rna_sequence.empty? | ||
|
|
||
| has_stop = false | ||
| codons = [] | ||
| rna_sequence.scan(/([A-Z]{3})/) do |match| | ||
| codon = match[0] | ||
|
|
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| if %w[UAA UAG UGA].include?(codon) | ||
| has_stop = true | ||
| break | ||
| end | ||
|
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| codons.push(codon) | ||
| end | ||
|
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| raise InvalidCodonError, 'invalid codon' if !has_stop && rna_sequence.length.modulo(CODON_LENGTH).positive? | ||
|
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| codons.map { |codon| to_protein(codon) } | ||
| end | ||
| end | ||
|
|
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| # InvalidCodonError exception | ||
| class InvalidCodonError < StandardError | ||
| attr_reader :data | ||
|
|
||
| def initialize(data) | ||
| super | ||
| @data = data | ||
| end | ||
| end |
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