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to RNA Transcription in the Go Track

Published at Feb 11 2019 · 0 comments
Test suite

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

Running the tests

To run the tests run the command go test from within the exercise directory.

If the test suite contains benchmarks, you can run these with the --bench and --benchmem flags:

go test -v --bench . --benchmem

Keep in mind that each reviewer will run benchmarks on a different machine, with different specs, so the results from these benchmark tests may vary.

Further information

For more detailed information about the Go track, including how to get help if you're having trouble, please visit the exercism.io Go language page.


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

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.


package strand

// Source: exercism/problem-specifications
// Commit: 294c831 rna-transcription: add test for empty sequence (#1266)
// Problem Specifications Version: 1.3.0

var rnaTests = []struct {
	description string
	input       string
	expected    string
	{"Empty RNA sequence",
		"", "",
	{"RNA complement of cytosine is guanine",
		"C", "G",
	{"RNA complement of guanine is cytosine",
		"G", "C",
	{"RNA complement of thymine is adenine",
		"T", "A",
	{"RNA complement of adenine is uracil",
		"A", "U",
	{"RNA complement",


package strand

import "testing"

func TestRNATranscription(t *testing.T) {
	for _, test := range rnaTests {
		if actual := ToRNA(test.input); actual != test.expected {
			t.Fatalf("FAIL: %s - ToRNA(%q): %q, expected %q",
				test.description, test.input, actual, test.expected)
		t.Logf("PASS: %s", test.description)

func BenchmarkRNATranscription(b *testing.B) {
	for i := 0; i < b.N; i++ {
		for _, test := range rnaTests {
package strand

var dnaToRnaMap = map[rune]rune{'G': 'C', 'C': 'G', 'T': 'A', 'A': 'U'}

// ToRNA converts DNA to RNA
func ToRNA(dna string) string {
	var rna = make([]rune, len(dna))
	for i, c := range dna {
		rna[i] = dnaToRnaMap[c]
	return string(rna)

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