65 lines
1.8 KiB
Markdown
65 lines
1.8 KiB
Markdown
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# Nucleotide Count
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Welcome to Nucleotide Count on Exercism's Elixir Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Instructions
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Each of us inherits from our biological parents a set of chemical instructions known as DNA that influence how our bodies are constructed.
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All known life depends on DNA!
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> Note: You do not need to understand anything about nucleotides or DNA to complete this exercise.
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DNA is a long chain of other chemicals and the most important are the four nucleotides, adenine, cytosine, guanine and thymine.
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A single DNA chain can contain billions of these four nucleotides and the order in which they occur is important!
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We call the order of these nucleotides in a bit of DNA a "DNA sequence".
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We represent a DNA sequence as an ordered collection of these four nucleotides and a common way to do that is with a string of characters such as "ATTACG" for a DNA sequence of 6 nucleotides.
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'A' for adenine, 'C' for cytosine, 'G' for guanine, and 'T' for thymine.
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Given a string representing a DNA sequence, count how many of each nucleotide is present.
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If the string contains characters that aren't A, C, G, or T then it is invalid and you should signal an error.
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For example:
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```text
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"GATTACA" -> 'A': 3, 'C': 1, 'G': 1, 'T': 2
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"INVALID" -> error
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```
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## Elixir-specific changes
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Error handling has been omitted from this exercise for the sake of simplicity.
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## Source
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### Created by
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- @rubysolo
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### Contributed to by
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- @andrewsardone
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- @angelikatyborska
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- @Cohen-Carlisle
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- @dalexj
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- @dantswain
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- @devonestes
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- @henrik
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- @jinyeow
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- @kytrinyx
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- @leikind
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- @lpil
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- @MarcosX
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- @neenjaw
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- @nimser
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- @parkerl
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- @rud
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- @sotojuan
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- @Teapane
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- @toriejw
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- @waiting-for-dev
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### Based on
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The Calculating DNA Nucleotides_problem at Rosalind - https://rosalind.info/problems/dna/
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