exercism/elixir/protein-translation

Protein Translation

Translate RNA sequences into proteins.

RNA can be broken into three nucleotide sequences called codons, and then translated to a polypeptide like so:

RNA: "AUGUUUUCU" => translates to

Codons: "AUG", "UUU", "UCU" => which become a polypeptide with the following sequence =>

Protein: "Methionine", "Phenylalanine", "Serine"

There are 64 codons which in turn correspond to 20 amino acids; however, all of the codon sequences and resulting amino acids are not important in this exercise. If it works for one codon, the program should work for all of them. However, feel free to expand the list in the test suite to include them all.

There are also three terminating codons (also known as 'STOP' codons); if any of these codons are encountered (by the ribosome), all translation ends and the protein is terminated.

All subsequent codons after are ignored, like this:

RNA: "AUGUUUUCUUAAAUG" =>

Codons: "AUG", "UUU", "UCU", "UAG", "AUG" =>

Protein: "Methionine", "Phenylalanine", "Serine"

Note the stop codon terminates the translation and the final methionine is not translated into the protein sequence.

Below are the codons and resulting Amino Acids needed for the exercise.

Codon	Protein
AUG	Methionine
UUU, UUC	Phenylalanine
UUA, UUG	Leucine
UCU, UCC, UCA, UCG	Serine
UAU, UAC	Tyrosine
UGU, UGC	Cysteine
UGG	Tryptophan
UAA, UAG, UGA	STOP

Learn more about protein translation on Wikipedia

Running tests

Execute the tests with:

$ elixir protein_translation_test.exs

Pending tests

In the test suites, all but the first test have been skipped.

Once you get a test passing, you can unskip the next one by commenting out the relevant @tag :pending with a # symbol.

For example:

# @tag :pending
test "shouting" do
  assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
end

Or, you can enable all the tests by commenting out the ExUnit.configure line in the test suite.

# ExUnit.configure exclude: :pending, trace: true

For more detailed information about the Elixir track, please see the help page.

Source

Tyler Long

Submitting Incomplete Solutions

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