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+# Nucleotide Count
+
+Given a single stranded DNA string, compute how many times each nucleotide occurs in the string.
+
+The genetic language of every living thing on the planet is DNA.
+DNA is a large molecule that is built from an extremely long sequence of individual elements called nucleotides.
+4 types exist in DNA and these differ only slightly and can be represented as the following symbols: 'A' for adenine, 'C' for cytosine, 'G' for guanine, and 'T' thymine.
+
+Here is an analogy:
+- twigs are to birds nests as
+- nucleotides are to DNA as
+- legos are to lego houses as
+- words are to sentences as...
+
+## Implementation
+
+You should define a custom type 'DNA' with a function 'Counts' that outputs two values: 
+
+- a frequency count for the given DNA strand
+- an error (if there are invalid nucleotides)
+
+Which is a good type for a DNA strand ? 
+
+Which is the best Go types to represent the output values ?
+
+Take a look at the test cases to get a hint about what could be the possible inputs.
+
+
+## note about the tests
+You may be wondering about the `cases_test.go` file. We explain it in the
+[leap exercise][leap-exercise-readme].
+
+[leap-exercise-readme]: https://github.com/exercism/go/blob/master/exercises/leap/README.md
+
+
+
+## Coding the solution
+
+Look for a stub file having the name nucleotide_count.go
+and place your solution code in that file.
+
+## 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](http://exercism.io/languages/go/resources).
+
+## Source
+
+The Calculating DNA Nucleotides_problem at Rosalind [http://rosalind.info/problems/dna/](http://rosalind.info/problems/dna/)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.