Rust - WIP hamming

rust/hamming/.gitignore

@@ -0,0 +1,7 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here http://doc.crates.io/guide.html#cargotoml-vs-cargolock
+Cargo.lock

rust/hamming/Cargo.toml

@@ -0,0 +1,3 @@
+[package]
+name = "hamming"
+version = "0.0.0"

rust/hamming/README.md

@@ -0,0 +1,75 @@
+# Hamming
+
+Calculate the Hamming difference between two DNA strands.
+
+A mutation is simply a mistake that occurs during the creation or
+copying of a nucleic acid, in particular DNA. Because nucleic acids are
+vital to cellular functions, mutations tend to cause a ripple effect
+throughout the cell. Although mutations are technically mistakes, a very
+rare mutation may equip the cell with a beneficial attribute. In fact,
+the macro effects of evolution are attributable by the accumulated
+result of beneficial microscopic mutations over many generations.
+
+The simplest and most common type of nucleic acid mutation is a point
+mutation, which replaces one base with another at a single nucleotide.
+
+By counting the number of differences between two homologous DNA strands
+taken from different genomes with a common ancestor, we get a measure of
+the minimum number of point mutations that could have occurred on the
+evolutionary path between the two strands.
+
+This is called the 'Hamming distance'.
+
+It is found by comparing two DNA strands and counting how many of the
+nucleotides are different from their equivalent in the other string.
+
+    GAGCCTACTAACGGGAT
+    CATCGTAATGACGGCCT
+    ^ ^ ^  ^ ^    ^^
+
+The Hamming distance between these two DNA strands is 7.
+
+# Implementation notes
+
+The Hamming distance is only defined for sequences of equal length. This means
+that based on the definition, each language could deal with getting sequences
+of equal length differently.
+
+## Rust Installation
+
+Refer to the [exercism help page][help-page] for Rust installation and learning
+resources.
+
+## Writing the Code
+
+Execute the tests with:
+
+```bash
+$ cargo test
+```
+
+All but the first test have been ignored.  After you get the first test to
+pass, remove the ignore flag (`#[ignore]`) from the next test and get the tests
+to pass again.  The test file is located in the `tests` directory.   You can
+also remove the ignore flag from all the tests to get them to run all at once
+if you wish.
+
+Make sure to read the [Crates and Modules](https://doc.rust-lang.org/stable/book/crates-and-modules.html) chapter if you
+haven't already, it will help you with organizing your files.
+
+## Feedback, Issues, Pull Requests
+
+The [exercism/xrust](https://github.com/exercism/xrust) repository on GitHub is the home for all of the Rust exercises. If you have feedback about an exercise, or want to help implement new exercises, head over there and create an issue. Members of the [rust track team](https://github.com/orgs/exercism/teams/rust) are happy to help!
+
+If you want to know more about Exercism, take a look at the [contribution guide](https://github.com/exercism/x-common/blob/master/CONTRIBUTING.md).
+
+[help-page]: http://exercism.io/languages/rust
+[crates-and-modules]: http://doc.rust-lang.org/stable/book/crates-and-modules.html
+
+## Source
+
+The Calculating Point Mutations problem at Rosalind [http://rosalind.info/problems/hamm/](http://rosalind.info/problems/hamm/)
+
+## Submitting Incomplete Problems
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.
+

rust/hamming/tests/hamming.rs

@@ -0,0 +1,42 @@
+extern crate hamming;
+
+#[test]
+fn test_no_difference_between_empty_strands() {
+    assert_eq!(hamming::hamming_distance("", "").unwrap(), 0);
+}
+
+#[test]
+#[ignore]
+fn test_no_difference_between_identical_strands() {
+    assert_eq!(hamming::hamming_distance("GGACTGA", "GGACTGA").unwrap(), 0);
+}
+
+#[test]
+#[ignore]
+fn test_complete_hamming_distance_in_small_strand() {
+    assert_eq!(hamming::hamming_distance("ACT", "GGA").unwrap(), 3);
+}
+
+#[test]
+#[ignore]
+fn test_small_hamming_distance_in_the_middle_somewhere() {
+    assert_eq!(hamming::hamming_distance("GGACG", "GGTCG").unwrap(), 1);
+}
+
+#[test]
+#[ignore]
+fn test_larger_distance() {
+    assert_eq!(hamming::hamming_distance("ACCAGGG", "ACTATGG").unwrap(), 2);
+}
+
+#[test]
+#[ignore]
+fn test_first_string_is_longer() {
+    assert!(hamming::hamming_distance("AAA", "AA").is_err());
+}
+
+#[test]
+#[ignore]
+fn test_second_string_is_longer() {
+    assert!(hamming::hamming_distance("A", "AA").is_err());
+}