Merge pull request #391 from coriolinus/add-reverse-string-exercise

Add exercise reverse-string

Author: coriolinus

config.json

@@ -47,6 +47,18 @@
         "Mutable string"
       ]
     },
+    {
+      "uuid": "ecf8d1e3-9400-4d1a-8326-2e2820bce024",
+      "slug": "reverse-string",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 1,
+      "topics": [
+        "String",
+        "&str",
+        "Iterator"
+      ]
+    },
     {
       "uuid": "ee5048a7-c625-434d-a0a2-4fd54757ee02",
       "slug": "nth-prime",

exercises/reverse-string/.gitignore

@@ -0,0 +1,3 @@
+# Ignore Cargo.lock if creating a library
+# More information here http://doc.crates.io/guide.html#cargotoml-vs-cargolock
+Cargo.lock

exercises/reverse-string/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "reverse_string"
+version = "1.0.0"
+authors = ["Peter Goodspeed-Niklaus <[email protected]>"]
+
+[dependencies]

exercises/reverse-string/README.md

@@ -0,0 +1,46 @@
+# reverse-string
+
+Reverse a string
+
+For example:
+input: "cool"
+output: "looc"
+
+## 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 [Modules](https://doc.rust-lang.org/book/second-edition/ch07-00-modules.html) chapter if you
+haven't already, it will help you with organizing your files.
+
+## Feedback, Issues, Pull Requests
+
+The [exercism/rust](https://github.com/exercism/rust) 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/docs/blob/master/contributing-to-language-tracks/README.md).
+
+[help-page]: http://exercism.io/languages/rust
+[modules]: https://doc.rust-lang.org/book/second-edition/ch07-00-modules.html
+[cargo]: https://doc.rust-lang.org/book/second-edition/ch14-00-more-about-cargo.html
+
+## Source
+
+Introductory challenge to reverse an input string [https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb](https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/reverse-string/example.rs

@@ -0,0 +1,7 @@
+//! Example implementation for reverse-string
+
+pub fn reverse(input: &str) -> String {
+    let mut output = String::with_capacity(input.len());
+    output.extend(input.chars().rev());
+    output
+}

exercises/reverse-string/src/lib.rs

@@ -0,0 +1,3 @@
+pub fn reverse(_: &str) -> String {
+    unimplemented!()
+}

exercises/reverse-string/tests/reverse-string.rs

@@ -0,0 +1,57 @@
+//! Tests for reverse-string
+//!
+//! Generated by [script][script] using [canonical data][canonical-data]
+//!
+//! [script]: https://github.com/exercism/rust/blob/master/bin/init_exercise.py
+//! [canonical-data]: https://raw.githubusercontent.com/exercism/problem-specifications/master/exercises/reverse-string/canonical_data.json
+
+
+extern crate reverse_string;
+use reverse_string::*;
+
+/// Process a single test case for the property `reverse`
+fn process_reverse_case(input: &str, expected: &str) {
+    assert_eq!(
+        &reverse(input),
+        expected
+    )
+}
+
+
+#[test]
+/// empty string
+fn test_empty_string() {
+    process_reverse_case("", "");
+}
+
+
+#[test]
+#[ignore]
+/// a word
+fn test_a_word() {
+    process_reverse_case("robot", "tobor");
+}
+
+
+#[test]
+#[ignore]
+/// a capitalized word
+fn test_a_capitalized_word() {
+    process_reverse_case("Ramen", "nemaR");
+}
+
+
+#[test]
+#[ignore]
+/// a sentence with punctuation
+fn test_a_sentence_with_punctuation() {
+    process_reverse_case("I'm hungry!", "!yrgnuh m'I");
+}
+
+
+#[test]
+#[ignore]
+/// a palindrome
+fn test_a_palindrome() {
+    process_reverse_case("racecar", "racecar");
+}