reverse string exercise (#417)

* reverse string exercise

* 3 files for submission

* name updates

* more updates

* subject.matches is a function

* fixed array inputs

* modified matches

* spacing updates

* spacing updates #2

* spacing updates #3

* spacing updates #4

* config.json reverse string

* updated spec and example files

* updated spec and example files v2

* updated spec and example files v3

* updated spec and example files v4

* updated spec and example files v5

* updated spec and example files v6

Author: eliaahadi

config.json

@@ -35,6 +35,18 @@
       ],
       "uuid": "0c231a1c-55f7-47b6-8a54-ccae4ab0c65b"
     },
+    {
+      "core": false,
+      "difficulty": 2,
+      "slug": "reverse-string",
+      "topics": [
+        "loops",
+        "for",
+        "strings"
+      ],
+      "unlocked_by": "leap",
+      "uuid": "553a6be7-eecb-45dc-9cea-05126c525f1b"
+    },
     {
       "core": true,
       "difficulty": 1,

exercises/reverse-string/README.md

@@ -0,0 +1,36 @@
+# Reverse String
+
+For example:
+input: "cool"
+output: "looc"
+
+
+## Setup
+
+Go through the setup instructions for JavaScript to
+install the necessary dependencies:
+
+http://exercism.io/languages/javascript
+
+## Making the Test Suite Pass
+
+Execute the tests with:
+
+    jasmine <exercise-name>.spec.js
+
+Replace `<exercise-name>` with the name of the current exercise. E.g., to
+test the Reverse String exercise:
+
+    jasmine reverse-string.spec.js
+
+In many test suites all but the first test have been skipped.
+
+Once you get a test passing, you can unskip the next one by
+changing `xit` to `it`.
+
+## Source
+
+This is an exercise to introduce users to using Exercism and arrays and strings [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.js

@@ -0,0 +1,11 @@
+'use strict';
+
+function reverseString(string) {
+  var revString = '';
+  for (var i = string.length - 1; i >= 0; i--) {
+    revString += string[i];
+  }
+  return revString;
+}
+
+module.exports = reverseString;

exercises/reverse-string/reverse-string.spec.js

@@ -0,0 +1,33 @@
+var reverseString = require('./reverse-string');
+
+describe('ReverseString', function () {
+  it('empty string', function () {
+    var expected = '';
+    var actual = reverseString('');
+    expect(actual).toEqual(expected);
+  });
+
+  xit('a word', function () {
+    var expected = 'tobor';
+    var actual = reverseString('robot');
+    expect(actual).toEqual(expected);
+  });
+
+  xit('a capitalized word', function () {
+    var expected = 'nemaR';
+    var actual = reverseString('Ramen');
+    expect(actual).toEqual(expected);
+  });
+
+  xit('a sentence with punctuation', function () {
+    var expected = '!yrgnuh ma I';
+    var actual = reverseString('I am hungry!');
+    expect(actual).toEqual(expected);
+  });
+
+  xit('a palindrome', function () {
+    var expected = 'racecar';
+    var actual = reverseString('racecar');
+    expect(actual).toEqual(expected);
+  });
+});