String reversal

Author: Tittoh

README.md

@@ -5,4 +5,6 @@ A collection of some JS algorithms
 To run the tests for each algorithm, open up your terminal and navigate to the root directory of the codebase.
 Once inside, run the command below:
 
-```npm run test <folder name>```
+```npm run test <folder name>```
+
+1. String reversal

src/stringReversal/index.js

@@ -0,0 +1,8 @@
+// pick a solution and insert here to run the test.
+
+
+function reverseString(text) {
+    return text.split("").reduce((acc, char) => char + acc);
+}
+
+module.exports = reverseString

src/stringReversal/solutions.js

@@ -0,0 +1,48 @@
+// CHAINING BUILT-IN METHODS
+
+function reverseString(text) {
+    return text.split("").reverse().join("");
+}
+
+//  CHAINING BUILT-IN METHODS USING ES6
+
+function reverseString(text) {
+    return [...text].reverse().join('');
+}
+
+// USING A FOR LOOP
+
+function reverseString(text) {
+    let result = "";
+    for (let i = text.length - 1; i >= 0; i--) {
+        result += text[i];
+    }
+    return result;
+}
+
+// USING A FOR..OF LOOP IN ES6
+
+function reverseString(text) {
+    let result = "";
+    for (let char of text) {
+        result = char + result
+    }
+    return result;
+}
+
+// RECURSIVE METHOD
+
+function reverseString(text) {
+    if (text === "") {
+        return ""
+    } else {
+        return reverseString(text.substr(1)) + text[0]
+    }
+}
+
+
+// USING .REDUCE()
+
+function reverseString(text) {
+    return text.split("").reduce((acc, char) => char + acc);
+}

src/stringReversal/test.js

@@ -0,0 +1,17 @@
+const reverseString = require('./index')
+
+test('reverseString is a function', () => {
+  expect(typeof reverseString).toEqual('function');
+});
+
+test('reverses a string of text', () => {
+  expect(reverseString('aeiou')).toEqual('uoiea');
+});
+
+test('reverses a string containing numbers', () => {
+  expect(reverseString('123456789')).toEqual('987654321');
+});
+
+test('reverses a string containing mixed case characters', () => {
+  expect(reverseString('AsDfGhJkL')).toEqual('LkJhGfDsA');
+});