Vowels counter

Author: Tittoh

README.md

@@ -8,3 +8,4 @@ Once inside, run the command below:
 ```npm run test <folder name>```
 
 1. String reversal
+2. Vowels counter

src/vowelsCounter/index.js

@@ -0,0 +1,17 @@
+// pick a solution and insert here to run the test.
+
+
+function vowelsCounter(text) {
+    // Search text with Regex and store all matching instances
+    let matchingInstances = text.match(/[aeiou]/gi);
+
+    // Check if matching instances exist then calculate length
+    if (matchingInstances) {
+        // Return number of vowels
+        return matchingInstances.length
+    } else {
+        return 0
+    }
+}
+
+module.exports = vowelsCounter;

src/vowelsCounter/solutions.js

@@ -0,0 +1,34 @@
+// ITERATIVE APPROACH
+const vowels = ["a", "e", "i", "o", "u"]
+
+
+function vowelsCounter(text) {
+    // Initialize counter
+    let counter = 0;
+
+
+    // Loop through text to test if each character is a vowel
+    for (let letter of text.toLowerCase()) {
+        if (vowels.includes(letter)) {
+            counter++
+        }
+    }
+
+    // Return number of vowels
+    return counter
+}
+
+// REGULAR EXPRESSIONS
+
+function vowelsCounter(text) {
+    // Search text with Regex and store all matching instances
+    let matchingInstances = text.match(/[aeiou]/gi);
+
+    // Check if matching instances exist then calculate length
+    if (matchingInstances) {
+        // Return number of vowels
+        return matchingInstances.length
+    } else {
+        return 0
+    }
+}

src/vowelsCounter/test.js

@@ -0,0 +1,21 @@
+const vowelsCounter = require('./index');
+
+test('vowelsCounter is a function', () => {
+  expect(typeof vowelsCounter).toEqual('function');
+});
+
+test('returns the number of vowels found', () => {
+  expect(vowelsCounter('aeiou')).toEqual(5);
+});
+
+test('returns the number of vowels found when string is capitalized', () => {
+  expect(vowelsCounter('AEIOU')).toEqual(5);
+});
+
+test('returns the number of vowels found when all alphabets are passed in', () => {
+  expect(vowelsCounter('abcdefghijklmnopqrstuvwxyz')).toEqual(5);
+});
+
+test('returns the number of vowels found when string has mixed capitalization', () => {
+  expect(vowelsCounter('Abcdegfizzjbhso')).toEqual(4);
+});