demo structure

.gitignore

@@ -0,0 +1 @@
+node_modules

Beginner/vowelsCounter/index.js

@@ -0,0 +1,25 @@
+/*
+An iterative approach to counting the number of vowels in a
+string of text.
+*/
+
+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
+    }
+
+
+module.exports = vowelsCounter;

Beginner/vowelsCounter/test.js

@@ -0,0 +1,13 @@
+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);
+});