add vowels solutions

Author: Connor Leech

udemy-interview-bootcamp-course/vowels.js

@@ -0,0 +1,51 @@
+// --- Directions
+// Write a function that returns the number of vowels
+// used in a string.  Vowels are the characters 'a', 'e'
+// 'i', 'o', and 'u'.
+// --- Examples
+//   vowels('Hi There!') --> 3
+//   vowels('Why do you ask?') --> 4
+//   vowels('Why?') --> 0
+
+function vowels(str) {
+	let count = 0;
+
+	str.split('').map((letter)=>{
+		letter = letter.toLowerCase() || null;
+		if(letter == 'a' || letter == 'e' || letter == 'i' || letter == 'o' || letter == 'u'){
+			count++;
+		}
+	});
+
+	return count;
+}
+
+
+
+
+// Could uss a for ... of loop 
+function vowels(str) {
+  let count = 0;
+  const checker = ['a', 'e', 'i', 'o', 'u'];
+
+  for (let char of str.toLowerCase()) {
+    if (checker.includes(char)) {
+      count++;
+    }
+  }
+
+  return count;
+}
+
+
+
+
+// or a regular expression:
+function vowels(str) {
+  const matches = str.match(/[aeiou]/gi);
+  return matches ? matches.length : 0;
+}
+
+
+
+console.log(vowels('Why do you ask?'));