countVowels.js

// Create a function that takes a string and returns the number (count) of vowels contained within it.
// Examples:
// countVowels("Celebration") ➞ 5
// countVowels("Palm") ➞ 1
// countVowels("Prediction") ➞ 4
// Notes:
// a, e, i, o, u are considered vowels (not y).
// All test cases are one word and only contain letters.

// function countVowels(str) {
//   return str.match(/[aeiou]/g).length;
// }
// console.log(countVowels("Celebration"));
// console.log(countVowels("Palm"));

// Method 2
// const countVowels = (str) => {
//   return str.split("").filter((x) => "aeiouAEIOU".includes(x).length);
// };
// console.log(countVowels("aabc"));

function countVowels(str) {
  return str.split("").filter((x) => "aeiouAEIOU".includes(x)).length;
}
console.log(countVowels("aabc"));