numberOfVowels.js

let numberOfVowels = function(data) {
  let count = 0;
  for (var i = 0; i < data.length; i++) {
    if(data[i] === 'a' || data[i] === 'e' || data[i] === 'i' || data[i] === 'o' || data[i] === 'u') {
      count++;
    }
  }
  return count;
};

console.log(numberOfVowels("orange"));
console.log(numberOfVowels("lighthouse labs"));
console.log(numberOfVowels("aeiou"));