Discussion on: Daily Challenge #3 - Vowel Counter

[Jarod Smith]

function countVowels(string) {
  if(typeof(string) !== 'string')
    throw new Error('input must be a string');

  const vowels = 'aeiouAEIOU';
  let vowelCount = 0;

  for(index in string) {
    if(vowels.includes(string.charAt(index)))
      vowelCount++;
  }
  return vowelCount;
}

ledgible I hope