text: const vowels = str => {
    let count = 0;
    let checker = ['a', 'e', 'i', 'o', 'u'];
  
    for (let char of str.toLowerCase()) {
      if (checker.includes(char)) {
        count++;
      }
    }
    return count;
  };
  
  console.log(vowels('oaiou'));
  