Double Vowels

// ['w','h','a','t',' ','o','n',' ','e','a','r','t','h',' ','a','r','e',' ','y','o','u',' ','t','a','l','k','i','n','g',' ','a','b','o','u','t','?']


function isVowel(x) {
  var result;
  result = x === "a" || x === "e" || x === "i" || x === "o" || x === "u";
  return result;
}

function doubleV(array) {
  var result = [];
  for (var i = 0; i < array.length; i++) {
    if (isVowel(array[i])) {
      result.push(array[i], array[i])
    } else {
      result.push(array[i]);
    }
  }
  return result;
}

doubleV(['w','h','a','t',' ','o','n'])