DoubleVowels

gistfile1.txt

//input = array of individual chars.
//ouput = same array with double the amount of vowels.

const doubleVowels = array => {
  for (let index = array.length - 1; index >= 0; index--) {
    if (checkForWowels(array[index])) {
      array.splice(index, 0, array[index]);
      index--;
    }
  }
  return array;
};

const checkForWowels = str => {
  str = str.toLowerCase();
  if (str === "a" || str === "e" || str === "i" || str === "o" || str === "u") {
    return true;
  }
  return false;
};