const words = ["red", "yellow", "green", "blue", "purple", "radish", "rainbow"];
const vowels = ["a", "e", "i", "o", "u"];

function removeVowels(list) {
  const filteredWordList = [];

  // loop through each entry of the list, assigning it to "word".
  list.forEach((word) => {
    let newWord = [];

    // split word into an array of letters, and loop over each letter.
    word.split("").forEach((letter) => {
      // check if the array of vowels we made, doesn't include the letter.
      // We use .toLowerCase() to ensure case-insensitivity
      // i.e. ensure that "A" would match against the "a" in the vowel array.
      if (!vowels.includes(letter.toLowerCase())) {
        newWord.push(letter);
      }
    });

    filteredWordList.push(newWord.join(""));
  });

  return filteredWordList;
}

console.log(removeVowels(words));