const words = ["red", "yellow", "green", "blue", "purple", "radish", "rainbow"];

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

  for (let i = 0; i < list.length; i++) {
    const word = list[i];
    let newWord = [];

    for (let j = 0; j < word.length; j++) {
      const letter = word[j];

      // the if statement he is essentially the same as what you did with your else if chain.
      // it's basically checking that it isn't any of the vowels.
      if (
        letter !== "a" &&
        letter !== "e" &&
        letter !== "i" &&
        letter !== "o" &&
        letter !== "u"
      ) {
        // Push the letter into the word array.
        // Assuming code.org has it's own syntax you could do appendItem(newWord, letter) from what i understood from your usage of it.
        newWord.push(letter);
      }
    }

    // Here we're pushing newWord.join(""),
    // this means we're taking the array of letters, and joining them together into a word, before pushing it into the filtered word list.
    // We could have had newWord be an empty string instead,
    // then concatenating each letter in the if statement earlier instead of pushing. (newWord += letter; instead of newWord.push(letter))
    filteredWordList.push(newWord.join(""));
  }

  return filteredWordList;
}

console.log(removeVowels(words));