To add to the multiple solutions posted, this was my method:

function vowelsAndConsonants(s) {

const vowelArray = ["a", "e", "i", "o", "u"];
let outputVowel = ""; 
let outputConsonant = ""; 

for (let i = 0, len = s.length; i < len; i++) {

    if (vowelArray.includes(s[i])) {
        outputVowel += s[i] + '\n';
    } else {
        outputConsonant += s[i] + '\n';

    }

}

console.log(outputVowel + outputConsonant)

}