count vowels in the string

countVowels.js

const str = "Hey JS! You R AMAZING";
const vowels = ["a", "e", "i", "o", "u"];
function countVowels(data){
    let count = 0;
    data.toLowerCase().split("").forEach((ch) => { vowels.includes(ch) && count++;})
    return count; 
}

const numberOfVowels = countVowels(str);
console.log(numberOfVowels);