Counting number of vowels in a string with JavaScript

Question

I\'m using basic JavaScript to count the number of vowels in a string. The below code works but I would like to have it cleaned up a bit. Would using .includes()

Answer 1

Function vowels(str){
   let count=0;
   const checker=['a','e','i','o','u'];
   for (let char of str.toLowerCase){
      if (checker.includes(char)){
        count++;
      }
   return count;
}


Function vowels(str){
   const match = str.match(/[aeiou]/gi);
   return match ? match.length : 0 ;
}