Javascript algorithm to find elements in array that are not in another array

Question

I\'m looking for a good algorithm to get all the elements in one array that are not elements in another array. So given these arrays:

var x = [\"a\",\"b\",\         


        

Answer 1

 findDiff = (A, B) => {
     return  A.filter(function (a) {
          return !B.includes(a);
     });
 }