Finding the symmetric difference

Tell us what’s happening:
Describe your issue in detail here
hello i would like to me help in find the symmetric difference

  **Your code so far**
function sym(args) {
return args;
}

sym([1, 2, 3], [5, 2, 1, 4]);
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Challenge: Find the Symmetric Difference

Link to the challenge:

What have you tried so far?

I have no idea of where to start with or start from

Well, what’s the symmetric difference of two arrays? If you have two sets of numbers , like

1,2,3,4

and

3,4,5,6

what’s the symmetric difference?