Trying to solve symmetric difference using Javascript

Question

I am trying to figure out a solution for symmetric difference using javascript that accomplishes the following objectives:

• accepts an unspecified number of ar

Answer 1

// Set difference, a.k.a. relative compliment
const diff = (a, b) => a.filter(v => !b.includes(v))

const symDiff = (first, ...rest) => 
  rest.reduce(
    (acc, x) => [
      ...diff(acc, x), 
      ...diff(x, acc),
    ], 
    first,
  )    

/* - - - */
console.log(symDiff([1, 3], ['Saluton', 3]))    // [1, 'Saluton']
console.log(symDiff([1, 3], [2, 3], [2, 8, 5])) // [1, 8, 5]