Intermediate Algorithm Scripting: Sorted Union

function uniteUnique(arr) {
  
  let myArr = [];

  for(let i=0; i<arguments.length; i++){
    for(let j=0; j< arguments[i].length; j++){
      myArr.push(arguments[i][j]);
    }
  }

  myArr = [...new Set(myArr)]
  
  return console.log(JSON.stringify(myArr));

}

uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]);
uniteUnique([1, 3, 2], [1, [5]], [2, [4]])
uniteUnique([1, 2, 3], [5, 2, 1])
uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8])