仅在保持正确序列的同时，将数组转换为唯一值

I have the following code:

我有以下代码:

function uniteUnique(arr) {
  //Create a single Array of value  
  arr = arguments[0].concat(arguments[1], arguments[2]);
  //Reduce the Array to unique values only
  arr = arr.reduce((pre, curr) => {
    //Some function to reduce values
  });
  return arr;
}

uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]);
function