/* Write a function that takes two or more arrays and returns a new array of unique values in the order of the original provided arrays.
In other words, all values present from all arrays should be included in their original order, but with no duplicates in the final array.
The unique numbers should be sorted by their original order, but the final array should not be sorted in numerical order.
*/

function uniteUnique(arr) {
  let temp = [...arguments];  //Create array of passed arguments
  let newArr = []     //New array to hold unique numbers
  for (let obj in temp) {
    for (let item in temp[obj]) //Nested loop to check each (nested) array item
    {
      if (! newArr.includes(temp[obj][item])) { //check if number is not in newArr
        newArr.push(temp[obj][item])     //Push unique items
      }
    }
  }
  return newArr;
}

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