how to find unqiue reords in two array code example

Example 1: find unique values between multiple array

var array3 = array1.filter(function(obj) { return array2.indexOf(obj) == -1; });

Example 2: return uncommon from two arrays js

let array = [1,2,3,4,5,6,78,9];

function except(array,excluded){
let newArr,temp,temp1;

      check1=array.filter(function(value) 
                {
                  return excluded.indexOf(value) == -1; 

                });

      check2=excluded.filter(function(value) 
                {
                  return array.indexOf(value) == -1; 

                });

    output=check1.concat(check2);


    return output;

  }


except(array,[1,2])

//so the output would be => [ 3, 4, 5, 6, 78, 9 ]

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