Compare two arrays & save the mismatched data in an array

[aksh-s-rathod (Rudra)]

I need to compare two arrays & get the mismatched data from both into third array.

Details: following is the code I used for reference

var array1 = [1, 2, 3, 4, 8, 5, 6, 7];
var array2 = [6, 5, 4, 3, 2, 1] ;
var array3 = [];


for(var j=0; j<array1.length; j++)
{
    var ar1 = array1[j];
    //console.log("*****"+ar1+"*****")

    for(var k=0; k<array2.length; k++)
    {
        var ar2 = array2[k];
    //console.log("####"+ar2+"####")

        if(ar1===ar2)
        {
            console.log(ar1+" is equal to "+ar2)
            break;
        }
        // else
        // if(k=array2.length)
        // {
        //     console.log("the value "+ar1+" is not found")
        // }
       
    }
}

Please let me know if we can get mismatched data using this, else if you have any another way to compare & get mismatched data please provide the solution, Thanks !!!

[michaelderekjones (Mike Jones)]

The problem is that you are comparing one array to another. Therefore, you need to know which array has the most entries for the comparison. There are a lot of assumptions going on here, but something like the following…

var array1 = [1, 2, 3, 4, 8, 5, 6, 7];
console.log(array1);
var array2 = [6, 5, 4, 3, 2, 1];
console.log(array2);

if (array2.length >= array1.length) {
    var difference = array2.filter(n=>!array1.includes(n))
} else {
    var difference = array1.filter(n=>!array2.includes(n))
}

console.log(difference);