Find the Symmetric difference between two arrays - JavaScript

In Mathematics, the symmetric difference of two sets, say A and B is represented by A ? B

And it is defined as the set of all those elements which belongs either to A or to B but not to both.

For example −

const A = [1, 2, 3, 4, 5, 6, 7, 8]; const B = [1, 3, 5, 6, 7, 8, 9];

Then the symmetric difference of A and B will be −

const diff = [2, 4, 9]

Example

Following is the code −

const A = [1, 2, 3, 4, 5, 6, 7, 8]; const B = [1, 3, 5, 6, 7, 8, 9]; const symmetricDifference = (arr1, arr2) => {    const res = [];    for(let i = 0; i < arr1.length; i++){       if(arr2.indexOf(arr1[i]) !== -1){          continue;       };       res.push(arr1[i]);    }    for(let i = 0; i < arr2.length; i++){       if(arr1.indexOf(arr2[i]) !== -1){          continue;       };       res.push(arr2[i]);    };    return res; }; console.log(symmetricDifference(A, B));

Output

This will produce the following output in console −

[2, 4, 9]