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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]

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));

This will produce the following output in console −

[2, 4, 9]

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