Array unique symmetric difference

OSCC · JavaScript, Array, Math · Oct 22, 2020

Returns the unique symmetric difference between two arrays, not containing duplicate values from either array.

const uniqueSymmetricDifference = (a, b) => [
  ...new Set([
    ...a.filter(v => !b.includes(v)),
    ...b.filter(v => !a.includes(v)),
  ]),
];
uniqueSymmetricDifference([1, 2, 3], [1, 2, 4]); // [3, 4]
uniqueSymmetricDifference([1, 2, 2], [1, 3, 1]); // [2, 3]

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