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symmetricDifferenceWith javascript Code Snippet in 2023

arrayintermediate

Last Updated: 3 February 2023

Returns the symmetric difference between two arrays, using a provided function as a comparator.

  • Use Array.prototype.filter() and Array.prototype.findIndex() to find the appropriate values.
const symmetricDifferenceWith = (arr, val, comp) => [ ...arr.filter(a => val.findIndex(b => comp(a, b)) === -1), ...val.filter(a => arr.findIndex(b => comp(a, b)) === -1) ];
symmetricDifferenceWith( [1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b) ); // [1, 1.2, 3.9]

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