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symmetricDifferenceBy javascript Code Snippet in 2024

arrayintermediate

Last Updated: 10 February 2024

Returns the symmetric difference between two arrays, after applying the provided function to each array element of both.

  • Create a new Set() from each array to get the unique values of each one after applying fn to them.
  • Use Array.prototype.filter() on each of them to only keep values not contained in the other.
const symmetricDifferenceBy = (a, b, fn) => { const sA = new Set(a.map(v => fn(v))), sB = new Set(b.map(v => fn(v))); return [...a.filter(x => !sB.has(fn(x))), ...b.filter(x => !sA.has(fn(x)))]; };
symmetricDifferenceBy([2.1, 1.2], [2.3, 3.4], Math.floor); // [ 1.2, 3.4 ] symmetricDifferenceBy( [{ id: 1 }, { id: 2 }, { id: 3 }], [{ id: 1 }, { id: 2 }, { id: 4 }], i => i.id ); // [{ id: 3 }, { id: 4 }]

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