For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt, and this page is available as Markdown at /reference/array/xorWith.md.
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    xorWith es-toolkit

    Creates a new array with elements that exist in only one of two arrays using a given comparison function.

    const result = xorWith(arr1, arr2, areElementsEqual);

    Usage

    xorWith(arr1, arr2, areElementsEqual)

    Use xorWith when you want to find the symmetric difference with complex objects or special comparison conditions. It creates a new array with elements that exist in only one of the two arrays by comparing elements with a user-defined equality function.

    import { xorWith } from 'es-toolkit/array';

// Compare by object id.
xorWith(
  [
    { id: 1, name: 'Alice' },
    { id: 2, name: 'Bob' },
  ],
  [
    { id: 2, name: 'Bobby' },
    { id: 3, name: 'Charlie' },
  ],
  (a, b) => a.id === b.id
);
// Returns: [{ id: 1, name: 'Alice' }, { id: 3, name: 'Charlie' }]

// Compare case-insensitively.
xorWith(['Apple', 'Banana'], ['APPLE', 'Cherry'], (a, b) => a.toLowerCase() === b.toLowerCase());
// Returns: ['Banana', 'Cherry']

    More complex comparisons are also possible.

    import { xorWith } from 'es-toolkit/array';

// Compare by absolute value.
xorWith([-1, -2, 3], [1, 2, -4], (a, b) => Math.abs(a) === Math.abs(b));
// Returns: [3, -4]

// Deep object comparison.
xorWith(
  [{ specs: { ram: 8, storage: 256 } }],
  [{ specs: { ram: 8, storage: 256 } }],
  (a, b) => a.specs.ram === b.specs.ram && a.specs.storage === b.specs.storage
);
// Returns: []

    Parameters

    arr1readonly T[]required

    The first array to compare.

    arr2readonly T[]required

    The second array to compare.

    areElementsEqual(item1: T, item2: T) => booleanrequired

    A function that determines if two elements are equal. It should return true if they are the same, and false otherwise.

    Returns

    Returns a new array representing the symmetric difference calculated based on the custom equality function.

    T[]
    Source: es-toolkit

    Re-exported verbatim from es-toolkit. Implementation, edge cases, and performance behavior are owned upstream. This page mirrors the documentation at the pinned version; the linked source is authoritative.