39 lines
1.8 KiB
JavaScript
39 lines
1.8 KiB
JavaScript
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import { windowed } from "../../array/windowed.mjs";
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import { identity } from "../../function/identity.mjs";
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import { iteratee } from "../util/iteratee.mjs";
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import { isArrayLikeObject } from "../predicate/isArrayLikeObject.mjs";
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import { last } from "./last.mjs";
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import { differenceBy } from "./differenceBy.mjs";
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import { intersectionBy } from "./intersectionBy.mjs";
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import { unionBy } from "./unionBy.mjs";
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//#region src/compat/array/xorBy.ts
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/**
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* Computes the symmetric difference between two arrays using a custom mapping function.
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* The symmetric difference is the set of elements which are in either of the arrays,
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* but not in their intersection, determined by the result of the mapping function.
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*
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* @template T - Type of elements in the input arrays.
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* @template U - Type of the values returned by the mapping function.
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*
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* @param {...(ArrayLike<T> | null | undefined | PropertyKey | Partial<T> | ((value: T) => unknown))} values - The arrays to inspect, or the function to map array elements to comparison values.
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* @returns {T[]} An array containing the elements that are present in either `arr1` or `arr2` but not in both, based on the values returned by the mapping function.
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*
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* @example
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* // Custom mapping function for objects with an 'id' property
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* const idMapper = obj => obj.id;
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* xorBy([{ id: 1 }, { id: 2 }], [{ id: 2 }, { id: 3 }], idMapper);
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* // Returns [{ id: 1 }, { id: 3 }]
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*/
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function xorBy(...values) {
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const lastValue = last(values);
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let mapper = identity;
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if (!isArrayLikeObject(lastValue) && lastValue != null) {
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mapper = iteratee(lastValue);
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values = values.slice(0, -1);
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}
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const arrays = values.filter(isArrayLikeObject);
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return differenceBy(unionBy(...arrays, mapper), unionBy(...windowed(arrays, 2).map(([arr1, arr2]) => intersectionBy(arr1, arr2, mapper)), mapper), mapper);
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}
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//#endregion
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export { xorBy };
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