42 lines
1.5 KiB
JavaScript
42 lines
1.5 KiB
JavaScript
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import { last } from "../../array/last.mjs";
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import { uniq } from "../../array/uniq.mjs";
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import { uniqWith } from "../../array/uniqWith.mjs";
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import { isArrayLikeObject } from "../predicate/isArrayLikeObject.mjs";
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import { flattenArrayLike } from "../_internal/flattenArrayLike.mjs";
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//#region src/compat/array/unionWith.ts
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/**
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* This function takes multiple arrays and returns a new array containing only the unique values
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* from all input arrays, preserving the order of their first occurrence.
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* A comparator function can be provided for comparison and it output values from the first possible array
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*
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* @template T - The type of elements in the arrays.
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* @param {...(ArrayLike<T> | null | undefined | Comparator<T, U>)} values - The arrays to inspect, or the comparator function.
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* @returns {T[]} Returns the new array of combined unique values.
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*
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* @example
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* const objects = [
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* { x: 1, y: 2 },
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* { x: 2, y: 1 },
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* ];
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* const others = [
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* { x: 1, y: 1 },
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* { x: 1, y: 2 },
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* ];
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* // Returns [objects[0], objects[1], others[0]]
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* unionWith(objects, others, isEqual);
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*
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* @example
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* const objects = [{ x: 1, y: 1 }];
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* const others = [{ x: 1, y: 2 }];
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* // Returns [{ x: 1, y: 1 }]
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* unionWith(objects, others, (a, b) => a.x === b.x);
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*/
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function unionWith(...values) {
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const lastValue = last(values);
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const flattened = flattenArrayLike(values);
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if (isArrayLikeObject(lastValue) || lastValue == null) return uniq(flattened);
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return uniqWith(flattened, lastValue);
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}
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//#endregion
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export { unionWith };
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