rc-js-util/bin/esm/array/impl/array-union.js

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

import { fpIdentity } from "../../fp/impl/fp-identity.js";
import { mapValuesToArray } from "../../map/impl/map-values-to-array.js";
/**
 * @public
 * Given an `ArrayLike` of `ArrayLike`, provides all unique items in an `Array`.
 *
 * @remarks
 * See {@link arrayUnion}.
 */
export function arrayUnion(items, getComparisonValue = fpIdentity) {
    const result = new Map();
    for (let i = 0, iEnd = items.length; i < iEnd; ++i) {
        const innerItems = items[i];
        for (let j = 0, jEnd = innerItems.length; j < jEnd; ++j) {
            const item = innerItems[j];
            result.set(getComparisonValue(item, j), item);
        }
    }
    return mapValuesToArray(result);
}
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