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

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

import { arrayIndex } from "./array-index.js";
import { fpIdentity } from "../../fp/impl/fp-identity.js";
/**
 * @public
 * Given two `ArrayLike`, provides the items common between them in an `Array`.
 *
 * @remarks
 * See {@link arrayIntersect}.
 */
export function arrayIntersect(a, b, getComparisonValue = fpIdentity) {
    const result = [];
    const bIndex = arrayIndex(b, getComparisonValue);
    for (let i = 0, iEnd = a.length; i < iEnd; ++i) {
        const item = a[i];
        if (bIndex.has(getComparisonValue(item, i))) {
            result.push(item);
        }
    }
    return result;
}
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