32 lines
1.4 KiB
JavaScript
32 lines
1.4 KiB
JavaScript
import { intersectionBy as intersectionBy$1 } from "../../array/intersectionBy.mjs";
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import { combineEagerAndLazyFunctions, createLazyFunction } from "../_internal/lazy.mjs";
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//#region src/fp/array/intersectionBy.ts
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/**
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* Creates a function that keeps values whose mapped identity appears in another array.
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*
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* The mapper is applied to values from both arrays. The returned function is
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* lazy-capable inside {@link pipe}.
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*
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* @template T - The type of elements in the piped array.
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* @template U - The type of elements in the configured array.
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* @param secondArray - Values to intersect with the piped array after mapping.
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* @param mapper - Maps values from both arrays to comparison keys.
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* @returns A function that maps the piped array to its mapped intersection.
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*
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* @example
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* import { intersectionBy, pipe } from 'es-toolkit/fp';
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*
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* pipe([{ id: 1 }, { id: 2 }], intersectionBy([2], value => typeof value === 'number' ? value : value.id));
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* // => [{ id: 2 }]
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*/
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function intersectionBy(secondArray, mapper) {
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const mappedSecondSet = new Set(secondArray.map((item) => mapper(item)));
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function intersectionByEager(array) {
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return intersectionBy$1(array, secondArray, mapper);
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}
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return combineEagerAndLazyFunctions(intersectionByEager, createLazyFunction((value, _index, emit) => {
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if (mappedSecondSet.has(mapper(value))) emit(value);
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}));
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}
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//#endregion
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export { intersectionBy };
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