53 lines
2.8 KiB
JavaScript
53 lines
2.8 KiB
JavaScript
const require_intersectionBy = require("../../array/intersectionBy.js");
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const require_last = require("../../array/last.js");
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const require_uniq = require("../../array/uniq.js");
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const require_identity = require("../../function/identity.js");
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const require_property = require("../object/property.js");
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const require_isArrayLikeObject = require("../predicate/isArrayLikeObject.js");
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//#region src/compat/array/intersectionBy.ts
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/**
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* Returns the intersection of multiple arrays after applying the iteratee function to their elements.
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*
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* This function takes multiple arrays and an optional iteratee function (or property key)
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* to compare the elements after transforming them. It returns a new array containing the elements from
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* the first array that are present in all subsequent arrays after applying the iteratee to each element.
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* If no iteratee is provided, the identity function is used.
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*
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* If the first array is `null` or `undefined`, an empty array is returned.
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*
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* @template T
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* @param {ArrayLike<T> | null | undefined} array - The first array to compare.
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* @param {...(ArrayLike<T> | ((value: T) => unknown) | string)} values - The arrays to compare, or the iteratee function.
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* @returns {T[]} A new array containing the elements from the first array that are present
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* in all subsequent arrays after applying the iteratee.
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*
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* @example
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* const array1 = [{ x: 1 }, { x: 2 }, { x: 3 }];
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* const array2 = [{ x: 2 }, { x: 3 }];
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* const result = intersectionBy(array1, array2, 'x');
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* // result will be [{ x: 2 }, { x: 3 }] since these elements have the same `x` property.
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*
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* @example
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* const array1 = [1.1, 2.2, 3.3];
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* const array2 = [2.3, 3.3];
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* const result = intersectionBy(array1, array2, Math.floor);
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* // result will be [2.3, 3.3] since it shares the same integer part when `Math.floor` is applied.
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*/
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function intersectionBy(array, ...values) {
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if (!require_isArrayLikeObject.isArrayLikeObject(array)) return [];
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const lastValue = require_last.last(values);
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if (lastValue === void 0) return Array.from(array);
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let result = require_uniq.uniq(Array.from(array));
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const count = require_isArrayLikeObject.isArrayLikeObject(lastValue) ? values.length : values.length - 1;
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for (let i = 0; i < count; ++i) {
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const value = values[i];
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if (!require_isArrayLikeObject.isArrayLikeObject(value)) return [];
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if (require_isArrayLikeObject.isArrayLikeObject(lastValue)) result = require_intersectionBy.intersectionBy(result, Array.from(value), require_identity.identity);
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else if (typeof lastValue === "function") result = require_intersectionBy.intersectionBy(result, Array.from(value), (value) => lastValue(value));
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else if (typeof lastValue === "string") result = require_intersectionBy.intersectionBy(result, Array.from(value), require_property.property(lastValue));
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}
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return result;
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}
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//#endregion
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exports.intersectionBy = intersectionBy;
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