diginext-utils/esm/array/intersection.js

README.md

/**
 * Creates an array of values that are present in all given arrays.
 * Returns elements that exist in every array.
 *
 * @template T - The type of elements in the arrays
 * @param array1 - First array
 * @param array2 - Second array
 * @returns A new array containing only values present in both arrays
 *
 * @example
 * ```ts
 * intersection([1, 2, 3], [2, 3, 4]); // [2, 3]
 * intersection(['a', 'b'], ['b', 'c']); // ['b']
 * intersection([1, 2], [3, 4]); // []
 * ```
 */
export function intersection(array1, array2) {
    if (!Array.isArray(array1) || !Array.isArray(array2)) {
        return [];
    }
    const set2 = new Set(array2);
    return array1.filter((item) => set2.has(item));
}
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