es-next-tools/dist/array/intersection.js

A comprehensive utility library for JavaScript and TypeScript that provides a wide range of functions for common programming tasks, including mathematical operations, date manipulations, array and object handling, string utilities, and more.

/**
 * Returns an array of elements that are present in both input arrays.
 * @param {T[]} array1 - The first array.
 * @param {T[]} array2 - The second array.
 * @returns {T[]} An array containing elements present in both input arrays.
 * @template T
 * @deprecated - Use Set.intersection() instead.
 * @example
 * const arr1 = [1, 2, 3, 4, 5];
 * const arr2 = [3, 4, 5, 6, 7];
 * const result = intersection(arr1, arr2); // [3, 4, 5]
 */
export function intersection(array1, array2) {
    const result = [];
    const setB = new Set(array2);
    for (let i = 0; i < array1.length; i++) {
        let z = array1[i];
        if (setB.has(z))
            result.push(z);
    }
    ;
    return result;
}