export function intersection(arr1: unknown[], arr2: unknown[]) {
    const set = new Set(arr2);
    const intersection = new Set(arr1.filter((elem) => set.has(elem)));
    return Array.from(intersection);
}

export function difference(arr1: unknown[], arr2: unknown[]) {
    const set = new Set(arr2);
    const intersection = new Set(arr1.filter((elem) => !set.has(elem)));
    return Array.from(intersection);
}

export function symmetricDifference(arr1: unknown[], arr2: unknown[]) {
    return difference(arr1, arr2).concat(difference(arr2, arr1));
}

/**
 * Removes the element at the specified index from the array, and returns a new array.
 *
 * @export
 * @template T
 * @param {T[]} arr
 * @param {number} index
 * @returns {T[]}
 */
export function remove<T>(arr: T[], index: number): T[] {
    // Remove the element at the given index, return a new array
    return [...arr.slice(0, index), ...arr.slice(index + 1)];
}