Method intersection

src/lualib/Set.ts:181–189

* @returns a new Set containing all the elements which are both in this Set and in the argument.

(other: ReadonlySet<T>)

     * @returns a new Set containing all the elements which are both in this Set and in the argument.
     */
    public intersection(other: ReadonlySet<T>) {
        const result = new Set<T>();
        for (const item of this) {
            if (other.has(item)) {
                result.add(item);
            }
        }
        return result;
    }

    /**
     * @returns a new Set containing all the elements in this Set which are not also in the argument.