Method isSubsetOf

src/lualib/Set.ts:220–227

* @returns a boolean indicating whether all the elements in this Set are also in the argument.

(other: ReadonlySet<unknown>)

     * @returns a boolean indicating whether all the elements in this Set are also in the argument.
     */
    public isSubsetOf(other: ReadonlySet<unknown>): boolean {
        for (const item of this) {
            if (!other.has(item)) {
                return false;
            }
        }
        return true;
    }

    /**
     * @returns a boolean indicating whether all the elements in the argument are also in this Set.