Interface Set<E>

interface Set<E> {
    add(e: E): boolean;
    addAll(c: Collection<E>): boolean;
    clear(): void;
    contains(o: any): boolean;
    containsAll(c: Collection<any>): boolean;
    forEach(action: Consumer<E>): void;
    hashCode(): number;
    isEmpty(): boolean;
    iterator(): Iterator<E>;
    remove(o: any): boolean;
    removeAll(c: Collection<any>): boolean;
    removeIf(filter: Predicate<E>): boolean;
    retainAll(c: Collection<any>): boolean;
    size(): number;
    toArray(): any[];
    toArray<T>(a: T[]): T[];
}