set
Set<V>
using a Map<V, Bool>
implementation.
interface ISet<V> {
var length(default, null): Int;
function add(value: V): Void;
function remove(value: V): Bool;
function exists(value: V): Bool;
function iterator(): Iterator<V>;
function copy(): ISet<V>;
function toString(): String;
function clear(): Void;
}