Mimics Java Set in JavaScript (DRAFT, NOT TESTED)

set.js

	function Set() {
		this.data = {};
		this.add.apply(this, arguments);
	}

	Set.prototype = {
		add: function (key) {
			this.data[key] = true;
		},

		remove: function (key) {
			delete this.data[key];
		},

		clear: function () {
			this.data = {};
			return this;
		},

		contains: function (key) {
			return this.data.hasOwnProperty(key);
		},

		isEmpty: function () {
			for (var key in this.data) {
				if (this.has(key)) {
					return false;
				}
			}
			return true;
		},

		size: function () {

		},

		keys: function () {
			var results = [];
			$.each(this.data, function (idx, key) {
				results.push(key);
			});
			return results;
		}
	};