function MyMap() {

        var items = {};

        this.has = function (key) {

            return key in items;

        };

        this.set = function (key, value) {

            items[key] = value;

        };

        this.remove = function (key) {

            if (this.has(key)) {

                delete items[key];

                return true;

            }

            return false;

        };

        this.get = function (key) {

            return this.has(key) ? items[key] : undefined;

        };

        this.values = function () {

            var values = new Array();

            for (var k in items) {

                if (this.has(k)) {

                    values.push(items[k]);

                }

            }

            return values;

        };

        this.getItems = function () {

            return items;

        };

        this.clear = function () {

            items = {};

        };

        this.getCount = function () {

            return Object.keys(items).length;

        };

    }