var book = {};
    Object.defineProperties(book,{
            _year: {
                value: 1
            },edition: {
                value: 23
            },year: {
                get: function () {
                    return this._year;
                },set: function (newValue) {
                    if (newValue > 2004)
                        this._year = newValue;
                }
            }
        }
    );
    book.year = 2015;
    alert(book.year);