observer.js

var NotifySystem = /** @class */ (function () {
    function NotifySystem() {
        this.observList = new Array();
    }
    NotifySystem.prototype.registerObserver = function (o) {
        this.observList.push(o);
    };
    NotifySystem.prototype.removeObserver = function (o) {
        this.observList = this.observList.filter(function (x) { return x !== o; });
    };
    NotifySystem.prototype.notifyObserver = function () {
        if (this.observList) {
            this.observList.forEach(function (x) {
                x.update();
            });
        }
    };
    return NotifySystem;
}());
var ObserveUser1 = /** @class */ (function () {
    function ObserveUser1() {
    }
    ObserveUser1.prototype.update = function () {
        console.log("1 아이템을 획득했습니다.");
    };
    return ObserveUser1;
}());
var ObserveUser2 = /** @class */ (function () {
    function ObserveUser2() {
    }
    ObserveUser2.prototype.update = function () {
        console.log("2 아이템을 획득했습니다.");
    };
    return ObserveUser2;
}());
var notifySystem = new NotifySystem();
var user1 = new ObserveUser1();
var user2 = new ObserveUser2();
console.log('------------------------------------');
notifySystem.registerObserver(user1);
notifySystem.registerObserver(user2);
notifySystem.notifyObserver();
console.log('------------------------------------');
notifySystem.removeObserver(user1);
notifySystem.removeObserver(user2);
notifySystem.notifyObserver();
console.log('------------------------------------');
notifySystem.registerObserver(user1);
notifySystem.removeObserver(user2);
notifySystem.notifyObserver();

ts