DecoratorSample.js

var VanillaIcecream = (function () {
    function VanillaIcecream() {
    }
    VanillaIcecream.prototype.getName = function () {
        return "バニラアイスクリーム";
    };
    VanillaIcecream.prototype.howSweet = function () {
        return "バニラ味";
    };
    return VanillaIcecream;
})();
var GreenTeaIcecream = (function () {
    function GreenTeaIcecream() {
    }
    GreenTeaIcecream.prototype.getName = function () {
        return "抹茶アイスクリーム";
    };
    GreenTeaIcecream.prototype.howSweet = function () {
        return "抹茶味";
    };
    return GreenTeaIcecream;
})();
var CashewNutsToppingIcecream = (function () {
    function CashewNutsToppingIcecream(ice) {
        this.ice = ice;
    }
    CashewNutsToppingIcecream.prototype.getName = function () {
        var name = "カシューナッツ";
        name += this.ice.getName();
        return name;
    };
    CashewNutsToppingIcecream.prototype.howSweet = function () {
        return this.ice.howSweet();
    };
    return CashewNutsToppingIcecream;
})();
var ice1 = new CashewNutsToppingIcecream(new VanillaIcecream());
var ice2 = new CashewNutsToppingIcecream(new GreenTeaIcecream());

DecoratorSample.ts

//12. Decorator パターン | TECHSCORE(テックスコア)
//http://www.techscore.com/tech/DesignPattern/Decorator.html/

interface Icecream {
	getName() : string;
	howSweet() : string;
}


class VanillaIcecream implements Icecream {
	constructor() {}

	getName() : string {
		return "バニラアイスクリーム";
	}

	howSweet() : string {
		return "バニラ味";
	}
}


class GreenTeaIcecream implements Icecream {
	constructor() {}

	getName() : string {
		return "抹茶アイスクリーム";
	}

	howSweet() : string {
		return "抹茶味";
	}
}


class CashewNutsToppingIcecream implements Icecream {
	private ice : Icecream;

	constructor(ice: Icecream) {
		this.ice = ice;
	}

	getName() : string {
		var name : string = "カシューナッツ";
        	name += this.ice.getName();
        	return name;
	}

	howSweet() : string {
		return this.ice.howSweet();
	}
}


var ice1 : Icecream = new CashewNutsToppingIcecream(new VanillaIcecream());
var ice2 : Icecream = new CashewNutsToppingIcecream(new GreenTeaIcecream());
//var ice3 : Icecream = new SliceAlmondToppingIcecream(new CashewNutsToppingIcecream(new VanillaIcecream()));