TypeScriptでのFactoryMethod

普通だ。

factory_method.ts

interface SlimeStatus {
  name: string;
  hitPoint: number;
  magicPoint: number;
  experiencePoint: number;
  gold: number;
}

var SlimeType = {
  normal: {
    name: "Slime",
    hitPoint: 6,
    magicPoint: 2,
    experiencePoint: 1,
    gold: 1
  },
  she: {
    name: "SheSlime",
    hitPoint: 10,
    magicPoint: 3,
    experiencePoint: 2,
    gold: 1
  },
  metal: {
    name: "MetalSlime",
    hitPoint: 4,
    magicPoint: 999,
    experiencePoint: 2010,
    gold: 14
  },
  liquidMetal: {
    name: "LiquidMetalSlime",
    hitPoint: 8,
    magicPoint: 999,
    experiencePoint: 20100,
    gold: 21
  } 
};

class Slime {
  name: string;
  hitPoint: number;
  magicPoint: number;
  experiencePoint: number;
  gold: number;

  constructor(status: SlimeStatus) {
    this.name = status.name;
    this.hitPoint = status.hitPoint;
    this.magicPoint = status.magicPoint;
    this.experiencePoint = status.experiencePoint;
    this.gold = status.gold; 
  }

  public static makeNormal(): Slime {
    return new Slime(SlimeType.normal);
  }

  public static makeShe(): Slime {
    return new Slime(SlimeType.she);
  }

  public static makeMetal(): Slime {
    return new Slime(SlimeType.metal);
  }

  public static makeLiquidMetal(): Slime {
    return new Slime(SlimeType.liquidMetal);
  }
}

module Runner {
  function viewStatus(slime: Slime): void {
    console.log("Name is: " + slime.name);
    console.log("Hit Point is: " + slime.hitPoint);
    console.log("Magic Point is: " + slime.magicPoint);
    console.log("Experience Point is: " + slime.experiencePoint);
    console.log("Gold is: " + slime.gold);
  }

  export function blame() {
    var slimes: Slime[] = [
      Slime.makeNormal(),
      Slime.makeShe(),
      Slime.makeMetal(),
      Slime.makeLiquidMetal()
    ];

    for(var i = 0; i < slimes.length; i++) { 
      console.log("---------------");
      viewStatus(slimes[i]);
    }
  }
}

Runner.blame();

結果

---------------
Name is: Slime
Hit Point is: 6
Magic Point is: 2
Experience Point is: 1
Gold is: 1
---------------
Name is: SheSlime
Hit Point is: 10
Magic Point is: 3
Experience Point is: 2
Gold is: 1
---------------
Name is: MetalSlime
Hit Point is: 4
Magic Point is: 999
Experience Point is: 2010
Gold is: 14
---------------
Name is: LiquidMetalSlime
Hit Point is: 8
Magic Point is: 999
Experience Point is: 20100
Gold is: 21

やはり、

interfaceでアクセス権(public, private)やstaticなどの定義できるといいんだけどな...
抽象クラス書くのめんどうくさいけど本来のTypeScriptを使う目的としては要らない場面なのかも。
(今回はFactoryMethodをもたせているClassはBaseからの継承などしていない)