Add builder pattern example for solution

Author: leemhoon00

src/Builder/Book/index.ts

@@ -0,0 +1,138 @@
+class House {
+  private walls: number;
+  private doors: number;
+  private windows: number;
+  private roof: string;
+  private swimmingPool: boolean;
+
+  setWalls(walls: number) {
+    this.walls = walls;
+  }
+
+  setDoors(doors: number) {
+    this.doors = doors;
+  }
+
+  setWindows(windows: number) {
+    this.windows = windows;
+  }
+
+  setRoof(roof: string) {
+    this.roof = roof;
+  }
+
+  setSwimmingPool(swimmingPool: boolean) {
+    this.swimmingPool = swimmingPool;
+  }
+
+  describeHouse() {
+    console.log("House description:");
+    console.log("Walls: ", this.walls);
+    console.log("Doors: ", this.doors);
+    console.log("Windows: ", this.windows);
+    console.log("Roof: ", this.roof);
+    console.log("Swimming pool: ", this.swimmingPool);
+  }
+}
+
+interface HouseBuilder {
+  buildWalls(): void;
+  buildDoors(): void;
+  buildWindows(): void;
+  buildRoof(): void;
+  buildSwimmingPool(): void;
+  getResult(): House;
+}
+
+class SmallHouseBuilder implements HouseBuilder {
+  private house: House;
+
+  constructor() {
+    this.house = new House();
+  }
+
+  buildWalls() {
+    this.house.setWalls(4);
+  }
+
+  buildDoors() {
+    this.house.setDoors(1);
+  }
+
+  buildWindows() {
+    this.house.setWindows(1);
+  }
+
+  buildRoof() {
+    this.house.setRoof("wooden roof");
+  }
+
+  buildSwimmingPool() {
+    this.house.setSwimmingPool(false);
+  }
+
+  getResult() {
+    return this.house;
+  }
+}
+
+class LargeHouseBuilder implements HouseBuilder {
+  private house: House;
+
+  constructor() {
+    this.house = new House();
+  }
+
+  buildWalls() {
+    this.house.setWalls(12);
+  }
+
+  buildDoors() {
+    this.house.setDoors(5);
+  }
+
+  buildWindows() {
+    this.house.setWindows(4);
+  }
+
+  buildRoof() {
+    this.house.setRoof("concrete roof");
+  }
+
+  buildSwimmingPool() {
+    this.house.setSwimmingPool(true);
+  }
+
+  getResult() {
+    return this.house;
+  }
+}
+
+class HouseDirector {
+  private builder: HouseBuilder;
+
+  constructor(builder: HouseBuilder) {
+    this.builder = builder;
+  }
+
+  constructHouse() {
+    this.builder.buildWalls();
+    this.builder.buildDoors();
+    this.builder.buildWindows();
+    this.builder.buildRoof();
+    this.builder.buildSwimmingPool();
+  }
+}
+
+const smallBuilder = new SmallHouseBuilder();
+const largeBuilder = new LargeHouseBuilder();
+
+const director1 = new HouseDirector(smallBuilder);
+director1.constructHouse();
+const smallHouse = smallBuilder.getResult();
+smallHouse.describeHouse();
+
+const director2 = new HouseDirector(largeBuilder);
+director2.constructHouse();
+const largeHouse = largeBuilder.getResult();
+largeHouse.describeHouse();