kirilloid · March 18, 2016 16:52 · Mar 18, 2016
diff --git a/factory.js b/factory.js
@@ -0,0 +1,39 @@
+class Shape {
+    constructor (type, ...args) {
+        super();
+        switch (type) {
+        case 'rect':
+            return new Rectangle(...args);
+        case 'circle':
+            return new Circle(...args);
+        }
+    }
+}
+
+class Circle extends Shape {
+    constructor (radius) {
+        this.radius = radius;
+    }
+    surface () {
+        return Math.PI * this.radius ** 2;
+    }
+}
+
+class Rect extends Shape {
+    constructor (width, height) {
+        this.width = width;
+        this.height = height;
+    }
+    surface () {
+        return this.width * this.height;
+    }
+}
+// factory method (Static Factory)
+Shape.create('circle', [4]);
+
+// abstract factory
+new Shape.CircleFactory().create(4);
+new Shape.RectFactory().create(5, 3);
+
+new Shape('circle', 4);
+new Shape('rect', 5, 3);