@@ -0,0 +1,19 @@
+'use strict';
+
+const point = (x, y) => {
+  const move = (dx, dy) => {
+    x += dx;
+    y += dy;
+  };
+  const clone = () => point(x, y);
+  const toString = () => `(${x}, ${y})`;
+  return { move, clone, toString };
+};
+
+// Usage
+
+const p1 = point(10, 20);
+console.log(p1.toString());
+const c1 = p1.clone();
+c1.move(-5, 10);
+console.log(c1.toString());