Update constructor signatures

package.json

@@ -20,7 +20,8 @@
     "predeploy": "npm run dist",
     "lint": "eslint src --ext .ts",
     "lint:fix": "eslint src --ext .ts --fix",
-    "format": "prettier --write ./src/**/*.ts"
+    "format": "prettier --write ./src/**/*.ts",
+    "test": "jest"
   },
   "devDependencies": {
     "@jest/globals": "^29.7.0",

src/vector2d.test.ts

@@ -120,11 +120,11 @@ describe("Vector2D", () => {
     expect(result.getY()).toBeCloseTo(1);
   });
 
-  test('lerp interpolates correctly', () => {
+  test("lerp interpolates correctly", () => {
     const vector1 = new Vector2D(0, 0);
     const vector2 = new Vector2D(10, 10);
     const result = vector1.lerp(vector2, 0.5);
     expect(result.getX()).toBe(5);
     expect(result.getY()).toBe(5);
-});
+  });
 });

src/vector2d.ts

@@ -2,14 +2,32 @@ export class Vector2D {
   private x: number;
   private y: number;
 
+  constructor();
+  /**
+   * Creates a new vector with coordinates of provided Vector2D.
+   * @param {Vector2D} vec - The x-coordinate.
+   */
+  constructor(vec: Vector2D);
   /**
    * Creates a new vector with coordinates (x, y).
-   * @param {number} x - The x-coordinate.
+   * @param {number} a - The x-coordinate.
-   * @param {number} y - The y-coordinate.
+   * @param {number} b - The y-coordinate.
    */
-  constructor(x: number = 0, y: number = 0) {
+  constructor(a: number, b: number);
-    this.x = x;
+
-    this.y = y;
+  constructor(a?: number | Vector2D, b?: number) {
+    if (a === undefined && b === undefined) {
+      this.x = this.y = 0;
+      return;
+    }
+
+    if (a instanceof Vector2D) {
+      this.x = a.x ?? 0;
+      this.y = a.y ?? 0;
+    } else {
+      this.x = a ?? 0;
+      this.y = b ?? 0;
+    }
   }
 
   /**
@@ -130,7 +148,7 @@ export class Vector2D {
    * @returns {Vector2D} The cloned vector.
    */
   clone(): Vector2D {
-    return new Vector2D(this.x, this.y);
+    return new Vector2D(this);
   }
 
   /**