Javascript-coding-guidelines.md

@@ -429,7 +429,11 @@ function sum(a, b) {
 ```javascript
 /**
  * Class representing a dot.
+ * @typedef {Object} Dot
  * @extends Point
+ *
+ *  @property {number} x the x value
+ *  @property {number} y the y value
  */
 class Dot extends Point {
     /**
@@ -439,7 +443,9 @@ class Dot extends Point {
      * @param {number} width - The width of the dot, in pixels.
      */
     constructor(x, y, width) {
-        // ...
+        this.x = x;
+        this.y = y;
+        ...
     }
 
     /**