Grade: 6

Bugs

  • There are several typos and inconsistencies, e.g., the use of both initalized and initialized.
  • The suppresEvents property is not correctly spelt; it should be suppressEvents.
  • The method _isValidXy contains overlapping conditions which could be logically simplified.
  • The makeInvalid method references an app object that is not defined within this context.
  • Use of document.styleSheets in cssRuleExists fails due to potential security restrictions on cross-origin stylesheets.
  • Inconsistent use of null vs undefined in return values.

Optimizations

  • Use parameters validation more thoroughly, such as checking for valid inputs in randInt.
  • The naming convention could be improved for understandability and consistency, e.g., suppres function.
  • Repeated code, such as filtering methods, can be refactored for optimization, like combining filter operations.
  • Use modern ES6+ features, such as default parameters, Spread or Rest operators or ES6 modules, to streamline the code.
  • Better management of state could be achieved through a state management solution or library.
  • Reduce use of console.debug and replace with conditional logging through feature toggles.
  • Use a consistent naming convention for properties and methods (e.g., camelCase).
  • Optimize the reactivity in updating UI elements to avoid unnecessary re-renders.

Good points

  • Modularity by using classes like Puzzle, Row, and Col provides a good separation of concerns.
  • Use of event handling demonstrates a comprehension of the JavaScript event system.
  • Sudoku component as a custom HTML element shows an understanding of modern web technologies.
  • Clear intention for a large part of the code logic supporting a Sudoku game, showing substantial problem domain knowledge.

Summary

The code represents a good attempt at creating a Sudoku-like game with extendable and maintainable constructs using custom elements and modular JavaScript. However, it suffers from certain inconsistencies and potential bugs which can lead to execution errors. Code optimization techniques could be applied to increase performance and maintainability, and to fix some of the identified issues. Thoughtful comments and clearer naming can enhance code readability and understandability.

Open source alternatives