Potential Risks and Suggestions:

File: js/script.js
Code Snippet: return parseInt(num, 10).toLocaleString();
Comment: The new implementation uses parseInt() which will truncate decimal values. If the original function was meant to handle decimal numbers, this could lead to data loss. Consider using parseFloat() or Number() instead to preserve decimal values.

File: js/script.js
Code Snippet: if (isNaN(num)) { throw new Error("Input is not a number"); }
Comment: Throwing an error might cause unexpected behavior in the UI if the filter receives non-numeric input. Consider returning a default value (like "0" or "N/A") or handling the error gracefully instead of throwing an exception.

File: js/script.js
Code Snippet: return parseInt(num, 10).toLocaleString();
Comment: The toLocaleString() method might produce different formatting based on the user's locale settings. The original implementation had a consistent format with single quotes as thousand separators. Ensure this change in formatting is acceptable for all users and doesn't break any UI expectations.

Summary:

This PR changes the implementation of a number formatting filter in what appears to be an AngularJS application. The change replaces a custom number formatting algorithm with JavaScript's built-in toLocaleString() method.

The new implementation is more concise and leverages browser standards, which is generally a good practice. However, there are potential risks with how decimal values are handled, error handling, and locale-specific formatting differences.

Before deploying to production, I recommend:

1. Testing with various inputs including decimal numbers, very large numbers, and edge cases
2. Verifying the new formatting meets business requirements across different locales
3. Ensuring the UI gracefully handles any errors that might be thrown
4. Adding a comment explaining the formatting expectations for future maintainers

This change appears to be a refactoring for improved code quality rather than a functional change, but the formatting differences could impact how numbers are displayed to users.