Application Quality in Angular

Application Quality is a chapter of the free Angular tutorial. A working app is not finished until it handles problems well and stays fast. Users meet errors, slow networks and long lists every day, and they judge your app by how it behaves in these moments.

What each lesson covers:

• Error Handling: Runtime, dependency injection and routing errors, global error handling with ErrorHandler and a custom error handler, fallback UI for users, error logging for developers, debugging techniques and Angular DevTools.
• Performance Optimization: Why performance matters and how to measure it, lazy loading and bundle optimization, how change detection works, the Default and OnPush strategies, track in @for and trackBy in *ngFor, and best practices for fast rendering.

Every practice block runs real Angular in your browser. Several blocks count the work that Angular does, so you can see the difference that each technique makes.

Lessons in this section

1. Error Handling

   Finding and handling errors: runtime, dependency injection and routing errors, ErrorHandler and a custom error handler, fallback UI, error logging, debugging and Angular DevTools.

2. Performance Optimization

   Making apps fast: measuring performance, lazy loading, bundle optimization, change detection with Default and OnPush, track in @for, trackBy in *ngFor, and rendering best practices.