Angular Interview Practice

How does Angular handle asynchronous data updates?

1. It completely resets the application state

2. Zone.js triggers change detection to update the view

3. It pauses until all data is loaded

4. It ignores asynchronous events by default

The correct answer is: Zone.js triggers change detection to update the view

Angular utilizes Zone.js to manage asynchronous data updates efficiently. When an asynchronous operation occurs, such as an HTTP request or a timer, Zone.js intercepts these events and triggers Angular's change detection mechanism automatically. This process ensures that the view reflects the most current state of the application without requiring manual intervention from the developer. This automatic detection allows the application to remain responsive and up-to-date, making it easier to work with dynamic data. Instead of requiring explicit change detection calls, Angular effectively listens for events and refreshes the UI as needed, streamlining the development experience and improving performance. While the other options suggest different behaviors, they do not accurately reflect how Angular is designed to handle asynchronous operations. For example, resetting the application state or pausing until all data is loaded would hinder performance and user experience, and ignoring asynchronous events would fail to provide a robust and interactive application.