Angular: Introduction to Zone.js

Level : Advanced
Mentor: Shailendra Chauhan
Duration : 00:02:00

Zone.js in Angular

Zone.js is a critical piece of Angular's change detection mechanism. It helps Angular track asynchronous operations and triggers change detection when necessary. By understanding Zone.js, developers can gain insight into how Angular manages the flow of data and events in their applications.

Example

import 'zone.js';
// Your Angular application code here

Understanding Change Detection

Change detection is at the core of Angular's ability to update the view based on changes in the application state. Understanding how Angular detects and propagates changes is essential for building efficient and responsive applications.

Example

ngAfterViewInit() {
  this.dataService.getData().subscribe(data => {
    this.myData = data;
    this.changeDetector.detectChanges(); // Trigger manual change detection
  });
}

Change Detection Strategies

Angular offers different strategies for optimizing change detection performance. By choosing the right strategy, developers can reduce unnecessary checks and improve the efficiency of their applications.

Example

@Component({
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <div>{{ data }}</div>
  `
})
export class MyComponent {
  @Input() data: string;
}
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