What is Angular Event Emitter and how do I use it?

Can you explain what Angular Event Emitter is?

Angular Event Emitter is a class that allows you to create custom events in Angular applications. It helps in communication between components.

How do I implement Event Emitter in my Angular component?

To implement Event Emitter, first import it from '@angular/core'. Then, create an instance of EventEmitter and use the emit() method to trigger events.

Can you give me a code example?

Sure! Here's a simple example:

import { Component, EventEmitter, Output } from '@angular/core';

@Component({
  selector: 'app-my-component',
  template: `<button (click)="notify()">Notify</button>`
})
export class MyComponent {
  @Output() myEvent = new EventEmitter<string>();

  notify() {
    this.myEvent.emit('Hello from MyComponent!');
  }
}

What are some best practices for using Event Emitter?

Some best practices include using EventEmitter for component communication only, unsubscribing from events to prevent memory leaks, and using it sparingly to avoid complex event chains.