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communication between components in angular

Ed Brannin 
3 ways to communicate data between Angular components
Parent to Child: Sharing Data via Input
Child to Parent: Sharing Data via ViewChild with AfterViewInit
Child to Parent: Sharing Data via Output() and EventEmitter
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4.14
7
Holland park 80 points 

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

@Component({
  selector: 'app-child',
  template: `
      <button (click)="sendMessage()">Send Message</button>
  `,
  styleUrls: ['./child.component.css']
})
export class ChildComponent {

  message: string = "Hola Mundo!"

  @Output() messageEvent = new EventEmitter<string>();

  constructor() { }

  sendMessage() {
    this.messageEvent.emit(this.message)
  }
}

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