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https://stackoverflow.com/questions/51727317/angular-6-call-and-pass-a-function-from-parent-to-child-component/51727452

export class PArentComponent {

  fn = function() {
    console.log('hello');
  };
}

 <app-child [function]="fn"></app-child>

export class ChildComponent implements OnInit {

  @Input() function: any;

 ngOnInit() {
       this.function();
 }
}