communication between two sibling components without using service in angular2/4

Question

I have a two sibling component like app-event and app-object inside one root component and I have array of objects inside app-object component ,now i want to pass that array of object in app-event sibling component, how can i do that in angualr2/4 in very simple way?

 <div class="jumbotron">
     <div class="container">
    <div class="col-sm-8 col-sm-offset-2">
        <app-object></app-object>
        <app-event></app-event>
      </div>
  </div>

this is my model file

export class dataObject{

  constructor(public item:string, public amount : number, public available:boolean){
     }
  }

this is app-object component ts file

    import { Component, OnInit } from '@angular/core';
    import { dataObject} from './app-object.model'

    @Component({
     selector: 'app-object',
     templateUrl: './app-object.component.html',
     styleUrls: ['./app-object.component.css']
   })

   export class AppObjectComponent implements OnInit {

 data:dataObject[]=[new dataObject('itemA',45,true), new dataObject('itemB',58,false)];

  constructor() {
  console.log(this.data);
 }

 ngOnInit() {
 }

 }

Now the app-event component ts file code where i want to have the data of app-object file(data variable-array of object)

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

 @Component({
 selector: 'app-event',
 templateUrl: './app-event.component.html',
 styleUrls: ['./app-event.component.css']
})

  export class AppEventComponent implements OnInit {

  // here inside this class i want to have data of app-object component....

     constructor() { }

    ngOnInit() {
  }

 }

Answer 1

<app-object #obj></app-object>
<app-event [data]="obj.data"=></app-event>

AppEventComponent needs

@Input()
data:dataObject[];

for this to work.

Answer 2

Use @ViewChild to achieve this

<div class="jumbotron">
     <div class="container">
    <div class="col-sm-8 col-sm-offset-2">
        <app-object></app-object>
        <app-event></app-event>
      </div>
  </div>

Create two ViewChild() objects as below

@ViewChild(AppObjectComponent) appObjectComponent : AppObjectComponent;
@ViewChild(AppEventComponent) appEventComponent : AppEventComponent;

Declare the variables as public so that it can be accessed from here.

In your AppObjectComponent

arrayVariable:any[];

In your AppEventComponent

array2:any[]

The method in your parent component will be as

someEvent(){
    this.appObjectComponent.arrayVariable = this.appEventComponent.array2 ;
}