communicationcomponent5.js

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

@Component({
    selector: 'appchild',
    template: `<h2>Hi {{_greetMessage}}</h2>`
})
export class AppChildComponent  implements OnInit{


        _greetMessage : string; 
        constructor(){

        }   
        ngOnInit(){

        }

    @Input()
        set greetMessage(message : string ){
            this._greetMessage = message+ " manipulated at child component"; 
        }
        get greetmessage(){
            return this._greetMessage;
        }

    }