Input(), TypeScript get/set and OnChanges

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import { Component, NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ChildComponent } from './child';
import { OtherChildComponent } from './other-child';

@Component({
  selector: 'my-app',
  template: `
    <my-name [name]="name"></my-name>
    <my-last-name [name]="last"></my-last-name>
  `,
})
export class App {
  name: string;
  last: string;
  
  constructor() {
    this.name = 'Carlos';
    this.last = 'Vega';
    
    setTimeout(() => {
      this.name = 'Miguel';
      this.last = 'Rodriguez';
    }, 2000);
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App, ChildComponent, OtherChildComponent ],
  bootstrap: [ App ]
})
export class AppModule {}

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

@Component({
  selector: 'my-name',
  template: `
      <h2>First name: {{name}} ({{_name}})</h2>
  `,
})
export class ChildComponent implements OnInit {
  private _name: string;
  constructor() {}
  
  get name(): string {
    // transform value for display
    return this._name.toUpperCase();
  }
  
  @Input()
  set name(name: string): void {
    console.log('prev value: ', this._name);
    console.log('got name: ', name);
    this._name = name;
  }
  
  ngOnInit() {
    console.log('on init');
    console.log(this._name);
  }
}

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

@Component({
  selector: 'my-last-name',
  template: `
      <h2>Last name: {{_name}} ({{ name }})</h2>
  `,
})
export class OtherChildComponent implements OnChanges, OnInit {
  @Input() name: string;
  private _name: string;
  constructor() {}
  
  ngOnChanges(changes: SimpleChanges) {
    const name: SimpleChange = changes.name;
    console.log('prev value: ', name.previousValue);
    console.log('got name: ', name.currentValue);
    this._name = name.currentValue.toUpperCase();
  }
  
  ngOnInit() {
    console.log('on init');
    console.log(this.name);
  }
}