Creating and deleting jokes

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

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule, Input, EventEmitter, Output} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'


class Joke {
  setup: string;
  punchline: string;
  hide: boolean;
  
  constructor(setup: string, punchline: string) {
    this.setup = setup;
    this.punchline = punchline;
    this.hide = true;
  }
  
  toggle() {
    this.hide = ! this.hide;
  }
}

@Component({
  selector: 'joke-form',
  template: `
  <div class="card card-block">
    <h4 class="card-title">Create Jake</h4>
    <div class="form-group">
      <input type="text"
             class="form-control"
             placeholder="Enter the setup"
             #setup>
    </div>
    <div class="form-group">
    <input type="text"
             class="form-control"
             placeholder="Enter the punchline"
             #punchline>
    </div>
    <button type="button"
            class="btn btn-primary"
            (click)="createJoke(setup.value, punchline.value)">Create
    </button>
  </div>
  `
})
class JokeFormComponent {
  @Output() jokeCreated = new EventEmitter<Joke>();
  
  createJoke(setup: string, punchline: string) {
    this.jokeCreated.emit(new Joke(setup, punchline));
  }
}

@Component({
  selector: 'my-app',
  template: `
  <div class="card card-block" style="weight: 5em;">
    <h4 class="card-title">{{joke.setup}}</h4>
    <p class="card-text" [hidden]="joke.hide">{{joke.punchline}}</p>
    <button class="btn btn-primary"
      (click)="joke.toggle()">Response
    </button>
    <button class="btn btn-danger" (click)="deleteItem()">Delete
    </button>
  </div>
  `,
})
export class App {
  @Input("joke") joke: Joke;
  @Output() jokeDeleted = new EventEmitter<Joke>();
  
  deleteItem() {
    this.jokeDeleted.emit(this.joke)
  }
}

@Component({
  selector: 'joke-list',
  template: `
  <joke-form (jokeCreated)="addJoke($event)"></joke-form>
  <my-app *ngFor="let j of jokes" [joke]="j" (jokeDeleted)="deleteJoke($event)"></my-app>
  `
})
class JokeListComponent{
  jokes: Joke[];
  
  constructor() {
    this.jokes = [
      new Joke("Joke1", "punchline1")
      new Joke("Joke2", "punchline2")
      new Joke("Joke3", "punchline3")
    ];
  }
  addJoke(joke) {
    this.jokes.unshift(joke);
  }
  
  deleteJoke(joke) {
    let indexToDelete = this.jokes.indexOf(joke);
    if (indexToDelete !== -1) {
      this.jokes.splice(indexToDelete,1);
    }
  }
}

@Component({
  selector: 'app',
  template: `
  <joke-list></joke-list>
  `
})
class AppComponent {}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App, JokeListComponent, JokeFormComponent, AppComponent ],
  bootstrap: [ AppComponent ]
})
export class AppModule {}