[morse]Angular reactive forms 雙向綁定 (Angular two way binding in reactive forms)

<form [formGroup]="form">
  <input name="first" formControlName="first" [(ngModel)]="example.first"/>
  <input name="last" formControlName="last" [(ngModel)]="example.last"/>
</form>

export class App {
  form: FormGroup;
  example = { first: '', last: '' };

  constructor(builder: FormBuilder) {
    this.form = builder.group({
      first: '',
      last: ''
    })
  }
}