W3Schools Tryit Editor

main.ts

index.html

import { bootstrapApplication } from '@angular/platform-browser';
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  standalone: true,
  template: `
    <h3>Null-Safe Navigation (?.)</h3>
    <button (click)="toggle()">Toggle user</button>
    <p>Email: {{ user?.profile?.email || '(none)' }}</p>
  `
})
export class App {
  user: { profile?: { email?: string } } | undefined = undefined;
  toggle(){ this.user = this.user ? undefined : { profile: { email: 'a@example.com' } }; }
}

bootstrapApplication(App);

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Angular Templates</title>
</head>
<body>
  <app-root></app-root>
</body>
</html>