Angular v16(blog.angular.io)

  import React from 'react';

  function HelloWorld() {
    return (
      <div>
        <h1>Hello, World!</h1>
      </div>
    );
  }
  export default HelloWorld;

  import React from 'react';
  import ReactDOM from 'react-dom';
  import HelloWorld from './HelloWorld';

  ReactDOM.render(<HelloWorld />, document.getElementById('root'));

  import { Component } from '@angular/core';

  @Component({
    selector: 'app-hello-world',
    template: `
      <div>
        <h1>Hello, World!</h1>
      </div>
    `,
  })
  export class HelloWorldComponent {}

  import { BrowserModule } from '@angular/platform-browser';
  import { NgModule } from '@angular/core';
  import { AppComponent } from './app.component';
  import { HelloWorldComponent } from './hello-world.component';

  @NgModule({
    declarations: [AppComponent, HelloWorldComponent],
    imports: [BrowserModule],
    providers: [],
    bootstrap: [AppComponent],
  })
  export class AppModule {}

  import { Component } from '@angular/core';

  @Component({
    selector: 'app-root',
    template: `
      <app-hello-world></app-hello-world>
    `,
  })
  export class AppComponent {}

    http$
        .pipe(
            map(res =>     res['payload']),
            catchError(err =>     {
                console.log('caught mapping error and rethrowing', err);
                return throwError(err);
            }),
            finalize(() =>     console.log("first finalize() block executed")),
            catchError(err =>     {
                console.log('caught rethrown error, providing fallback value');
                return of([]);
            }),
             finalize(() => console.log("second finalize() block executed"))
    )
        .subscribe(
            res => console.log('HTTP response', res),
            err =>     console.log('HTTP Error', err),
            () =>     console.log('HTTP request completed.')
    );