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using System.Text;
using System.Text.RegularExpressions;

public static class StringExtension
{
    /// <summary>
    /// Remove unicode character (unicode) of given string
    /// </summary>
    /// <param name="input">The input string to remove mark</param>
    /// <returns>The string without mark</returns>

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class ProductViewModel {
  final BehaviorSubject<List<Product>> _products = new BehaviorSubject(); // đây, angular dev quen không : ))
  Stream<List<Product>> get products$ => _products.stream; // getter
  
  Future fetchProductsAsync() async {
    var products = await loadProductsFromApi();
    _products.add(products); // _products.next(products) in rxjs
    // _products changes thus products$ changes
  }
  

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class Product extends StatefulWidget {
  @override
  _ProductState createState() => _ProductState();
}

class _ProductState extends State<Product> {
  final ProductViewModel _productvm = ProductViewModel();
  
  @override
  void initState() {

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@Component({
  selector: "app-product",
  templateUrl: "./app-product.component.html",
  styleUrls: ["./app-product.component.scss"]
})
export class ProductComponent implements OnInit {
  products: Product[];

  constructor(private readonly productService: ProductService) {}

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class StreamBuilderObserver extend StatelessWidget {
  final Function onWaiting;
  final Function onSuccess;
  // constructor
  
  @override
  Widget build(BuildContext context) {
    return StreamBuilder {
      builder: (BuildContext context, AsyncSnapshot snapshot) { // need to return a Widget
        if (snapshot.hasData) {

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// fake code, it might now work :)

public class CacheHelper
{
  public string GetOrSetConfig(string key, Func<string> factory)
  {
    var cached = CacheProvider.Get<string>(key);
    if (string.IsNullOrWhiteSpace(cached)) {
      cached = factory();
    }

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class productService {
  Future<List<Product>> getProductsAsync() async {
    var response = await http.get("/api/products");
    var products = (response.body as Iterable).map((x) => Product.fromJson(x)).ToList();
    
    return products;
  }
}

oclockvn

public class ProductService
{
  public async Task<List<Product>> GetProductsAsync()
  {
    var products = await db.Products.Where(...).ToListAsync();
    
    return products.
  }
}

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// product.dart

// no namespace
class Product 
{
  String name;  
  Product(String name) { this.name = name; }  
  // Syntactic sugar for setting prop
  // Product(this.name)
  

oclockvn

// Product.cs

namespace AwesomeApp
{
  public class Product 
  {
    public string Name { get; set; }
    public Product(string name) { this.Name = name; }
    
    public void PrintName() {