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<div class="col-sm-2">
    <button class="btn btn-default" (click)="deleteUser(user)">Delete</button>
</div>

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@Injectable()
export class UserService {
    
    constructor(private http: Http) { 
    }

    deleteUser(user:User): Observable<any>{
        return this.http.post("http://localhost:3000/deleteUser", { id: user._id })
        .map((res:any) => {
            return res.json();

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router.post('/deleteUser', function(req, res, next) {
  User.remove({_id : req.body.id}, function(err) {
    if (err) {
      console.log("not removed!");
      res.status(400);      
      res.send();
    }

    console.log("removed!");
    res.send({status: 'ok'});

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String s = null;
Console.Write(s);

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String? s = null;
Console.Write(s);

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int x = 1;
int y = 1;
retrun x == y; //retruns true

var x = new SomeType();
var y = new SomeType();
return x == y, //returns false

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public class Student(string Name, decimal Gpa);

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public class Student : IEquatable<Student>
{
    public string Name { get; }
    public decimal Gpa { get; }
    public Student(string Name, decimal Gpa)
    {
        this.Name = Name;
        this.Gpa = Gpa;
    }
    public bool Equals(Student other) // for IEquatable<Student>

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IAsyncEnumerable<Data> someData =  
    searchEngine.Get(query);

foreach await (var data in someData) { // ... }  

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await Task.Run(() => disposableEntity.Dispose());