How to fire a function at the same moment of using "new" constructor?

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So I have instance of a class and I would like to register all created users. Ideally would it be to add them to a variable inside of a "User" class or if it's not possible, to global variable "users". I was trying to create self invoking function inside that class, but it didn't work, same with a variable. The goal is to register users, when new user is created by using "new" operator.

How can I do that ??

    var users;

        class User {
            constructor(email, name) {
                this.email = email;
                this.name = name;  
            }
        }

    var user1 = new User("john@sds.com", "John");
    var user2 = new User("san@wp.com", "San");

Depending on your requisites, you can use weakMaps, and add the new user on each constructor call. This will let you store a weak reference to each new User created, preventing memory leaks, in case any User is deleted.

    var users = new WeakMap();

    class User {
        constructor(email, name) {
            this.email = email;
            this.name = name;  
            users.set(this, email)
        }
    }

var user1 = new User("john@sds.com", "John");
var user2 = new User("san@wp.com", "San");

If you need to enumerate them , you would need to use an array, but the user should be removed from the array manually , when the user is deleted

    var users = [];

    class User {
        constructor(email, name) {
            this.email = email;
            this.name = name;  
            users.push(this)
        }
    }

var user1 = new User("john@sds.com", "John");
var user2 = new User("san@wp.com", "San");

In JavaScript, how can I have a function run at a specific time , However, let's consider for a moment that JavaScript is your only option. not using it in the same context; Apple is just giving you an interface for using another​  At the same time, do not jeopardize your company's success, a department's success, or your employees' success, to retain an underperforming employee. Fire the employee to ensure the success of your other employees and your business. The steps that you take when you prepare to fire an employee matter.

No clue if this is close to what you want but give it a try.

var users = [];
var newUser = (function() {
  class User {
    constructor(email, name) {
      this.email = email;
      this.name = name;  
    }
  }

  return function(email, name) {
    var user = new User(email, name);
    users.push(user);
    return user;
  }
 })();
 
 
var user1 = newUser("john@sds.com", "John");
var user2 = newUser("san@wp.com", "San");

console.log(users[0], user1);
console.log(users[1], user2);

Multiple threads calling the same function at the same time, The threaded function call several other functions to perform operations, but For the moment I haven't get any datamix, but can it be happen? interfere with other threads or other calls of the same function in the call stack. Moments can be calculated from the definition or by using so ca lled moment gen- erating function. Definition 1.13. The moment generating function (mgf) of a random variable X is a function MX : R → [0,∞)given by MX(t) = EetX, provided that the expectation exists for t in some neighborhood of zero.

In this answer given by @colxi, the one issue I see is the User class is tightly coupled to the users array variable. What if in future you need to maintain two or even more separate lists like adminUsers, moderatorUsers.

I would use a function to handle the creation of user and push the user into the users list.

This code is very much similar to what was already suggested but I have implemented Sepration of Concerns principle

This way your User class need not worry about the users list or anything else outside of it. We now have a separate function that takes care of updating the users list everytime a new user is created. And your user class can be moved to a separate js file which can be imported in any other js file that needs to create (any type of ) user.

class User {
    constructor(email, name) {
        this.email = email;
        this.name = name;  
    }
}

var users = [];
function createUser(name,email) {
  var user = new User(name,email);
  users.push(user);
  return user;
}

var user1 = createUser("john@sds.com", "John");
var user2 = createUser("san@wp.com", "San");

The Engineer, see two of his sailors thrusting their heads through the hole at the same moment. Accuracy of fire is a comparative term, and is said to be good when a group of that is to say, that the probability of a deviation is a function of the deviation. Moments and Moment Generating Functions. Measures of central tendency and dispersion are the two most common ways to summarize the features of a probability distribution. Expected value and variance are two typically used measures. Other features that could be summarized include skewness and kurtosis.

Equations of Eternity, Speculations on Consciousness, Meaning, and , It is not correct to say a particle "collided with the film and produced a visible trace​. At that moment of interaction, the wave function was forced to abandon its at work, here and now: the making of the real from the unreal, the breathing of fire into the At that same moment, the wave function has to undergo a sudden and​  We know that E (X2) is not quite the Variance of X, but it can be used to find the Variance. That is, Var (X) = E (X2) − E (X)2, or the Variance equals the second moment minus the square of the first moment (recall how LoTUS can be used to find both expectation and variance).

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Variable scope, Variables, declared with const , behave the same, so this article is about const too. We can use the variable since this moment. phrase is assigned a During the function call we have two Lexical Environments: the inner  There's a couple of ways you can do this. If the onchange listener is a function set via the element.onchange property and you're not bothered about the event object or bubbling/propagation, the easiest method is to just call that function: element.onchange(); If you need it to simulate the real event in full, or if you set the event via the

Comments
  • Can you not push each new User to an array and use that as your global.
  • You can create a factory that will create your instances of User and systematically add them to your array
  • You should show an attempt your tried because then it is possible to tell you why this did not work.
  • @t.niese I was basically trying to put self invoking function and add to a global variable, but get errors. Basically i don't know if self invoking functions can be added, cause it was the problem to start with.
  • That's what you already wrote in the question? I meant to show some code you have tried and the error message you got. That way you not only get a solution like now, but you will also learn why your attempt did not work and why.
  • Oh, I didn't know that answer could be that simple. I mean 2nd part was that what I was looking for. Thanks.
  • I disagree with adding the newly created instance into something else (An array in this case) inside the constructor. That is too tightly coupled. And is prone to bug, overly complex code or breakage if you forget to create the array. And a WeakMap is overkill