Self-pushing object constructor

Question

So JavaScript is a functional language, classes are defined from functions and the function scope corresponds to the class constructor. I get it all now, after a rather long time studying how to OOP in JavaScript.

What I want to do is not necessarily possible, so I first want to know if this is a good idea or not. So let's say I have an array and a class like the following:

var Entry = function(name, numbers, address) {
  this.name = name;
  if(typeof numbers == "string") {
    this.numbers = [];
    this.numbers.push(numbers);
  }
  else this.numbers = numbers;
  this.address = address;
};

var AddressBook = [];

And I add contacts with the following function:

function addContact(name, numbers, address) {
  AddressBook.push(new Entry(name, numbers, address));
}

Can't I make it so new Entry() would put itself into AddressBook? If I can't do this on create, it would be interesting to do it with a method in the Entry prototype as well. I couldn't figure out a way to do anything similar.

Answer 1

You could try passing the AddressBook array reference to the function like such:

var Entry = function(name, numbers, address, addressBook) {
  this.name = name;
  if(!(numbers instanceof Array)) {
    this.numbers = [numbers];
  }
  else this.numbers = numbers;
  this.address = address;
  addressBook.push(this);
};

var addressBook = [];

function addContact(name, numbers, address) {
  new Entry(name, numbers, address, addressBook)
}