Javascript Arrays as an object field

I am running into a problem with using an array as a Javascript field.

var Object = function () {

  var admins = [];

  this.addAdmin = function(admin){
    this.admins.push(admin)
  }

}

Normally I would expect admin to be pushed into the array admins but instead I get a ‘cannot read property ‘push’ of undefined’.

If I’m not mistaken when I initialized the Object with new Object(), admins = []; should initialize the array. Is this a limitation of Javascript?

Thank you in advance.

>Solution :

var array creates a local variable. It does not create a property on the object.

You need:

this.admins = [];

or

admins.push(admin) /* without this */