Question

Is something like this possible:

function FooClass()
{
   var barsArray=new Array();
   var index=0;

   function addBar()
   {
     barsArray[index]=new BarClass(index);
   }
}

function BarClass()
{
   var myIndex;
   function BarClass(index)
   {
      myIndex=index;
   }
}

Answer 1

I’m inferring that you want to have a Foo object, and that Foo object should contain an array of Bar objects. Each Bar object should know its array index within its parent Foo object.

If that is an accurate description, then try this:

function BarClass(idx) {
    this.myIndex = idx;
}

function FooClass(howMany) {
    this.barsArray = [];

    for (var x = 0; x < howMany; x++) {
        this.barsArray[x] = new BarClass(x);
    }

}

var foo = new FooClass(5);
// foo.barsArray[0].myIndex === 0
// foo.barsArray[1].myIndex === 1
// foo.barsArray[2].myIndex === 2
// foo.barsArray[3].myIndex === 3
// foo.barsArray[4].myIndex === 4
// foo.constructor === 'FooClass'
// foo.barsArray[0].constructor === 'BarClass'

Good luck!