The Angular-specific property on enumerated objects $$hashKeycan be used for a lot of things.

For example DOM-targeting;

<div ng-repeat=obj in objects>

    <label for=field-{{obj.$$hashKey}}>

        Label

    </label>

    <input type=text id=field-{{obj.$$hashKey}} />

</div>

In some weird case I am experiencing now the $$hashKey prop is not yet set on a object I want to access it on even though it is being repeated with Angular.
Is there a way to set this property yourself when initializing the object?

Edit: My guess is that there is some form of execution order issue, that I access the property when Angular has yet to process the repetition.
I am deep watching an object, within that object is an array with objects which is getting repeated. It's also on one of those objects that I need to access the $$hashKey property on.

Simple example;

var MyController = function($scope, Obj)

{

    $scope.obj = {

        list: [obj, obj, obj, obj]

    };



    $scope.$watch(obj, function()

    {

        var lastObj = $scope.obj.list[$scope.obj.list.length - 1];

        console.log(lastObj.$$hashKey); // Undefined?

    }, true);



    $scope.addObj = function()

    {

        $scope.obj.list.push(new Obj());

    };

};

Edit2: jsFiddle http://jsfiddle.net/2sbWp/2/