I am kinda new to Angular JS, and am trying to figure out a elegant 
solution to watch each object in a array for its property changes.
I know the way to deep watch an array is by:

$scope.$watch("collection",function( newValue, oldValue ) {
    /* do something*/
 }, true );

But the newValue, oldValue doesn't give away exactly which object in the array 
has changed. 
Other way I can think of is to loop the array and set a watch on each object in 
the array. 

Is there a better solution to this?

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