Question

Can someone please provide an example of scope’s $destroy event? Here is the reference documentation from http://docs.angularjs.org/api/ng.$rootScope.Scope#$destroy

$destroy()

Removes the current scope (and all of its children) from the parent
scope. Removal implies that calls to $digest() will no longer
propagate to the current scope and its children. Removal also implies
that the current scope is eligible for garbage collection.

The $destroy() is usually used by directives such as ngRepeat for
managing the unrolling of the loop.

Just before a scope is destroyed a $destroy event is broadcasted on
this scope. Application code can register a $destroy event handler
that will give it chance to perform any necessary cleanup.

Answer 1

Demo: http://jsfiddle.net/sunnycpp/u4vjR/2/

Here I have created handle-destroy directive.

ctrl.directive('handleDestroy', function() {
    return function(scope, tElement, attributes) {        
        scope.$on('$destroy', function() {
            alert("In destroy of:" + scope.todo.text);
        });
    };
});