Hi Kamal,
Watchers on the scope are removed when the scope is destroyed so you don't
need to manually remove them on scope destruction.
One instance where you would need to remove the watcher is if you are
listening to the $rootScope.
var removeWatcher = $rootScope.$watch($attr.ngIf, function
ngIfWatchAction(value) {
...
}
$scope.$on('destroy', function destroy() { removeWatcher() });
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