What is the rationale behind not passing $scope to a service in AngularJS, and is it considered bad practice?

Is it advisable not to pass $scope to a service for certain reasons?

I understand that services are intended to be reusable singletons, and passing a (potentially) large object to the service could lead to maintenance issues. However, assuming there is solid documentation declaring "the following members of $scope are required," I believe it can result in cleaner code compared to passing multiple parameters.

If there are any other concerns regarding this practice, I would appreciate hearing them as I am being evaluated on this specific piece of code! :)

By the way, I have just realized how active the angularJS community is here, and I am truly grateful for it!!

javascriptangularjsangularjs-scope

Answer №1

Check out this insightful article 5 Tips To Avoid Scope Confusion in Angular

The author elaborates on why passing $scope to Services is not recommended in point 5.

Here are some key points from the article:

Relying on values set by parent controllers or having child controllers set data back on the parent scope creates implicit coupling that can be hard to identify initially.

This leads to controller implementations being tightly dependent on the binding order in the view, making it challenging to use or test them independently due to their coupling via $scope.

$scope should act as a bridge between View and Controller. Instead of passing $scope values directly to a service, extract those values and pass them separately.

If you find yourself needing to pass too many values, consider grouping them into objects before passing.

Even small changes to $scope can have unintended consequences for your application.

It's considered an anti-pattern to utilize $scope outside of controllers.

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