Data binding makes life very easy. Most templating systems only have one way data binding meaning once the template and model components get merged into a view, any changes to the model are not reflected in the view and and changes in the view are not reflected in the model. With Angular’s two-way data binding, any updates to the view are reflected in the model and any updates to the model are reflected in the view which saves developers time to not have to write code to sync the model and view together.
Appropriately named, directives are rules that tell Angular what to do when building the application. They are markers that exist on a comment, attribute, element, or CSS class name that, when compiled, have the ability to attach specific behavior to the marker. There are built-in directives such as ngBind, ngModel, and ngClass and customizable directives such as event listeners.
Dependency Injection allows application components to be wired together in a very specific way. By definition, dependencies are services or objects that a class needs in order to perform its functions. Angular has strict rules about using dependency injection but at the end of the day make apps flexible, efficient, robust, testable, and maintainable when used correctly.
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