Angular JS Course in Mumbai

6. What is an AngularJS service?

Answer: Services are reusable components that handle business logic, data access, and other operations. They are singleton objects and can be injected into other components.

7. Explain the concept of modules in AngularJS

Answer: Modules are containers for different parts of an AngularJS application, such as controllers, services, and directives. They help organize and manage the application’s structure.

8. What is the difference between $scope and $rootScope?

Answer:$scope refers to the application-specific scope and is used within controllers and directives. $rootScope is a global scope accessible across the entire application.

9. How does AngularJS handle routing?

Answer: AngularJS uses the ngRoute module or ui-router to manage routing and navigation within a single-page application, allowing for different views and URLs.

10. What is a filter in AngularJS?

Answer: Filters are used to format and transform data displayed to the user. Examples include currency, date, and uppercase filters.

11. What is the purpose of $http service in AngularJS?

Answer: The $http service is used to make AJAX requests to a server, allowing for communication with external APIs and retrieving data asynchronously.

12. Explain the role of controllers in AngularJS.

Answer: Controllers are responsible for handling the business logic of the application, managing the scope, and responding to user inputs by manipulating the model and view.

13.What is two-way data binding in AngularJS?

Answer: wo-way data binding automatically synchronizes data between the model and view, ensuring that changes in one are reflected in the other without additional code.

14. What are AngularJS expressions and how are they used?

Answer: Expressions are similar to JavaScript expressions and are used within the HTML to bind data from the model to the view. They are enclosed in double curly braces {{ }}.

15. What is a promise in AngularJS?

Answer: A promise is an object representing the eventual result of an asynchronous operation. It is used for handling asynchronous operations like server requests.

16. How can you improve performance in AngularJS applications?

Answer: Performance can be improved by minimizing DOM manipulations, using one-time bindings, lazy loading, optimizing data bindings, and using efficient filters.

17. What is the role of $watch in AngularJS?

Answer: $watch is used to monitor changes to a variable or expression in the scope and execute a function when the value changes.

18. How does AngularJS handle form validation?

Answer: AngularJS provides built-in validation for forms through directives like ng-required, ng-pattern, and ng-minlength. It also offers custom validation options.

19. What are AngularJS filters and how do you use them?

Answer: Filters format data for display, such as transforming text or numbers. They are used within expressions or directives to format data according to specific criteria.

20. Explain the concept of $digest cycle in AngularJS.

Answer: The $digest cycle is AngularJS’s process for checking and updating the data bindings. It continuously monitors for changes in the scope and updates the view accordingly. analytics process also helps in gaining buy-in.