100+ Angular JS Interview Questions for JavaScript Web Developers

The AngularJS is one of the popular JavaScript frameworks, I think most popular after jQuery, with the core goal of simplification. It allows building dynamic, single page web apps (SPAs) using JavaScript and supports the Model View Controller (MVC) programming structure. It has used widely and even big companies like Google, Virgin America, and HBO are using Angular JS to build their site. The demand for web developers is on all time high and there is a huge demand for developers who understand modern JavaScript frameworks e.g. Angular JS, jQuery, Facebook's React JS etc. The Angular JS is Open-source, front-end JavaScript framework which is developed by Google, it mainly competes with Facebook's ReactJS framework.

AngularJS handles the heavy lifting of DOM manipulation and AJAX glue that once had to be coded from scratch and encourages the developer to use modular building blocks of JavaScript code that can be categorized and are easy to test. You can add Angular JS to any HTML page using <script> tag.

If you are preparing for web developer interview and Angular JS is mentioned in the Job description then you will find the following list of Angular JS interview questions useful. These are some of the frequently asked Angular JS Interview questions which have been asked too many JavaScript developers and it covers all important topics of Angular JS. You can use this list to quickly check your preparation or to get an idea of what to expect on a JavaScript or Angular JS interview.

Angular JS Interview Questions

1) What is Angular JS framework? What are some important features of Angular JS?

2) Why should you use Angular JS over ReactJS?

3) What is the difference between MVVM and MVC and MVP?

4) What is a single page application? How can one create a single-page application using AngularJS? Which provider is used to achieve this objective?

5) How does Angular JS application bootstrap?

6) How to manual bootstrap AngualrJS?

7) AngularJS Initialization & rendering process?

8) What is the execution order of Controller, Filters, Service, Factory, Config and Run in Angular JS?

9) What is the difference between jqLite vs jQuery?

10) What are different types of binding in Angular JS?

11) What is two-way data binding in Angular JS?

12) What is ng-model directive in AngularJS?

13) Why ng-init is used in Angular?

14) Difference Between expression{{}} and ng-bind in AngularJS?

15) What is the use of ng-repeat in Angular?

16) What if a duplicate element in ng-repeat?

17) How to display unique element in ng-repeat?

18) How to apply switch case in Angular JS?

19) What is the difference between service and factory in AngularJS?

20) Is service and factory singleton object?

21) How angular has to implement singleton pattern in factory and service?

22) One scenario where services can't be used?

23) What is the meaning of # in the URL?

24) Explain UI Routing in AngularJS?

25) Abstract state in UI routing?

26) What is the difference between ng routing vs UI routing in Angular?

27) Authorization in ng-routing?

28) What is the difference between scope and $scope?

29) Explain some benefits of controller As?

30) Explain Lazy loading of controllers?

31) How to check current running controller?

32) Communication between two controllers

33) What are the ajax calls?

34) What are asynchronous means?

35) What are promises in Angular JS?

36) What are interceptors in Angular JS?

37) What is dependency injection? How to add a dependency in angular?

38) What is digest cycle and how you can stop it?

39) How to check digest cycle is in progress?

40) What is $destroy?

41) What is ng-transclude?

42) How you can all method of a controller in the directive ?

43) Different types of directives?

44) Controller vs link in the directive ?

45) Pre-link vs Post Link vs Compile functions?

46) What is the best way to manipulate DOM and how can we do?

47) Directive restrict type?

48) Events in angular?

49) Restrict types in angular?

50) Custom exceptions in angular?

51) Filters in angular?

52) The custom filter in angularjs?

53) What are decorators?

54) Providers in angular?

55) Session management in angular?

56) Explain Authentication and Authorization in angualrjs?

57) What is localization? How can we achieve the localization?

58) What is local Storage?

59) What is session storage?

60) What is the difference between the local Storage and Session Storage?

61) How to speed up rendering UI?

62) The directory structure of angular js app?

63) Can you explain some Best practices of Angular JS?

64) How to remove ng-classes and directive information from DOM?

65) What is angular 2?

66) What is the difference between Angular JS 1.x and 2?

67) How Angular 2 is rendering DOM?

68) What is a grunt? Why we use it?

69) Why we use grunt other than minification?

70) What is gulp?

71) What are the new things in available in html5?

72) What is Two way binding in Angular JS?

73) What is Ng-Bind in Angular JS?

74) What is One-way binding

75) Directives types

76) Difference between $http vs $resource in Angular JS?

77) Explain Dependency injection In Angular JS

78) Explain Methods of $http service

79) How to initiate angular data

80) How do you unit test an AngularJS filter?

81) What should be the maximum number of concurrent "watches? How would you keep an eye on that number?

82) How do you share data between controllers in Angular JS?

83) What is the difference between ng-show/ng-hide and ng-if directives?

84) What is a digest cycle in AngularJS?

85) Should you use AngularJS together with jQuery?

99 Angular JS Interview Questions for Web Developers

86) How would you specify that a scope variable should have one-time binding only?

87) Explain how $scope.$apply() works?

88) Does angular.copy() method deep copy or shallow copy?

89) When should you use an attribute versus an element in Angular JS?

90) How do you reset a $timeout, $interval(), and disable a $watch()?

91) Explain what is a $scope in AngularJS?

92) What is a singleton pattern and where we can find it in Angularjs?

93) What is an interceptor? What are common uses of it?

94) How does interpolation, e.g. "{{ someModel }}", actually work?

95) What is $rootScope and how does it relate to $scope?
Answer: The $rootScope is the parent object of all $scope Angular objects created in a web page.

96) Explain the role of $routeProvider in AngularJS?

97) How do you hide an HTML element via a button click in AngularJS?

98) How do you disable a button depending on a checkbox’s state in Angular?

99) How would you implement application-wide exception handling in your Angular app?

That's all about some of the frequently asked Angular JS Interview Questions. You might have seen many of these questions already on your interview, as it contains questions from both telephonic and face-to-face interviews. This list of questions is good to check your preparation. If you can answer all of these questions in detail then you are good for the Angular JS job interview. You can also use this list to prepare for the topics and explore Angular JS in detail.

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