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## AngularJS ( v1.7.x ) Interview Questions with Example
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## AngularJS Interview Questions with Example ( Updated upto v1.7.x )
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### 1. Basics
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|Sl.No| Questions |
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|-----|-----------------------------------------------------------------------|
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| 01. |[What are the differences between `Provider` vs `Factory` vs `Service`?](#q-what-are-the-differences-between-provider-vs-factory-vs-service-)|
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| 02. |[How do you prefer to develop the data access layer which communicate with REST service?](#q-how-do-you-prefer-to-develop-the-data-access-layer-which-communicate-with-rest-service)|
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| 03. |[Which service do you use: `$http` or `$resourse` or `rest-angular`?](#q-which-service-do-you-use-http-or-resourse-or-rest-angular-)|
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| 04. |[How can you configure `$http` service?](#q-how-can-you-configure-http-service)|
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| 05. |[What about `q` and promises in angularjs?](#q-what-about-q-and-promises-in-angularjs)|
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| 06. |[Explain Event model in angularjs?](#q-explain-event-model-in-angularjs)|
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| 07. |[Do you use some sort of angular style guides?](#q-do-you-use-some-sort-of-angular-style-guides)|
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| 08. |[What is dependency injection? Explain difference between inline and explicit annotation?](#q-what-is-dependency-injection-explain-difference-between-inline-and-explicit-annotation)|
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| 09. |[What is auto bootstrap process in AngularJS?](#q-what-is-auto-bootstrap-process-in-angularjs)|
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| 10. |[What is manual bootstrap process in AngularJS?](#q-what-is-manual-bootstrap-process-in-angularjs)|
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| 11. |[How AngularJS is compiled?](#q-how-angularjs-is-compiled)|
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| 12. |[What should be the maximum number of concurrent "watches"? How would you keep an eye on that number?](#q-what-should-be-the-maximum-number-of-concurrent-watches-how-would-you-keep-an-eye-on-that-number)|
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| 13. |[Where should we implement the DOM manipulation in AngularJS?](#q-where-should-we-implement-the-dom-manipulation-in-angularjs)|
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| 14. |[How `$digest` works?](#q-how-digest-works)|
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| 15. |[What is a digest cycle in AngularJS?](#q-what-is-a-digest-cycle-in-angularjs)|
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| 16. |[Explain how $scope.$apply() works?](#q-explain-how-scope-apply-works)|
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| 17. |[What makes the angular.copy() method so powerful?](#q-what-makes-the-angularcopy-method-so-powerful)|
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| 18. |[What is a singleton pattern and where we can find it in AngularJS?](#q-what-is-a-singleton-pattern-and-where-we-can-find-it-in-angularjs)|
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| 33. |[What are the differences between `Provider` vs `Factory` vs `Service`?](#q-what-are-the-differences-between-provider-vs-factory-vs-service-)|
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| 34. |[How do you prefer to develop the data access layer which communicate with REST service?](#q-how-do-you-prefer-to-develop-the-data-access-layer-which-communicate-with-rest-service)|
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| 35. |[Which service do you use: `$http` or `$resourse` or `rest-angular`?](#q-which-service-do-you-use-http-or-resourse-or-rest-angular-)|
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| 36. |[How can you configure `$http` service?](#q-how-can-you-configure-http-service)|
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| 37. |[What about `q` and promises in angularjs?](#q-what-about-q-and-promises-in-angularjs)|
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| 38. |[Explain Event model in angularjs?](#q-explain-event-model-in-angularjs)|
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| 39. |[Do you use some sort of angular style guides?](#q-do-you-use-some-sort-of-angular-style-guides)|
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| 40. |[What is dependency injection? Explain difference between inline and explicit annotation?](#q-what-is-dependency-injection-explain-difference-between-inline-and-explicit-annotation)|
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| 41. |[What is auto bootstrap process in AngularJS?](#q-what-is-auto-bootstrap-process-in-angularjs)|
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| 42. |[What is manual bootstrap process in AngularJS?](#q-what-is-manual-bootstrap-process-in-angularjs)|
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| 43. |[How AngularJS is compiled?](#q-how-angularjs-is-compiled)|
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| 44. |[What should be the maximum number of concurrent "watches"? How would you keep an eye on that number?](#q-what-should-be-the-maximum-number-of-concurrent-watches-how-would-you-keep-an-eye-on-that-number)|
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| 45. |[Where should we implement the DOM manipulation in AngularJS?](#q-where-should-we-implement-the-dom-manipulation-in-angularjs)|
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| 46. |[How `$digest` works?](#q-how-digest-works)|
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| 47. |[What is a digest cycle in AngularJS?](#q-what-is-a-digest-cycle-in-angularjs)|
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| 48. |[Explain how $scope.$apply() works?](#q-explain-how-scope-apply-works)|
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| 49. |[What makes the angular.copy() method so powerful?](#q-what-makes-the-angularcopy-method-so-powerful)|
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| 50. |[What is a singleton pattern and where we can find it in AngularJS?](#q-what-is-a-singleton-pattern-and-where-we-can-find-it-in-angularjs)|
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### 3. Directives
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|Sl.No| Questions |
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|-----|------------------------------------------------------------------------|
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| 01. |[What are directives in angularjs?](#q-what-are-directives-in-angularjs)|
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| 02. |[List some built-in directives](#q-list-some-built-in-directives)
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| 03. |[Explain difference between 'compile' and 'link' callbacks in directive definition](#q-explain-difference-between-compile-and-link-callbacks-in-directive-definition)
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| 04. |[List types of scopes directive can have?](#q-list-types-of-scopes-directive-can-have)|
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| 05. |[How Directives are compiled?](#q-how-directives-are-compiled)|
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| 06. |[What are the directives in angularJS?](#q-what-are-the-directives-in-angularjs)|
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| 07. |[What are different ways to invoke a directive?](#q-what-are-different-ways-to-invoke-a-directive)|
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| 08. |[What is the difference between ng-show/ng-hide and ng-if directives?](#q-what-is-the-difference-between-ng-show-ng-hide-and-ng-if-directives)|
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| 09. |[When creating a directive, it can be used in several different ways in the view. Which ways for using a directive do you know? How do you define the way your directive will be used?](#q-when-creating-a-directive-it-can-be-used-in-several-different-ways-in-the-view-which-ways-for-using-a-directive-do-you-know-how-do-you-define-the-way-your-directive-will-be-used)|
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| 10. |[When should you use an attribute Vs an element?](#q-when-should-you-use-an-attribute-vs-an-element)|
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| 11. |[What is the role of ng-app, ng-init and ng-model directives?](#q-what-is-the-role-of-ng-app-ng-init-and-ng-model-directives)|
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| 12. |[How would you programatically change or adapt the template of a directive before it is executed and transformed?](#q-how-would-you-programatically-change-or-adapt-the-template-of-a-directive-before-it-is-executed-and-transformed)|
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| 13. |[What is the Router directive that can be placed on elements to navigate to a new route?](#q-what-is-the-router-directive-that-can-be-placed-on-elements-to-navigate-to-a-new-route)|
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| 51. |[What are directives in angularjs?](#q-what-are-directives-in-angularjs)|
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| 52. |[List some built-in directives](#q-list-some-built-in-directives)
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| 53. |[Explain difference between 'compile' and 'link' callbacks in directive definition](#q-explain-difference-between-compile-and-link-callbacks-in-directive-definition)
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| 54. |[List types of scopes directive can have?](#q-list-types-of-scopes-directive-can-have)|
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| 55. |[How Directives are compiled?](#q-how-directives-are-compiled)|
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| 56. |[What are the directives in angularJS?](#q-what-are-the-directives-in-angularjs)|
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| 57. |[What are different ways to invoke a directive?](#q-what-are-different-ways-to-invoke-a-directive)|
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| 58. |[What is the difference between ng-show/ng-hide and ng-if directives?](#q-what-is-the-difference-between-ng-show-ng-hide-and-ng-if-directives)|
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| 59. |[When creating a directive, it can be used in several different ways in the view. Which ways for using a directive do you know? How do you define the way your directive will be used?](#q-when-creating-a-directive-it-can-be-used-in-several-different-ways-in-the-view-which-ways-for-using-a-directive-do-you-know-how-do-you-define-the-way-your-directive-will-be-used)|
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| 60. |[When should you use an attribute Vs an element?](#q-when-should-you-use-an-attribute-vs-an-element)|
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| 61. |[What is the role of ng-app, ng-init and ng-model directives?](#q-what-is-the-role-of-ng-app-ng-init-and-ng-model-directives)|
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| 62. |[How would you programatically change or adapt the template of a directive before it is executed and transformed?](#q-how-would-you-programatically-change-or-adapt-the-template-of-a-directive-before-it-is-executed-and-transformed)|
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| 63. |[What is the Router directive that can be placed on elements to navigate to a new route?](#q-what-is-the-router-directive-that-can-be-placed-on-elements-to-navigate-to-a-new-route)|
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### 4. Filters
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|Sl.No| Questions |
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|-----|------------------------------------------------------------------|
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| 01. |[What are Filters in AngularJS?](#q-what-are-filters-in-angularjs)|
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| 02. |[What are the basics steps to unit test an AngulatJS filter?](#q-what-are-the-basics-steps-to-unit-test-an-angulatjs-filter)|
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| 64. |[What are Filters in AngularJS?](#q-what-are-filters-in-angularjs)|
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| 65. |[What are the basics steps to unit test an AngulatJS filter?](#q-what-are-the-basics-steps-to-unit-test-an-angulatjs-filter)|
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### 5. Service
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|Sl.No| Questions |
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|-----|------------------------------------------------------------------------------------------------------|
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| 01. |[What is difference between services and factory?](#q-what-is-difference-between-services-and-factory)|
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| 02. |[How do you share data between controllers?](#q-how-do-you-share-data-between-controllers)|
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| 03. |[How would you make an Angular service return a promise? Write a code snippet as an example?](#q-how-would-you-make-an-angular-service-return-a-promise--write-a-code-snippet-as-an-example)|
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| 04. |[What is the role of services in AngularJS and name any services made available by default?](#q-what-is-the-role-of-services-in-angularjs-and-name-any-services-made-available-by-default)|
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| 05. |[What is an interceptor?](#q-what-is-an-interceptor)|
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| 06. |[What are common uses of an interceptor in AngularJS?](#q-what-are-common-uses-of-an-interceptor-in-angularjs)|
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| 07. |[How would you implement application-wide exception handling in your Angular app?](#q-how-would-you-implement-application-wide-exception-handling-in-your-angular-app)|
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| 08. |[In angular, what does the calls to the HTTP methods return?](#q-in-angular--what-does-the-calls-to-the-http-methods-return)|
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| 09. |[Using the Angular Http module to make a request, which method is used to listen for an emitted response?](#q-using-the-angular-http-module-to-make-a-request--which-method-is-used-to-listen-for-an-emitted-response)|
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| 10. |[An Angular class that used to create an instance that will be an argument to the request method of http is?](#q-an-angular-class-that-used-to-create-an-instance-that-will-be-an-argument-to-the-request-method-of-http-is)|
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| 66. |[What is difference between services and factory?](#q-what-is-difference-between-services-and-factory)|
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| 67. |[How do you share data between controllers?](#q-how-do-you-share-data-between-controllers)|
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| 68. |[How would you make an Angular service return a promise? Write a code snippet as an example?](#q-how-would-you-make-an-angular-service-return-a-promise--write-a-code-snippet-as-an-example)|
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| 69. |[What is the role of services in AngularJS and name any services made available by default?](#q-what-is-the-role-of-services-in-angularjs-and-name-any-services-made-available-by-default)|
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| 70. |[What is an interceptor?](#q-what-is-an-interceptor)|
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| 71. |[What are common uses of an interceptor in AngularJS?](#q-what-are-common-uses-of-an-interceptor-in-angularjs)|
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| 72. |[How would you implement application-wide exception handling in your Angular app?](#q-how-would-you-implement-application-wide-exception-handling-in-your-angular-app)|
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| 73. |[In angular, what does the calls to the HTTP methods return?](#q-in-angular--what-does-the-calls-to-the-http-methods-return)|
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| 74. |[Using the Angular Http module to make a request, which method is used to listen for an emitted response?](#q-using-the-angular-http-module-to-make-a-request--which-method-is-used-to-listen-for-an-emitted-response)|
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| 75. |[An Angular class that used to create an instance that will be an argument to the request method of http is?](#q-an-angular-class-that-used-to-create-an-instance-that-will-be-an-argument-to-the-request-method-of-http-is)|
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### 6. Miscellaneous
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|Sl.No| Questions |
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|-----|-------------------------------------------------------------------------------------------------------------|
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| 01. |[What is the best practice to build your application](#q-what-is-the-best-practice-to-build-your-application)|
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| 02. |[When it is necessary or whether it is necessary to use `$scope.$apply`](#q-when-it-is-necessary-or-whether-it-is-necessary-to-use---scope-apply)|
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| 03. |[A JSON Web Token consists of?](#q-a-json-web-token-consists-of)|
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| 04. |[A JWT should be signed with a secret called?](#q-a-jwt-should-be-signed-with-a-secret-called)|
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| 05. |[Having the JWT token, what is the format of the Authorization header looks like?](#q-having-the-jwt-token--what-is-the-format-of-the-authorization-header-looks-like)|
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| 76. |[What is the best practice to build your application](#q-what-is-the-best-practice-to-build-your-application)|
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| 77. |[When it is necessary or whether it is necessary to use `$scope.$apply`](#q-when-it-is-necessary-or-whether-it-is-necessary-to-use---scope-apply)|
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| 78. |[A JSON Web Token consists of?](#q-a-json-web-token-consists-of)|
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| 79. |[A JWT should be signed with a secret called?](#q-a-jwt-should-be-signed-with-a-secret-called)|
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| 80. |[Having the JWT token, what is the format of the Authorization header looks like?](#q-having-the-jwt-token--what-is-the-format-of-the-authorization-header-looks-like)|
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