Top 100 Angular Interview Questions and Answers in 2021

Are you preparing for an Angular interview? Do you have an Angular interview scheduled? Are you looking for the most frequently asked Angular Interview questions and answers? Then you are on the right article. We have listed down the most commonly asked Angular interview questions and answers. Make sure you go through the entire blog so that don’t miss any of the questions.

First, What is Angular? Angular is a web application framework developed by Google. It is a type script-based, open-source web application framework. Angular is a platform focused on building mobile desktop web applications.

Table of Contents

Top 100 Angular Interview Questions and Answers

1. Explain what you know about Angular?

Angular is a web platform and a framework designed for building single-page client Applications using HTML and typescript. Angular is written as a typescript. Angular implements its core and optional functionality as a set of typescript libraries that is imported into the apps.

2. Can you explain the Architecture of Angular?

Angular Interview Questions and Answers - Angular Architecture
By Google – https://angular.io/docs/dart/latest/guide/architecture.html,
CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=51329241

Angular is a framework enforced for building client-based applications in HTML. The Angular framework consists of various libraries. Where some of them are core, and some of them are optional.

The Angular architecture defines eight main building blocks, such as:

Modules: Angular has a root module called the App module, which provides the bootstrap mechanism and is responsible for launching it. And this App module contains many functional modules.

Components: Every Angular project has a component called root components, and this connects to the component hierarchy with a page DOM(Document Object Model). Here each component specifies a class that consists of the logic and application data, which is associated with the HTML template that defines the view to be displayed in the target app. Here the component controls the part of a screen called a view.

Templates: The Angular templates are defined to combine the HTML with the Angular markup that can be used to modify the HTML elements before being displayed. The template directives will provide you the program logic and binding markups that let you connect the application data with the DOM.

Metadata: The metadata in Angular tells how to process a class. Metadata decorate the class to configure the expected behavior of the class. We use metadata to a class to say the Angular app, that the app component is the component. Metadata is attached using decorator to the typescript.

Databinding: Data Binding in Angular communicates between the template and its components. It is also used to communicate between the parent and child components. Angular also allows us to define communication between a component and a DOM by making it an interactive application.

Directives: Directives are defined as the building blocks of Angular applications. Angular has many built-in directives.

Services: In Angular, we create a service class for data or logic that is not related to a specific view, and you want to share the data across components. Components and services are differentiated by Angular to increase reusability and modularity. 

Dependency Injection: Dependency injection in Angular keeps your component classes efficient. Dependency Injection delegates tasks to the services instead of fetching the server’s data and validating user inputs.

3. Can you explain the difference between Annotations and Decorators in Angular?

AnnotationsDecorators
The traceur compiler uses annotations.The typescript compiler uses decorators.
Attribute annotations are created to store the array.Decorators are defined as the functions that get the object which needs to be decorated.
Annotations are hardcoded.Decorators are not hardcoded.

4. What Is the Digest Cycle? Explain?

The digest cycle in Angular is defined as monitoring the watchlists to track the watch variable value of the watch variable. The digestive process is usually implicitly triggered, but there is also an option to activate it manually using the function $Apply().

5. Can you tell us which Is the Latest Version of Angular? What Are the New Features in It? 

Angular 8 is the latest version.

Some of the features in Angular eight are listed below:

  1. Angular 8 supports the typescript 3.4.
  2. Angular 8 has the differential loading for the application code.
  3. Angular eight is improved by payload size, compatibility. It has made easy debugging, faster rebuild time, etc.
  4. Angular 8 has a dynamic import for lazy routes.
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6. Explain the BootstrApping Module in Angular?

In Angular, the root module that is bootstrapped to launch the application is known as bootstrapping module. Every Angular application has this bootstrapping module. The bootstrapping module is also referred to as AppModule.

7. Name the Various Filters Supported by Angular?

The various filters supported by Angular are:

Filter nameSpecification or Description
UppercaseIt converts the string into an upper case.
LowercaseIt converts the string into a lower case.
DateIt converts the ‘date’ into the specified format.
OrderByIt orders an array by specific or defined expression.
NumberIt formats the number into a string.
CurrencyIt converts the number to the given currency format.
Limit toIt limits the array to the specified number.
JSONIt converts the format object into a JSON string.

8. Explain Wildcard Route?

Wildcard route in Angular is defined as the path that contains two asterisks (‘*’) that can match any given URL. It is useful when the given URL does not correspond with any of the predefined routes. We can make use of the wildcard route instead of throwing an error and define the specified component.

9. What is a component in Angular?

The component in Angular is defined as a logical piece of code.  The component contains 

  1. The template contains the HTML or the URL that has to be rendered.
  2. Class to define properties and methods which have to support the view.
  3. Metadata is defined using a decorator.

Angular Interview Questions and Answers

10. What are the Special Transition States in Angular?

Special transition states in Angular are Wildcard(*) and void. 

  1. Here the wildcard can match to any transition state.
  2. The void state here is used to configure transition for elements that are entering or leaving a page.

11. Name the Different Types of Compilations in Angular?

The two types of compilations in Angular are:

  1. AOT(Ahead-of-time)
  2. JIT(Just In Time)

12. Explain Package.json and its Purpose?

It is easy to manage the project dependencies using the JSON packages. Package.json allows us to specify details like version, language, etc. For example, when we use typescript in our project, we are allowed to mention the typescript and its version. 

Few examples are tsconfig.json, metadata.json, etc.

13. Explain the templates in Angular?

The Angular templates are an HTML view, where the binding controls can display the data to the Angular component properties. Templates can be defined using the property:

Template: <div>My sample1 Template</div> 

Templates can also be called from a different HTML file using the property @Component decorator’s URL property: templateUrl: ‘App/App.component.html.’

14. Can you explain what Angular CLI is? How Do You Use It?

Angular CLI is used to automate the end-to-end development process. With the Angular CLI, the application’s initialization, configuration, development becomes very easy and simple. With the Command Line Interface(CLI) help, we can create new projects, add new features, unit tests, and the end-to-end tests by typing a few commands. With the help of Angular CLI, both development and testing have become faster.

15. Can you tell us whether the Routing Module Mandatory for an Application?

According to the Angular route documentation, it is mandatory to use a route with the components.

16. Can you explain what Class Decorators are in Angular?

Class decorators in Angular consist of the metadata of the suitable class type. Class decorators appear before the class definition, and they declare the class to be of a specific type. Few examples of class decorators are @pipe, @component, @Injectable, @NgModule.

17. Can you explain what Directives are in Angular and Name the most commonly used directives in Angular?

Using Angular directives, the developers can write Application-specific custom HTML syntaxes. The new language is now written in the DOM. Whenever a new HTML syntax is found, the Angular compiler executes the directive functions.

We have four types of directives in Angular, namely.

  1. Attribute directive
  2. Component directive
  3. Structural directive.
  4. Custom directive

The most commonly used directives are listed below:

  1. ng-model
  2. ng-App
  3. ng-bind
  4. ng-repeat
  5. ng-show

18. Explain What Is a Pipe in Angular? Write a Simple Code to Demonstrate?

Pipe(|) in Angular is used to transform the input data into the desired given format.

Example <p>Cost is {{ Cost| currency }}</p> 

19.  Differentiate between Angular and Angular JS?

AngularAngular JS
Angular is an open-source typescript created by google.Angular JS is an open-source javascript to develop SPAs.
Front-end developers use an Angular framework to present and manipulate data efficiently.Web developers use it to design web Applications.
Angular uses components and directives in terms of architecture.It supports the Model view controller design.
Angular is written in Microsoft’s typescript language.AngularJS is written in Javascript.
It supports mobile browsers.It does not support mobile browsers.
It uses dependency injection. It does not use dependency injection.

20. Explain the differences between AOT and JIT?

AOTJIT
AOT stands for Ahead of time compilerJIT stands for Just In Time compiler
It generates a typescript.It generates Javascript. 
AOT compiles the App at build time on the server.JIT compiles the app in the browser at run time.
It is used in production mode.JIT is used in development mode.

Angular Interview Questions and Answers

21. List the differences between component and directive in Angular?

ComponentDirective
Components are able to access the data only within the scope.Directives can modify data that are out of scope.
We use @component annotation to register a component.@Directive annotation is used to register a directive.
Each of the DOM elements can specify only one component.We can have any number of directives in one DOM element.

22. Explain the AngularJS module?

An Angular JS module is used to define an Application, and it is a container for various parts of the application. It is also the container for the application controllers. The Angular JS module is a container for various parts of an application like controller, directives, service, filters, factories, etc.

23. Explain controllers in Angular?

Angular JS Applications rely on the controllers to control the flow of data in the application. In AngularJs, we define a controller by using the ng. Controller directive. A controller can be defined as a javascript object that consists of attributes, properties, and functions.

24.Can you explain the Features of Forms in Angular?

Applications use the forms to allow users to log in, enter sensitive data, update a user profile, and do many other data entry tasks. There are two ways to handle form data, i.e., user inputs, namely,  reactive and template driven. 

  1. Here both the approaches capture the user input events from the view.
  2. They both validate the user inputs,
  3. They both create a form and data model to update
  4. They provide a way to track the changes.

Reactive forms in Angular provide direct and explicit access to the given underlying Form Object Model. These reactive forms are more robust, scalable, reusable, and testable. Use reactive forms if your forms are a vital part of the application.

Template-driven forms in Angular are the forms that rely on template directives for creating and manipulating the underlying object model. Template-driven forms are helpful to add a simple form to an application like an email sign-up form. These forms are easy to add to an application, and they are not scalable as reactive forms. You can opt for template-driven forms when you have a fundamental form requirement, and the given logic can be maintained by templates solely.

25. Can you explain the lifecycle hooks?

Lifecycle hooks in Angular are defined as a set of processes that an Angular goes through from the start to the end.

ngOnChangesAngular calls this method when the value of data-bound property changes
ngOfInitThis method is invoked by Angular whenever a component or directive initialization takes place.
ngDoCheckThis method is called to detect and take actions that Angular doesn’t do on its own.
ngAfterContentInitThe Angular calls this method in response to the Angular projects, on an external content into the component’s view.
ngAfterContentCheckedThis method is called in response after the Angular checks on the content projected into the component.
ngAfterViewInitThis method is provoked in response to the Angular initializing the component’s views and child views.
ngAfterViewCheckedThis method is invoked in response to the Angular that checks the component’s view and child view.
ngOn DestroyThis is called by Angular to clean up after an Angular destroys a component or directive.

26. Can you tell us how Metadata Is Represented in Angular?

Metadata in Angular is represented using decorators such as 

  1. Class decorators
  2. Property decorators
  3. Method decorators
  4. Parameter decorators

27. Can you explain a few advantages of using Angular?

Some of the benefits of using Angular are listed below:

  1. It supports two-way data binding.
  2. It supports both template syntax and validations.
  3. It allows us to add custom animations, services, and directives.
  4. Angular provides a seamless event handling process.
  5. Angular provides client-server communications and restful services.
  6. It enforces a hierarchical dependency injection structure.

28.  Explain data binding in AngularJS?

Data binding in AngularJs is defined as the automatic synchronization of the data between the model and view components.

29. Name the types of data bindings in Angular? Explain?

There are four types of data bindings in Angular, namely,

  1. String Interpolation
  2. Property binding
  3. Event binding
  4. Two-way binding

30. Differentiate One-Way binding and Two-Way binding?

One-way bindingTwo- way binding
It is used to bind the data from the model to view.Two-way binding binds the data from the model to view and view to the model.
The data flow is unidirectional.Here the data flow is bidirectional.
Whenever the data is changed in the component, then the new value is updated in the view.Ng-model directive is used to create the two-way binding.

31. Why is an HTTP client important?

In Angular applications, HTTP client is a simplified version of HTTP API. HTTP client enables better error handling mechanisms, request and response interception, observable APIs, typed request, and response objects. 

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Angular Interview Questions and Answers

32. Can you please explain the different features of Angular?

The various features of Angular are listed below:

  1. Angular allows you to create accessible Applications by using ARIA-enabled components and developed guides.
  2. Angular support command-line interface tools. Which are used for adding components, instant deploying, testing, etc
  3. Angular uses its intuitive API, which allows you to create high-performance, complex animations with less code.
  4. Angular supports Cross-Platform App development. It can be used to build efficient, powerful desktop and progressive web pages.
  5. Angular can convert templates into high optimized code, which is used for modern javascript virtual machines.
  6. The Angular component router has the automatic code-splitting option so that only the required code is loaded.
  7. Angular has source code editors and IDEs that offer code completion, instant errors, etc.
  8. Angular has simple and powerful template designs that allow you to create UI.
  9. Angular has its way of testing frequently using karma.

33. Explain the MVVM architecture?

The MVVM architecture is designed in such a way that it removes tight coupling between the components. The architecture has mainly three parts.

  1. Model
  2. View
  3. View Model

 The model defines the data and business logic of an application. In simple terms, the model consists of the structure of an entity.

The view represents the visual layer of the application. It mainly consists of the UI code, it is responsible for sending the user’s actions to the ViewModel, and in turn, it does not receive any feedback from the view model.

The view model represents an application’s abstract layer, which acts as a connecting bridge between the view and the model. View and view models are interconnected with data binding. Hence if any modifications are made in the view, the view model notes down the changes and updates the model with new data.

34. Explain string interpolation in Angular?

String interpolation in Angular is referred to as a particular type of syntax, which uses template expressions to display the component data. The template expressions that are used are enclosed with {{}} (double curly braces).

Here, the javascript expressions that have to be executed by Angular should be added within the curly braces, and the output is embedded into HTML code.

35. Can you differentiate between Angular and Jquery?

AngularJQuery
Angular is typescript-based, and it is a front-end development framework.It is a Javascript-based library.
Angular is used to create single-page applications.JQuery is mainly used for DOM manipulations.
It suits large, complex projects.It is advisable for small-size projects.
It is comparatively complex.It is very simple and easy to learn,
It supports two-way binding.It supports one-way binding.

36. Explain view encapsulation, and in how many ways can we achieve it?

View encapsulation in Angular determines whether the defined styles in a specific component affect the entire application.

Angular supports three types of encapsulation, namely,

  1. Emulated: Here, the styles from the HTML communicate with the component. The styles that are defined in the component’s @component decorator are scoped to this specified component only.
  2. Native: Here, the styles from the HTML do not communicate with the component.
  3. None: Here, the styles from the component communicate back to the HTML, and hence they are visible to all the components of the page. 

37. Can you explain why Angular was introduced as a client-side framework?

To develop dynamic websites, traditional VanillaJS and JQuery were used by the developers. It was difficult for the programmers to maintain such code, as the website used to become more complex with added functionalities and features. There was no means of data handling across the views by Jquery.

To address these issues, Angular was built, making it easy for the developers by dividing the code into small pieces of information called components in Angular. The client-side framework allows the development of the most advanced web applications such as SAP.

38. Can you explain dependency injection in Angular?

Dependency injection in Angular is an application design pattern, and it forms the core concepts of Angular. Dependencies in Angular can be defined as services that have specific functionality. The different components and directives in Angular may need these functionalities of the service. Here Angular provides a smooth process in which the dependencies are injected into the directives and components.

39. Explain the advantages of AOT compilations?

An Angular application has to be compiled before running inside the browser because the Angular application contains specific components and templates that a browser cannot understand. The Angular compiler takes the JS code, and it compiles and produces some JS code known as AOT compilation. This happens for every application per user per occasion.

Few advantages of AOT compilation are listed below:

  1. Fast rendering: The browser loads in the executable code and displays it immediately as and when the application is compiled before running in the browser.
  2. It has fewer Ajax requests: Here, the compiler eliminates the AJAX requests for the source file by sending the external HTML and CSS file along with the application.
  3. It minimizes the errors: It makes it easy to detect and handle the errors during the building phase.
  4. It enforces better security: The AOT compiler adds the HTML and templates into the JS file before the Application run inside the browser. As a result, there is no additional HTML file to be read. Hence it provides better security to the application.

40. Could you please explain the difference between Angular expressions and JavaScript expressions?

Angular script expressionsJavaScript expressions
Angular expressions are valued against scope objects.Javascript expressions are valued against the global window.
Here the expressions evaluations are forgiving null and undefined.The expressions here try to evaluate the undefined properties and generate errors.
Control flow statements like loops are not allowed in this expression.Control flow statements like loops can be used with javascript expressions.
They do not allow function declaration.JavaScript expressions allow function declarations.
Here, you cannot use bitwise or void operators.JavaScript expressions can make use of bitwise or void operators.
The Angular expressions can work with the filters.The JavaScript expressions cannot work with filters. 
Angular script expressions allow one-time binding.Here, the JavaScript expressions do not allow one-time binding.

Angular Interview Questions and Answers

41. Can you state some advantages of Angular over other frameworks?

A few of the advantages of Angular over other frameworks are listed below:

MVC Architecture: MVC architecture sets the foundation for features like data binding and scopes. The architecture attaches value to the framework while creating the client-side apps. The MVC architecture has made it possible to isolate the App’s logic from the UI interface, supporting the separation of concerns.

Modules: Angular includes modules, which is a process of grouping directives, pipes, components, and complimentary services, and they can be combined with other modules to create an application. 

Services and Dependency injection:  Angular has dependency injection, a design pattern used to fulfill the dependencies. It divides the task among various services. The Angular injector creates service instances, and it injects them into components and services.

Custom Directives: In Angular custom, directives improve the HTML functionality, which suits the dynamic client Application. Some of them are ngModel, ngClass, ngStyle.

Typescript: Angular is written in typescript, which is a superset of javascript. The code is compiled to javascript and eliminates the common mistakes while coding. 

42. Explain the features for Angular 6 over Angular 5?

The following are the features of Angular 6 over Angular 5:

Angular elements: The Angular elements package in Angular 6 allows us to create an Angular element and publish it as a web component that is later used in the HTML page. It is a good choice for developing single-page applications.

Ivy Renderer: Ivy focuses on speed improvements, size reduction, and it increases flexibility by reducing the App’s size and makes the compilation faster. This vital feature reduces the code size by gzipping the code.

Closure Compiler: It is used to create Javascript modules for google web Applications. It generates smaller bundles and eliminates dead code.

Component Dev Kit: It has a component dev kit that comprises more than 30+ UI components. The CDK allows us to create our own library of UI components by making use of  Angular Material. It eliminates the libraries like Flex layout, learning CSS grid by supporting responsive web design layouts.

Service Worker: The script that runs in the web browser and manages to cache for each Application.

Ng Add: The ngAdd command in the Angular CLI lets you download and install new packages.

Ng Update: The Angular team adds this one to let the users update from Angular 5 to Angular 6.

There are three steps to be followed by the update:

  1. Update @Angular/CLI
  2. Update your Angular framework packages
  3. Update other dependencies

Animation Performance Improvements: The Angular6  is updated with new animation performance improvements. There is no need for web animation polyfill.

Tree shaking: They have moved the module referencing services to the service referencing modules, making the App smaller.

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43. Can you explain how AngularJS routes work?

The routes in AngularJS enable the developer to create different URLs for different contents in the Application. Now the different URLs for the different available content allow us to bookmark URLs specific to each content. The bookmarkable URLs in AngularJS are known as routes.

44. Can you explain the steps for the compilation process of HTML?

The compilation of the HTML occur as listed below:

  1. The HTML is parsed into DOM by using standard browser API.
  2. Next, the $compile() method is called for the compilation of the DOM. This method travels through the DOM and matches the specific directives.
  3. Next, you have to link the template with a scope by calling the specific linking function that was returned in the previous step.

45. Can you explain the linking function and its types in Angular?

The link function in Angular deals with combining the DOM scope, and the link function is responsible for registering the DOM listeners and updating the DOM. We have two types of linking functions, namely pre-linking and post-linking functions.

  1. Pre-linking Function: This function is executed before the child elements are linked. This function is not a safe way for DOM transformations.
  2. Post-Linking Function: This function is executed after the child elements are linked. It is considered a safe way to do DOM transformation.

46. Can you differentiate between link and compile in AngularJS?

LinkCompile
Link is used for registering DOM listeners.Compile function is mostly used for template DOM manipulation.
It combines the directives within the scope and produces a live view.It traverses the DOM and collects all the directives.

47. Explain the characteristics of scope?

The characteristics of scope are as follows:

  1. Scope provides APIs to observe the model mutations.
  2. The scope is used to propagate any model changes through the system into the view.
  3. A scope can inherit properties from its parent scope. Scopes can be nested to isolate the Application components in Angular.
  4. Scope gives the context against which the expressions are evaluated.

48. Explain the factory function in AngularJS?

Factory method in AngularJS is used to create directives. The factory function is invoked or called only when the compiler matches the directive. You can use $injector. Invoke to call the factory method.

49. Can you name the person who created the AngularJS?

Adam Abrons and Misko Hevery developed AngularJS. 

50. Can you explain the styling Form that ngModel adds to the CSS classes?

NgModel adds the following to the CSS classes to allow Form styling.

  1. ng-valid.
  2. ng-Invalid 
  3. ng-pristine
  4. ng-dirty

51. Can you explain the differences between Angular.JS and Backbone.js?

Angular.jsBackbone.js
It is a framework.It is a lightweight, easy-to-use library.
It can be a UI system in JS based on the typescript.Based on the MVC model, it can be a UI system in JS.
It creates dynamic web pages.It gives custom occasion functionalities to the web pages.
Google maintains it.Backbone.js is licensed under MIT.

52. Explain order-by filter in AngularJS?

Order-by filter orders the arrays based on specific criteria. 

The below example states how to to use order by

<ul>
<li ng-repeat = "company in product.products | orderBy:cost">
      {{ company.product + ',cost:' + product.cost }}
   </li>
</ul>

53.Can you explain the uses of double-click events in AngularJS?

A double-click event lets the user specify custom behaviors by double-clicking the mouse on a web page.

54. Explain ng-non-bindable in AngularJS?

Ng-non-bindable specifies the AngularJS not to compile the HTML element and its corresponding child nodes. For example:

<title ng-non-bindable > </title>

55. Can you explain ng-click directives in Angular with an example?

Ng-click directives in Angular are used in scenarios like when you want to click on the button to perform an operation.

Example:

<button ng-click="count = count ++">Click</button>

56. Can you explain the use of $routeProvider?

$routeProvider in Angular sets the URL configuration, and It is used to map the related ng-template or HTML page, and it attaches the controller with the same.

57. Why do we use ng-include in AngularJs?

Ng-include helps us to embed all the HTML pages within a single HTML page.

For Example:

<div ng-App = "" ng-controller = "interview Controller">
   <div ng-include = "'first.htm'"></div>
   <div ng-include = "'phases.htm'"></div>
</div>

58. Name the common Angular Global API functions?

Some of the commonly used Global API functions are listed below:

  1. Angular.isString: This function will return true only if the given reference is of type string.
  2. Angular.lowercase: It is used to convert any string to lowercase
  3. Angular. Uppercase: It is used to convert any string to uppercase.
  4. Angular.isNumber: This function returns true only if the reference is a numeric value or number.

59. Can you explain how you can set, get, and clear cookies in Angular?

We use the following methods to set, get and clear cookies in Angular:

  1. $cookies. put() method is used to set the cookies.
  2. $cookies. get() method is used to get the cookies.
  3. $cookies. Remove method is used to remove cookies in Angular.

60. Can you name a few Angular components that can be injected as dependencies?

The Angular components that can be injected as dependencies are:

  1. Value.
  2. Factory.
  3. Service.
  4. Provider.
  5. Constant.

61. Explain Browser Object Model(BOM)?

Browser Object Model in Angular contains history, screen location, object navigator, etc. It is used to describe the global browser objects like a window, local storage, and console.

62.  Can you explain $routeScope in AngularJs?

The $rootScope is created on the Document Object Model Element.  The Application usually has only one $rootScope that is shared with other components. $routeScope can watch expressions, and also, it can propagate. events.$routeScope has an ng-App directive.

63. Can you explain how to make an Ajax call using AngularJs?

AngularJS offers the $https: control, which will help to make ajax calls to read the server data. In AngularJs, to get the specified records, the server makes a database call. If your data in JSON format is ready, you can use $https to fetch the server’s data.

64. Can you name the different scopes of the AngularJs scope lifecycle?

The different scopes of the AngularJs scope lifecycle are listed below:

  1. Creation.
  2. Model Mutation.
  3. Watcher Registration.
  4. Mutation Observation.
  5. Scope destruction.

65. Explain NPM?

NPM, i.e., Node Package Manager, consists of a command-line tool client to interact with the Node.js project of the repository.

66. Write the syntax of the factory method in `Angular?

The syntax for the factory method is as follows:

App.factory(‘serviceName’,function(){ return serviceObj;})

67. Can you explain the concept of webpack?

Webpack in Angular is a module bundler. It is used to bundle, transpilers, and minify Angular Applications.

68. Can you explain how to create a new project in Angular using the command line interface?

You need to run the ng-new project name command in the Angular command-line interface to create a new project.

69. Explain the service method in Angular?

The service methods help you to define the services and the ways to do it.

70. Explain immediately invoked function expression?

Immediately Invoked Function Expression in Angular is a function that is executed as soon as it is created. This function offers a way to isolate the variable declaration. The IIFE functions contain two major functions, namely,

  1. operator()
  2. expression()

71. Explain a single-page Application in AngularJs?

A single page Application in Angular is a web application or web page that interacts with the users dynamically. Few examples of single pages in Angular are javascript, HTML, and CSS. The SPA can perform navigation without refreshing the whole HTML page.

72. What is ngZone In Angular?

The ngZone can be defined as a javascript wrapper class that is denoted by zone.js. It is used to allow developers to run code explicitly outside Angular’s zone, which in turn inhibits Angular from running any change detection.

73. Explain Authentication In Angular?

Authentication in Angular is a service used for login and logout of the Angular Application. The credentials of the users are passed to the servers API. After the post-server side validations of the credentials, a JSON web token is returned, giving details about the current user.

74. What are the basic requirements to work with AngularJS?

First, you need to download the latest version of the AngularJS from the website AngularJS.com.You need a JS file to host it locally. You can also make use of Google CDN for reference.

75. Can we create Nested controllers in Angular?

Yes, we can create nested controllers in Angular.

76. How do you convert a string into currency in Angular?

We can convert the given string input into currency type by using a currency filter in Angular.

77. Can you explain ECMAScript?

European Company Manufacturer’s Association is a standard scripting language. The Javascript Web makes use of ECMAScript as its core language. Developers make use of it to write client-side scripting on the W.W.W (World Wide Web) or server applications and services. Features like prototype, functional, dynamic, and structured features are included in ECMAScript.

78. Explain Traceur compiler?

Traceur is defined as a javascript compiler that makes use of classes, generators, and other features from ECMAScript.

79. Explain routing in Angular?

Routing in Angular is a method that merges various views. The controller makes the decision to combine the views depending on the logic.

80. What are parametrized pipes in AngularJS?

The pipes can have more than one parameter in AngularJs to tune the fine output. A parameterized pipe in Angular is created by declaring the pipe with a colon(:). The colon(:) is used to separate multiple parameter values.

81. Can you name the DSL animation functions in AngularJS?

The DSL animation functions in AngularJS are listed below:

  1. group()
  2. state()
  3. transition()
  4. keyframes()
  5. triggers()
  6. styles()
  7. sequence()
  8. animate()

82. Name the essential parts of AngularJs metadata?

The essential parts of AngularJs metadata are:

  1. Class decorator
  2. Method decorator
  3. Parameter decorator
  4. Property decorator

83. Explain isolated unit tests?

Isolated unit tests in Angular are processes to check the class instance without using Angular dependencies or injected values. These isolated unit tests help us to implement the program very easily.

84. Explain transclusion in AngularJs?

The transclusion allows the developers to reallocate an original directive child into a specified location inside a template. Ng-transclude-slot or ng-transclude directives are used for transclusion.

85. What are the use cases of Angular? Explain?

  1. Progressive Web Apps(PWAs)
  2. Single-page Applications(SPAs)
  3. Multi-page Applications(MPAs)
  4. Desktop installed Applications for Mac, Windows, and Linux.

86. Can you explain how to create a decorator in Angular?

Function sample(target)
sample.log(‘ This decorator is for sample purpose,’ target);

The above piece of code creates a decorator called sample in Angular.

87. Explain how to create a class in Angular 7 with the help of CLI?

ng generate class sample [options]

The above code is used to create a class called sample in Angular 7.

88. Can you describe the main features of Angular 7?

  1. CLI prompts
  2. Angular Material and Development kit (CDK)
  3. The drag and drop module feature in Angular 7 lets us create easy drag and drop interfaces.
  4. The virtual scrolling in Angular 7 loads and unloads the items from the DOM that depend on the visible parts of the list, and thus it makes a fast user experience having a vast scrollable list.
  5. Application Performance Improvements.
  6. Documentation updates.

89. List the various versions of Angular?

The various versions of Angular are listed below:

  1. Angular version 1.0
  2. Angular version 2.0
  3. Angular version 4.0
  4. Angular version 5.0
  5. Angular version 6.0
  6. Angular version 7.0
  7. Angular version 8.0
  8. Angular version 9.0
  9. Angular version 10.0
  10. Angular version 11.0

90. Can you explain Ivy’s compiler?

The Ivy compiler in Angular is the next-generation compilation and rendering pipeline. It is Angular’s new feature that was introduced in Angular 9 that replaced the view engine.

91. What are the benefits of an Ivy compiler?

The benefits of the Ivy compiler are as follows:

  1. It has a smaller bundle size.
  2. It has enhanced CSS classes.
  3. It has simplified type checking.
  4. Ivy compiler has improved the style binding.
  5. It has reduced the build times and has increased the compiler’s performance.

92. Explain any three new features of Angular 9?

The features of Angular 9 are listed below:

  1. Typescript 3.8 support is added to Angular 9.
  2. It has enhanced highlighting of the HTML and expression syntax.
  3. In Angular 9, the use of TSLint 6.1 is made default.

93. Can you define observables in Angular?

The observables in Angular pass messages between various application parts. They are responsible for handling numerous asynchronous operations like:

  1. They define the custom events by transmitting the output data from the child to the root component.
  2. They respond to different user input events.
  3. Observables handle multiple AJAX requests and responses.

94. Explain any three new features in Angular 10?

The features of Angular 10 are:

  1. The typescript 3.9 support is added to Angular 10.
  2. The computation of base paths is made lazy to boost the performance.
  3. The Angular10 has increased the performance of type-checking.

95. What are the promises in Angular?

Promises in Angular provide a way to execute the asynchronous functions in a series by registering a promise object.

96. Explain the term annotation in Angular?

Annotations in Angular are used for creating the attribute annotations, which in turn stores an array.

97. How many types of templates are there in Angular?

There are two types of templates in Angular, namely.

  1. Static template.
  2. Dynamic template.

98. Explain the term property binding in Angular?

The property binding helps you to set specific values for the properties of the HTML elements or directives. With property binding, you can share values with different components, and you can set paths programmatically.

99. Explain two-way binding in Angular? 

Two-way binding in Angular is a combination of property binding and event binding. It is a mechanism where it combines the input and output binding as a single notation by using the ngModel directive.

100. What is Angular 7?

Angular7 is defined as an open-source javascript framework used for developing web applications and apps in HTML, typescript, and Javascript. It has built-in features for animations, HTTP services.

Best of luck with your Angular Interview and we hope our Angular Interview Questions and Answers were of some help to you. If you are looking for a job in the MicroStrategy area, then you can check out our MicroStrategy Interview Questions.

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