RnewYear2022 RnewYear2022

- Java Blogs -

Top 105 Angular Interview Questions and Answers In 2023

Introduction

There’s no doubt that Angular is a highly desired skill in the software engineering world. With this knowledge, you can land your dream job as well as increase your earnings potential. Moreover, it also helps you stay ahead of the competition. 

There are multiple ways to become an expert in Angular and one of them is by getting ready for your interview with the right Java Training Program. You will master the fundamentals and gain skills that will help you become industry ready and ace your upcoming interview.

Let us check out the top 35 Angular Interview Questions and Answers that will help you crack your next Angular interview.

Cyber Security Training & Certification

  • Detailed Coverage
  • Best-in-class Content
  • Prepared by Industry leaders
  • Latest Technology Covered

Angular Interview Questions and Answers For Freshers

Q1. What do you understand about Angular?

Ans:- This framework offers exceptional scalability and maintainability as well as structure and consistency to online applications. Single Page apps are made using Angular. 

It is an open-source JavaScript framework entirely developed in TypeScript. It expresses the components of your program using the syntax of HTML.

Q2. What technologies are used in Angular?

Ans:-  Angular uses TypeScript which is a superscript of JavaScript. So, any valid JavaScript is a valid TypeScript. TypeScript enables us to write JavaScript as a strongly typed language and gives us the ability to create our own types, making it much simpler to find issues. It also makes use of RxJS, which enables programmers to handle asynchronous processes more effectively.

Do you know what is Exception Handling In Java? Check out our guide on Types of Exception Handling and understand why they are used in Java.

Q3. What is the difference between Angular and Angular JS?

Ans:- The difference between Angular and AngularJS can be summarized as follows:

If you're looking to get started with a web development framework, Angular is the way to go. It's the latest and greatest from Google and will help you create fast, responsive, and modern web applications.

Q4.  What is Data Binding?

Ans:-  Data binding is used in websites with interactive features like games, calculators, calculator forms, tutorials, and tutorials. Data binding is practical when pages have a large amount of information and are shown incrementally.

In Angular, two-way binding is used. The matching model state reflects any changes made to the user interface. On the other hand, any changes to the model state are also reflected in the UI state. This enables the framework to use the controller to link the DOM to the Model data.

Q5.  What are single-page applications?

Ans:- Web apps known as single-page applications only load once and only add new functionality to the user interface. The content of the new page is produced dynamically rather than loading new HTML pages. JavaScript's ability to work with the DOM components on the current page itself makes this possible. A SPA technique offers a seamless user experience since it is faster.

Tip: Preparing for your next Angular interview? Check out our top 75 Angular JS Interview Questions and Answers.

Q6. What are decorators in Angular?

Ans:- Decorators are functions or design patterns that specify how Angular features operate. Prior changes to a class, service or filter are made using them. There are 4 types of decorators namely:

  • Class Decorators
  • Property Decorators
  • Method Decorators
  • Parameter Decorators

Q7. What are String Interpolations?

Ans:-  The moustache syntax, commonly known as string interpolation, in Angular only permits one-way data binding. Double curly braces are used in a particular syntax for this purpose so that the component data can be shown. The JavaScript expressions that Angular must run to acquire the result are included within the braces and then can be put into the HTML code.

Q8.  How can you distinguish between Decorators and Annotations in Angular?

Ans:-  Decorators in Angular are design patterns that assist in modifying or beautifying the relevant classes without altering the real source code.

On the other side, Angular uses annotations to create an annotation array. They are a set of metadata for the specified class and make use of the Reflective Metadata library.

Learn & Grow with our popular Angular Community, and gain Angular skills and hands-on experience.

Q9. What are templates in Angular?

Ans:-  HTML is used to create Angular Templates. This HTML includes Angular-specific elements and attributes. These templates are further rendered in conjunction with the data from the model and controller to provide the user with a dynamic view.

Q10. What is the use of Directives in Angular?

Ans:- Using directives, users can create new HTML syntax that is customized to their applications. When the Angular compiler locates them in the DOM, they are executed. The three types of directives that Angular provides.

  • Component
  • Structural
  • Attribute

Q11. What do you understand by AOT Compilation in Angular?

Ans:-  Angular's AOT (ahead-of-time) compiler significantly accelerated the rendering process. This transforms Angular HTML and TypeScript code into JavaScript during the development phase. The compilation procedure is required due to the usage of TypeScript and HTML code by Angular. The compiler then transforms the code into JavaScript so that the browser running our application can make use of it.

Learning JavaScript can turn out to be the best decision for an IT professional. Check out our blog on how to learn javascript and take your web development career to the next level.

Q12. Define Components in Angular.

Ans:-  The fundamental building blocks of the user interface in an Angular application are the components. Each component has a template and is a subset of the directives. An Angular application generally consists of an AppComponent as the root component at the top of a hierarchy of additional components.

Q13. What is the use of modules in Angular?

Ans:- A logical boundary of our application is a module. Code dealing with a specific aspect of the program, such as routing, HTTP, validation, etc., is contained within it. The primary goal of using modules is to improve application composability.

Q14. What is the function of DOM in Angular?

Ans:- Document Object Model or DOM is responsible for expressing changes in an application's architecture as well as the content of a web page. The document can only be readily edited, altered, and accessed with the help of APIs in this case since all the objects are arranged in the shape of a tree.

Q15. What do you understand by Pure Pipes in Angular?

Ans:- These are pipelines that use just pure functions. Due to this, a pure pipe uses no internal state and maintains the same output as long as the parameters given do not change. Angular calls the pipe, only when it notices a change in the parameters being given. Throughout all components, a single instance of the pure pipe is utilized.

Q16. Define Services in Angular

Ans:-  In Angular, the word "service" refers to a broad category of functionality. Any benefit, feature, or capability that an app requires is a service. A service is often used to carry out a very specific task, such as HTTP communication, data transmission to a cloud service, text decoding, data validation, etc. Service just does one task but does it well.

Q17.  What are ngModules?

Ans:- ngModules are containers that assign a section of code to a workflow or an application domain. The metadata item that ngModule accepts typically explains how to create an injector at runtime and build the component template. Additionally, it uses the export property to identify the module's parts, directives, and pipes, making some of them accessible to external components.

Q18. What are the advantages of AOT?

Ans:- The advantages of AOT are as follows:

  • Since the browser will get a pre-compiled version of the application after compilation, it is not necessary to build the app before rendering it.
  • It incorporates external HTML templates and CSS style sheets directly into the JavaScript of the application, reducing the need for several Ajax queries.
  • The compiler will minify the code, to reduce the download size, 
  • Any errors in the templates will be reported by the compiler during the compilation stage so that they can be fixed before production.

Q19. What are lifecycle hooks in Angular?

Ans:-  When developing an Angular application, there will be instances when we need to run some code in response to a certain event, such as when a component is initialized, displayed, or removed from the screen. Lifecycle hooks are used for this purpose.

We can override some component methods, such ngOnInit or ngAfterViewInit, to use a lifecycle hook. If these methods are accessible on a component, Angular will automatically call them. This is the reason why they are called lifecycle hooks.

Are you heading on to your next Java Interview? Ace your upcoming Java Interview with confidence by preparing our Top 85+ Core Java Interview Questions and Answers.

Q20. Define Filters in Angular.

Ans:-  An expression is formatted and presented to the user using filters. They can be utilized in services, controllers, and view templates.

Q21. What do you understand by view encapsulation in Angular?

Ans:-  The view encapsulation specifies whether or not the template and styles set within the component can have an impact on the entire application.

Angular provides 3 view encapsulation strategies in Angular:

  • Emulated
  • Native
  • None

Q22. What is the use of controllers in Angular?

Ans:-  AngularJS controllers manage the data in AngularJS applications. They are typical JavaScript objects. The application controller is defined via the ng-controller directive.

Q23. What does "scope" in the context of Angular mean?

Ans:-  A scope is an object with accessible methods and attributes. The HTML,  view, JavaScript and controller are connected through the scope of Angular. Both the view and the controller have access to the scope. The $scope object is given as a parameter when creating a controller in Angular.

Q24. What is metadata?

Ans:-  In order to instruct Angular on how to handle a class, we need metadata. A component behaves as a class when it is used until we explicitly inform Angular that it is a component, which we do with the aid of metadata. Using a decorator, TypeScript attaches metadata. 

Q25. How is hierarchical dependency formed?

Ans:-  Hierarchical dependency injection is used by Angular. It comprises an injector tree that is parallel to the component tree of the application. The combinations result in the formation of the Dependency Hierarchy. Any level of the component tree can be used to reconfigure the injectors. The providers for various injectors could also be specified, In the injector hierarchy.

Q26.  What are the options to choose between inline and external templates?

Ans:-  Inline templates are often used for shortcodes and external templates for somewhat large views. But occasionally, company policy, circumstances, etc., determine whether to use inline or external templates.

Q27. What is the purpose of ngFor directive?

Ans:- The ngFor directive is used whenever it is necessary to repeat a section or sections of an HTML template once for each item in a collection.  It uses the ngFor directive to construct a template for each iteration as it gets simpler.

Q28.  What is the purpose of nglf directive?

Ans:-  The ngIf directive's goal is to destroy or reconstruct a section of the DOM tree in accordance with an expression. The element is removed from the tree if the ngIf directive determines that the expression is evaluated to be false; else, a matching element is added to the DOM tree.

Q29. What occurs if a script tag is used within the template?

Ans:-  When a script tag is used inside a template, Angular flags the value as unsafe and starts the sanitization process on its own. This eliminates the script tag while protecting the text element's content. The possibility of injection attacks is eliminated as a result of the entire procedure.

Q30. What do you understand by template expressions?

Ans:-  An expression that generates a value and is enclosed in double curly brackets is known as a template expression in Angular. Angular executes the template expression and applies it to a binding target property. The binding target can be any of these—an HTML element, a directive, or even a component.

Q31. What do you understand by template statements?

Ans:- Template statements in Angular refer to the operations or elements that are utilized in HTML in response to user events. Through activities like the presentation of dynamic information or the completion of forms, these template statements enable your application to engage users.

Q32. What is the use of async pipe?

Ans:-  The async pipe simply serves the goal of marking the components that need to be checked for changes. It returns the most recent value it has emitted and subscribes to an Observable or Promise. The components are identified by the async pipe after this new value has been emitted.

Q33. What makes Angular so popular?

Ans:-  Angular is easy to learn and use, which makes it attractive to developers who want to create engaging applications. Additionally, Angular has a strong community of developers who are actively contributing to its codebase and sharing their knowledge with others.

Q34. What are the benefits of Angular?

Ans:-  The benefits are many, but the most important ones are:

  • It has a lot of features. In fact, it's hard to find an area where Angular does not deliver.
  • It's easy to learn. If you have any knowledge of HTML or CSS, then you can easily use this framework.
  • The code base is large and well organized, so it's easy to find what you need in the project.

Q35. What is the difference between Angular and React?

Ans:-  Angular is developed by Google while React is developed by Facebook. Both are very similar in nature, but they have different approaches to development. Angular was built to address some of the shortcomings of other JavaScript frameworks like jQuery or Dojo. It was developed with the goal of making it easier for developers to build complex apps using HTML, CSS, and JavaScript.

Q36. Differentiate between one-way data binding and two-way data binding in Angular?

Ans:-  Changes in the state have an impact on the view from the component to the view template in one-way data binding. On the other hand, it's also feasible that a view's transformation from view template to a component will have an impact on the state.

With regard to two-way data binding, modifications made to the view can result in model modifications. In a similar vein, any model modifications might convert the view from a component to a view template.

Q37. What do you understand by parameterized pipes?

Ans:-  Before the data is finally displayed to the end users, Angular uses pipes to convert the raw data into the necessary format. In general, there are two types of these pipes:

  • Internal Pipes
  • Customized Pipes

The two forms of built-in pipes are parameterized pipes and chaining pipes.

Pipes that contain parameters are referred to as parameterized pipes. With the inclusion of a colon (:) in the command, we may utilize these pipes to pass an unlimited amount of arguments.

Q38. What do you understand by a custom element in Angular?

Ans:- You can design a tag whose content is generated and managed by JavaScript code using a custom element to expand HTML.

Q39. Do I need to use custom Bootstrap elements?

Ans:- The answer is no, you don't need to bootstrap custom elements because they do so when they are introduced to the DOM. Additionally, Angular's custom elements are automatically destroyed when they are removed from the DOM.

Q40. How are typings for custom items defined?

Ans:-  NgElement and WithProperties exported from @angular/elements can be used to provide typings for custom elements in Angular. A simple container with an input attribute is the following component:

@Component(…)

class MyDialog {

@Input() content: string;

}

Q41. How do custom elements work internally?

Ans:-  Let's break down the internal operation of custom components step by step:

  • Registration of the custom elements
  • DOM modification to include the custom element
  • Browser creates a class based on a component
  • Data binding and change detection 

Q42. What are the Angular component and custom element mapping standards?

Ans:-  The following list contains the key mapping rules between an Angular component and a custom element:

Using the createCustomElement() API, the component input properties are processed with the appropriate characteristics for the custom element.

The outputs from components are sent as HTML Custom Events with names that are identical to the output names.

Q43. How are pipes chained?

Ans:-  The following example shows the syntax that Angular uses to link pipes:

It is now [date:'fullDate' | uppercase] today.

Q44. What does a custom pipe mean?

Ans:-  You can design unique pipelines in Angular. In Angular, they were once referred to as "Filters," however they are really just specialized pipelines. The following is a typical definition of a custom pipe:

import { Pipe, PipeTransform } from '@angular/core';  

@Pipe({name: 'Pipename'}) 

export class Pipeclass implements PipeTransform { 

   transform(parameters): returntype { } 

}

Q45. State an example of a custom Pipe?

Ans:-  Check out the example below where we declared a custom pipe to round a number to its square in the Angular application. Please note that the command ng generate pipe is being used to build this custom pipe.

// Output

CREATE src/app/square.pipe.spec.ts (187 bytes)

CREATE src/app/square.pipe.ts (217 bytes)

UPDATE src/app/app.module.ts (2931 bytes)

Q46. What do you understand by a bootstrapping module?

The "Bootstrapping Module" in Angular is the root module used to launch or bootstrap the application. Every Angular project contains a Bootstrapping Module, which is kept in the AppModule class. In fact, the AppModule is another name for the Bootstrapping module.

Q47. How to read a full response?

Ans:-  The following code has to be used in Angular to read the entire response:

getUserResponse(): Observable {

  return this.http.get(

    this.userUrl, { observe: 'response' });

}

Q48. How is error handling done?

Ans:-  Error management in Angular can be done by creating a function that uses RxJS's catchError and HttpClient's catchError. The HttpClient in Angular parses JSON responses and provides a JavaScript object in the observable to handle problems.

Q49. What is content projection?

Ans:-  The term "Content projection" in the context of Angular refers to a pattern in which you can project the content you wish to utilize within another component. Consider a Card component, for instance, which can take content from another component.

Q50. What are the drawbacks of Angular usage?

Ans:-  Although utilizing Angular has a lot of advantages, there are some drawbacks as well. These are what they are:

On an Angular application, getting decent SEO results can be challenging and may require some setup.

Even though Angular has so many features, it can be challenging to get to know them all and figure out how to use them well together.

Using Angular for smaller projects can be quite inefficient and may dramatically increase the load size since it can add a large amount of weight to your JavaScript bundle.

Let us discuss the top Angular Interview Questions and Answers for experienced professionals.

Cyber Security Training & Certification

  • No cost for a Demo Class
  • Industry Expert as your Trainer
  • Available as per your schedule
  • Customer Support Available

Angular Interview Questions and Answers For Experienced Professionals

Q51. Explain the difference between AOT and JIT.

Ans:- Ahead of Time (AOT) compilation transforms your code during the build phase, before the browser downloads and executes it. This ensures quicker rendering for the browser.

The Just-in-Time (JIT) compilation technique converts computer code to machine code while the program is running, or at run time. When you use the ng build or ng serve CLI commands, JIT compilation is used by default. It is also known as Dynamic compilation.

Q52. Explain the role of observables in Angular.

Ans:-  Using an observer, we can conduct asynchronous activities declaratively. Observables are conceptualized as data streams that are sent from a publisher to a subscriber. As both deal with responding to asynchronous requests, they are comparable to promises.

Many developers choose observables because they provide them the ability to conduct a variety of actions, including the ability to combine two observables, map one observable into another, and even pipe numerous operations through an observable to change its data.

Angular 5, React JS & Vue are the top Angular Frameworks. Check out our blog to find out the differences between these Javascript frameworks.

Q53. What is the use of ngOnInit in Angular?

Ans:- Angular uses the callback function and lifecycle hook ngOnInit to indicate the creation of a component. It returns a void type and accepts no parameters.

Example:

export class MyComponent implements OnInit {

  constructor() { }

  ngOnInit(): void {

    //....

  }

}

Q54. What is Bootstrap in Angular and how is it embedded?

Ans:- Bootstrap is a powerful toolkit that is used for developing responsive web pages and online apps. It is a set of HTML, CSS, and JavaScript tools.

There are two ways to embed Bootstrap in Angular:

  • Bootstrap CDN - It is a public content delivery network that allows loading the CSS and JavaScript files remotely from its servers.
  • Bootstrap NPM - Another way of including Bootstrap in your Angular project is by using NPM to install it in your project folder.

Q55. Differentiate between Eager and Lazy loading in Angular.

Ans:- The default module-loading method is eager loading. When eager loading is enabled, feature modules are loaded before the app even starts. This method is mostly used in small-scale applications.

Lazy Loading is utilized for larger applications when not every module is necessary at the beginning of the application. When there is a demand, lazy loading dynamically loads the feature modules. Due to this, the application runs more quickly.

Q56. How are promises different from observables in Angular?

Ans:- While observables can manage a series of asynchronous events over time, promises can only handle a single event at a time. Additionally, observables provide us access to a large range of operators that make it simple for us to alter data that is flowing through them.

Q57. What do you understand by Angular Material?

Ans:- A UI component framework called Angular Material enables experts to create consistent, aesthetically pleasing, and fully functioning websites, web pages, and online apps. It can achieve this by adhering to contemporary web design ideas like browser probability and gentle degradation.

Q58. What type of DOM is used by Angular?

Ans:- The regular DOM is used by Angular. Until it reaches the data that has to be changed, this changes the entire tree structure of HTML tags. However, Angular uses Change Detection to make sure that performance and speed are not affected.

Q59. What are impure pipes in Angular?

Ans:- Angular calls an impure pipe for each change detection cycle, regardless of changes to the input fields. For these pipes, several instances of pipes are created. These pipes can receive inputs that can be changed.

Q60. What do you understand by Pipes in Angular?

Ans:- Technically speaking, pipes are designed to take an input value, process it, and then return the changed value as an output. Numerous pipelines are supported by Angular. Custom pipes, on the other hand, can be made to your requirements.

Learn Java in an easy and simple way by going through our simple and easy Java Tutorial For Beginners.

Q61. What do you understand about the PipeTransform interface?

Ans:- The  PipeTransform interface uses the transform() method to change an input value into the appropriate format. Custom pipelines are frequently implemented using it.

Q62. What do you understand by multicasting in Angular?

Ans:- The HttpClient module in Angular allows us to interface with a backend service and retrieve data. Once the data has been retrieved, we can broadcast it to numerous subscribers in a single execution. Multicasting is the process of responding with data to numerous subscribers. It is very helpful when several components of our applications are awaiting data.

Q63.  What are the different phases of AOT?

Ans:- There are 3 different phases of AOT:

  • Code Analysis
  • Code Generation
  • Template Type Checking

Q64. What does the base href tag do?

Ans:- All relative URLs on a page must have a base URL, which is specified by the href attribute.

The base href tag serves as a base path to the component, template, and module files during navigation via the Angular router.

Q65. What do you understand by bootstrapping?

Ans:- Angular bootstrapping enables experts to startup or start the Angular application. Bootstrapping can be done manually or automatically using Angular. Let's quickly comprehend the two.

Manual bootstrapping: It provides experts greater flexibility over how and when to initialize the Angular application. When professionals want to complete other tasks and processes before Angular generates the page, it is quite helpful.

Automatic bootstrapping: If you require Angular to automatically bootstrap the application, automatic bootstrapping can be used to add the ng-app directive to the application's root, frequently on the tag. Once it locates the ng-app directive, Angular imports the related module and then builds the DOM.

Q66. What do you understand by dependency injection?

Ans:- Angular's dependency injection (DI) approach allows objects to be provided as dependencies rather than having to hard-code them into the appropriate components. When it comes to separating the design of object logic from its use, this idea is really helpful.

The module must be loaded before the function "config" can be used to obtain the application components. Additionally, this function enables experts to adjust dependencies in accordance with the requirements.

Q67. Define Angular authentication and authorization.

Ans:- A user's login information is sent to a server-based authenticate API. The server delivers a JSON web token (JWT), which contains the current user's properties and data, after validating the credentials. Additionally, JWT makes it simple to identify the user; this procedure is known as authentication.

Users have different sorts and levels of access after logging in; some may have unrestricted access to all resources, while others may. The level of access for these users is determined by authorization.

Q68. Define the Digest Cycle process in Angular.

Ans:- The digest cycle in Angular is the procedure by which the watch list is watched to keep track of changes in the value of the watch variable. A comparison of the current and prior versions of the scope model values occurs in each digest cycle.

Q69. How to create a service in Angular?

Ans:- An interchangeable object in Angular is the service. Dependency injection is used to wire and combine it. Services are created by registering in the module where they will be used for execution.

Q70. What does RxJS's term "subscribing" mean?

Ans:- When utilizing observables in RxJS, we must subscribe to an observable in order to consume the data that passes through it. A subscriber uses this info that was produced by a publisher. When we subscribe to an observable, we pass in two functions—one for the data and one for errors—so that, in the event of an error, we may display a message or handle the message in some other way.

Q71. What do you mean by Angular Router?

Ans:- Responding to changes in the URL brought about by adding and deleting content from the application is the work of routing in a single-page frontend application. This is a challenging task since we don't want the browser to refresh, therefore we must first intercept a request that modifies the browser's URL. Then, we must choose which material to add and which to delete, and finally, we must modify the URL of the browser so that it displays the user's current page.

Q72. Describe REST.

Ans:- Representational State Transfer is known as REST in Angular. It is an API that responds to HTTP requests. Here, the requested URL leads to the data that needs to be processed, and an HTTP function is then utilized to determine which operation must be carried out on the provided data. RESTful APIs are the name given to the APIs that use this approach.

Q73. What is its scope?

Ans:- In Angular, a scope is an object that refers to the application model. It is a setting in which expressions can be used. These scopes are organized in a hierarchical manner that resembles the DOM structure of the application. A scope helps in observing expressions and propagating various expressions.

Q74. Describe the Angular CLI.

Ans:- Angular command-line interface is another name for Angular CLI. Professionals can utilise Angular's CLI tools to add components, rapidly deploy them, carry out testing, and carry out many other tasks.

Q75. Describe schematic.

Ans:- Complex logic is made possible through schematics, which are template-based code generators. It is often installed via npm and packed into collections. Schematics are used to generate or alter codes in order to change a software project.

Q76. What in Schematics is a rule?

Ans:- A Rule In Schematic, the term "Rule" refers to a set function that accepts a Tree, modifies it, and then outputs a fresh Tree.

Q77. What is Schematics CLI, exactly?

Ans:- Projects for web-based apps are transformed using the Schematics CLI.

Q78. What does Angular multicasting mean?

Ans:- The HttpClient module in Angular allows us to interface with a backend service and retrieve data. Once the data has been retrieved, we can broadcast it to numerous subscribers in a single execution. Multicasting is the process of reacting with data to several subscribers.

Q79. What is HttpClient and what are its advantages?

Ans:- HttpClient is an Angular module used to communicate with backend services over the HTTP protocol. Front-end applications typically use the block API to send requests. However, the fetch API uses promises. Promises are useful, but they don't provide the rich functionality that Observables do. This is why we use HttpClient in Angular. This is because it returns the data as an observable that you can subscribe, unsubscribe, and perform multiple operations to use the operator. Observables can be converted to promises, and observables can also be created from promises.

Q80. What will happen if you don't provide the observer a handler?

Ans:- The observer automatically ignores notifications of that type when a handler is not provided for them, and the observer instance only publishes value when it is subscribed to.

Q81. What browsers does Angular Elements support?

Ans:- Angular elements are supported by Chrome, Edge (Chromium-based), Firefox, Opera, Safari, and other modern browsers through polyfills because Angular is built on the most recent web platform standards. Full Angular apps can run due to polyfills.

Q82. What function does SPA serve in Angular?

Ans:- The term "single page application" is SPA. Even though the URL is continually changing, our technique just keeps index.HTML, one page, up to date. Compared to conventional web technology, SPA technology is simple to develop and extremely fast.

Q83. What are the different types of compilers in Angular?

Ans:- Although they serve quite distinct functions, each of these compilers are useful. Since current browsers can only comprehend JavaScript and not TypeScript, the JIT compiler is utilised to convert TypeScript to JavaScript. When less time has to be spent on compilation and more on development to quickly iterate over features, this compilation step is carried out in a development environment. When we use the ng serve or ng build commands to serve the app locally or produce an uncompressed build of the full codebase, the JIT compiler is utilized.

On the other side, the complete codebase may be utilized in production thanks to a minified build produced by the AOT compiler. We must use the ng build command together with the -prod blog argument in order to utilize the AOT compiler: ng build -prod. This gives the Angular CLI the go-ahead to produce an optimized build of the codebase. This takes a little longer since some optimizations, such as minification might take some time, but this time can be saved for production builds.

Q84.  What are the distinctions between Angular expressions and Javascript expressions?

Ans:- JavaScript expressions and Angular expressions are very different from one another since Angular allows us to write JavaScript in HTML, but plain JavaScript does not. Additionally, all Angular expressions are localized. However, these expressions in JavaScript are only applicable to the global window object. But when the Angular compiler takes the Angular code we've written and turns it into normal JavaScript, which a web browser can subsequently understand and utilize, these differences are resolved.

Q85. What does Angular's server-side rendering entail?

Ans:- In a typical Angular application, JavaScript manages all user interactions while the browser runs our application. Due to this, our page's load time can occasionally be significantly slowed down if we have a huge application with a high bundle size since it must download all the necessary files, parse the JavaScript, and then execute it. We can utilize server-side rendering to get around this delay, which enables us to deliver a completely drawn page from the server that the browser can display and then let the JavaScript code handle any further user interactions.

Q86. Define Angular Universal.

Ans:- A package called Angular Universal makes it possible for Angular apps to use server-side rendering. Using the Angular CLI, we can quickly prepare our application for server-side rendering. The following command must be entered to do this:

ng add @nguniversal/express-engine

Due to this, our Angular application can successfully interact with an ExpressJS web server that builds HTML pages using Angular Universal in response to client requests. Additionally, this generates the app.server.module.ts server-side app module in our application directory.

Q87. What are HttpInterceptors in Angular?

Ans:- HttpInterceptors are used to analyze and alter HTTP requests as well as HTTP responses. They are a component of the @angular/common/HTTP module. These interceptors are designed to carry out checks on a request, alter the answer, and carry out cross-cutting tasks like logging requests, user authentication via requests, response compression using gzip, etc.

Q88. How does Angular allow data to be shared between components?

Ans:- In Angular, there are several ways to communicate data across components rather than just one. They are listed as follows:

  • Parent to Child: via Input
  • Child to Parent: via Output() and EventEmitter
  • Child to Parent: via ViewChild
  • Unrelated Components: via a Service

Q89. What does ng-content do and why?

Ans:- In Angular, ng-content is used to dynamically insert material into the component. It helps in sending content inside the component selector and enhancing component reuse.

Q90. Explain ngcc.

Ans:- An Angular utility called the ngcc (Angular Compatibility Compiler) transforms node modules that were created using the non-Ivy ngc into Ivy-compatible formats.

Q91. What do you understand by folding?

Ans:- When Angular generates the code, it's possible that some of the non-exported members get folded. This procedure, known as folding, in which the collector evaluates an expression and records the outcome in the.metadata.json file, is known as folding.

Q92. How do macros work?

Ans:- A section of computer code known as a macro aids in the automation of repetitive tasks. It typically operates in an Excel setting. Macros are supported by Angular in the form of functions, static methods, and other constructs. Take a look at the Angular Macros code sample below:

export function wrapInArray(value: T): T[] {

return [value];

}

Q93. How does the State function work?

Ans:- In Angular, the State function identifies an animation state in a trigger connected to an element. The State function's syntax is as follows:

state(name: string, styles: AnimationStyleMetadata, options?: { params: { [name: string]: any; }; }): AnimationStateMetadata

Q94. How does the State function work?

Ans:- In Angular, the Style function is used to declare a key/value object that includes CSS styles and attributes that are utilized for animation. The Style function's syntax is provided by:

style(tokens: "*" | { [key: string]: string | number; } | ("*" | { [key: string]: string | number; })[]): AnimationStyleMetadata

Q95. Explain NgZone.

Ans:- NgZone is a service offered by Angular that enables you to use the run() method to execute functions in the Angular zone. When NgZone automatically initiates change detection at the appropriate moment, this execution is carried out.

Q96. Explain NoopZone.

Ans:- NoopZone helps Angular in determining and understanding when to initiate the change detection. However, the NoopZone also has to be defined if Angular is to be used without a zone.

Q97. What are router imports?

Ans:- Angular Core does not include the Angular Router that represents a specific component view for a given URL. To import the necessary router components, use the @angular/router library. For instance, we import them as seen below in the app module.

import { RouterModule, Routes } from '@angular/router';

Q98. What is a router outlet?

Ans:- The RouterOutlet directive from the router library marks the location in the template where the router should show the components for that outlet. It serves as a placeholder. The router outlet is utilized as a component.

Q99. What are links in a router?

Ans:- The router has authority over such elements thanks to the RouterLink directive on the anchor tags. You can pass string values to the router-link directive as shown below since the navigation pathways are fixed.

Angular Router

  List of todos

  Completed todos

Q100. What are router active links?

Ans:- According to the current RouterState, the RouterLinkActive directive changes the CSS classes for active RouterLink bindings. For example, while this link is active, the Router will add CSS classes, and when it is inactive, it will delete them. You may, for instance, add them to RouterLinks as seen below.

Angular Router

 List of todos

 Completed todos

Q101. Explain the router condition.

Ans:- A tree of active routes makes up RouterState. The "consumed" URL segments, the extracted parameters, and the resolved data are all known to every node in this tree. Using the Router service and the router state property, you can access the current RouterState from anywhere in the application.

@Component({templateUrl:'template.html'})

class MyComponent {

  constructor(router: Router) {

    const state: RouterState = router.routerState;

    const root: ActivatedRoute = state.root;

    const child = root.firstChild;

    const id: Observable = child.params.map(p => p.id);

    //...

  }

}

Q102. What are router events?

Ans:- You can follow the evolution of the route by using the Router.events property, which the Router broadcasts during each traversal. The following is the order of router events.

  • NavigationStart,
  • RouteConfigLoadStart,
  • RouteConfigLoadEnd,
  • RoutesRecognized,
  • GuardsCheckStart,
  • ChildActivationStart,
  • ActivationStart,
  • GuardsCheckEnd,
  • ResolveStart,
  • ResolveEnd,
  • ActivationEnd
  • ChildActivationEnd
  • NavigationEnd,
  • NavigationCancel,
  • NavigationError
  • Scroll

Q103. What will happen if you don't provide the observer with a handler?

Ans:- The observer automatically ignores notifications of that type when a handler is not provided for them, and the observer instance only publishes value when it is subscribed to.

Q104.What function does Angular's common module serve?

Ans:- The common module in Angular is a module that contains all the frequently used elements of Angular, such as services, pipes, directives, etc. It is accessible under the package @angualr/common. Additionally, it contains a few sub-modules, including the HttpClientModule from the @angular/common/http package. Due to Angular's modular design, its functionalities are kept in small, self-contained modules that can be imported and added to our applications as needed.

Q105. What distinguishes JavaScript expressions from Angular expressions?

Ans:- JavaScript expressions and Angular expressions are very different from one another since Angular allows us to write JavaScript in HTML, but plain JavaScript does not. Additionally, all Angular expressions are localized. However, these expressions in JavaScript are only applicable to the global window object. But when the Angular compiler takes the Angular code we've written and turns it into normal JavaScript, which a web browser can subsequently understand and utilize, these inconsistencies are resolved.

These Angular Interview Questions For Experienced Professionals will give you an edge over other candidates in your interview. Prepare this practical and in-depth Angular interview questions guide to answer any question correctly.

Java Certification Training Online

  • Personalized Free Consultation
  • Access to Our Learning Management System
  • Access to Our Course Curriculum
  • Be a Part of Our Free Demo Class

Conclusion

We hope that this post on Angular Interview Questions and answers has given you a better understanding of the questions that can be asked and how to answer them. However, certification will be useful if you want to learn Angular and possibly apply it to get your dream job.

With JanBask Training’s Angular Certification Course, you can master web development applications. The course will help you gain skills like facilitating the development of SPA applications, Typescript, components, and directives. You will also learn to work on real-world projects and gain hands-on experience. 

Drop us a comment, if you have any questions for us. Our team of experts will reach you soon!

FAQs on Angular Programming Courses

Q1. What are the career opportunities after learning Angular?

Ans:- Angular is a popular front-end development tool. This is due to the fact that Angular provides the most ideal option for every kind of required web application. The need for qualified developers is at an all-time high and will only increase as more businesses use Angular.

Q2. What learning material will be provided if I get access to Angular Training Program online?

Ans:- Upon enrollment, you will have immediate access to the LMS, which is available to you permanently. All of the prior class recordings, PPTs, PDFs, and assignments will be available to you. Additionally, immediate access to our round-the-clock support staff will be provided. You can immediately begin learning.

Q3.  What are the course objectives of Angular Certified Training?

Ans:-The course objectives of the Angular Training Program are:

  • Develop a proper understanding of Web Application Development Architecture 
  • Create Angular applications using Angular CLI commands 
  • Create Angular components using TypeScript 
  • Interact with raw DOM elements using directives 
  • Inject services using Dependency Injection
  • Fetch data and capture it using observables
  • Configure Angular Router to modularize applications
  • Perform form-validation
  • Write Test Cases for your web application
  • Deploy applications using Docker and Nginx
  • Develop a front-end application

Q4.  What is the average salary of Angular Developers?

Ans:-On the employment market, Angular developers are in high demand. An Angular Developer can expect to earn between $81,088 and $132,138 per year on average.

Q5. Why should I enroll in the Angular Training Program?

Ans:- The Angular training course will assist you in understanding and mastering Angular principles like dependency injection, typescript, components, directives, model-view-controller, etc. which make it easier to construct single-page web apps.

With the help of Angular Certification training, it is simple to understand and possible to create reliable apps for any size of the project.

Q6. Who should enroll in the Angular Training Course?

Ans:- The Angular Training Course is best suited for those who are interested in learning UI development and students.

  • UI Developers
  • Technical Project Leads and Technical Project Managers
  • Complete Web Developers
  • Architects and QAs

Anyone who wants to learn how to use a cutting-edge front-end JavaScript framework for their business or career.

Q7. What skills do I need to learn Angular?

Ans:- It would be beneficial for you to have knowledge of TypeScript before beginning to study Angular. Learning TypeScript will enable you to better understand Angular since it provides an interface, static typing, and module support—all essential components of Angular. It may be easier for you to learn Angular if you have some experience with a command-line interface (CLI), as it will help in developing more user-friendly applications.


     user

    Jyotika Prasad

    Through market research and a deep understanding of products and services, Jyotika has been translating complex product information into simple, polished, and engaging content for Janbask Training.


Comments

  • D

    Dallas Phillips

    Do you offer SQL certification courses?

     Reply
    • logo16

      JanbaskTraining

      Thank you for reaching us! Yes! We do provide courses for students and professionals at affordable prices.

    • logo16

      JanbaskTraining

      Hi, Thank you for reaching out to us with your query. Drop us your email id here and we will get back to you shortly!

  • C

    Cody Campbell

    Informative article. Thank you for posting it!

     Reply
    • logo16

      JanbaskTraining

      Glad you like our article! Keep reading and sharing!

    • logo16

      JanbaskTraining

      Glad you found this useful! For more such insights on your favorite topics, do check out JanBask Blogs and keep learning with us!

  • C

    Chance Parker

    Finally, I found an article on SQL that is easy to read and understand. Rock on!

     Reply
    • logo16

      JanbaskTraining

      Thank you for those motivating words!

    • logo16

      JanbaskTraining

      Hi, Thank you for reaching out to us with your query. Drop us your email id here and we will get back to you shortly!

  • J

    Jensen Evans

    Beginner-friendly read!

     Reply
    • logo16

      JanbaskTraining

      Thank you for that feedback!

    • logo16

      JanbaskTraining

      Glad you found this useful! For more such insights on your favorite topics, do check out JanBask Blogs and keep learning with us!

  • F

    Finley Edwards

    A sensible article from the writer. Thank you for posting.

     Reply
    • logo16

      JanbaskTraining

      Glad our blog helped you!

    • logo16

      JanbaskTraining

      Hi, Thank you for reaching out to us with your query. Drop us your email id here and we will get back to you shortly!

Related Courses

Trending Courses

salesforce

AWS

  • AWS & Fundamentals of Linux
  • Amazon Simple Storage Service
  • Elastic Compute Cloud
  • Databases Overview & Amazon Route 53
salesforce

Upcoming Class

2 days 04 Feb 2023

salesforce

DevOps

  • Intro to DevOps
  • GIT and Maven
  • Jenkins & Ansible
  • Docker and Cloud Computing
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

Data Science

  • Data Science Introduction
  • Hadoop and Spark Overview
  • Python & Intro to R Programming
  • Machine Learning
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

Hadoop

  • Architecture, HDFS & MapReduce
  • Unix Shell & Apache Pig Installation
  • HIVE Installation & User-Defined Functions
  • SQOOP & Hbase Installation
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

Salesforce

  • Salesforce Configuration Introduction
  • Security & Automation Process
  • Sales & Service Cloud
  • Apex Programming, SOQL & SOSL
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

QA

  • Introduction and Software Testing
  • Software Test Life Cycle
  • Automation Testing and API Testing
  • Selenium framework development using Testing
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

Business Analyst

  • BA & Stakeholders Overview
  • BPMN, Requirement Elicitation
  • BA Tools & Design Documents
  • Enterprise Analysis, Agile & Scrum
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

MS SQL Server

  • Introduction & Database Query
  • Programming, Indexes & System Functions
  • SSIS Package Development Procedures
  • SSRS Report Design
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

Python

  • Features of Python
  • Python Editors and IDEs
  • Data types and Variables
  • Python File Operation
salesforce

Upcoming Class

15 days 17 Feb 2023

salesforce

Artificial Intelligence

  • Components of AI
  • Categories of Machine Learning
  • Recurrent Neural Networks
  • Recurrent Neural Networks
salesforce

Upcoming Class

1 day 03 Feb 2023

salesforce

Machine Learning

  • Introduction to Machine Learning & Python
  • Machine Learning: Supervised Learning
  • Machine Learning: Unsupervised Learning
salesforce

Upcoming Class

22 days 24 Feb 2023

salesforce

Tableau

  • Introduction to Tableau Desktop
  • Data Transformation Methods
  • Configuring tableau server
  • Integration with R & Hadoop
salesforce

Upcoming Class

1 day 03 Feb 2023

Interviews