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Practicing advanced Angular interview questions for experienced developers can help you nail your upcoming technical interview. You must carefully frame your answers to the interview questions and prove your expertise in creating seamless user experiences and interfaces using Angular.
Top FAANG+ companies are keen on hiring software developers who know various in-demand frameworks, including Angular. Your marketability hinges on ensuring you master the programming and developing skills related to Angular frameworks.
In this article, we will explain what is Angular and its various versions. We also present some advanced Angular interview questions for experienced developers. In addition, we also shed some light on the commonly asked advanced Angular interview questions for senior developers. Further, we also present some Angular scenario-based interview questions and answers.
What is Angular and Its Different Versions?
According to Statista, Angular is one of the most used web frameworks among developers globally, with a 17.46% share of respondents.
Angular is a popular TypeScript-based web application framework introduced by Google. It is an open-source front-end JavaScript framework. It is ideal for developing scalable, enterprise web applications with reusable code. Here's a list of the different versions and their release dates:
- Angular version 1 or AngularJS (2010)
- Angular version 2 (September 2016)
- Angular 4 (March 2017)
- Angular 5 (November 2017)
- Angular 6 (May 2018)
- Angular 7 (October 2018)
- Angular 8 (May 2019)
- Angular 9 (February 2020)
- Angular 10 (June 2020)
- Angular 11 (November 2020)
- Angular 12 (May 2021)
- Angular 13 (November 2021)
Note: Click on the version to access the most anticipated interview questions for the same.
Angular Interview Questions for Experienced Developers
If you are an experienced web developer, your answers to the advanced interview questions should be articulated and meaningful. It is of great help to know what interview questions you could expect at your upcoming job interview as you can prepare strategically for them.
You can boost your interview preparation by going through the following Angular interview questions and answers for experienced.
Q1. What Is A Formbuilder? How Will You Import The Formbuilder Into Your Project?
Answer this advanced Angular interview questions for experienced developers by stating that the FormBuilder provides a syntactic sugar that speeds up FormControl, FormGroup, and FormArray objects' creation. It shortens creating instances and reduces the requirement of boilerplate code to build complex forms. Moreover, it also provides easy-to-use methods for control generation.
You can take the following steps to use the FormBuilder service:
- Import the FormBuilder into your project by using the following command: import { FormBuilder } from '@angular/forms';
- Once you inject the FormBuilder service, you can create the form's contents.
Q2. How Will You Update The View If Your Model Data Is Updated Outside The 'zone'?
Answer this advanced Angular interview questions for experienced developers by stating the following:
- ApplicationRef.prototype.tick(): It performs change detection on the entire component tree.
- NgZone.prototype.run(): It also performs change detection on the complete component tree. Moreover, the run() calls the tick itself. The parameter takes the function before the tick and executes it.
- ChangeDetectorRef.prototype.detectChange(): It launches the change detection on the current component, including its children.
Q3. How Are Observables Different From Promises?
You can use the following table to answer this advanced Angular interview questions for experienced developers.
| Observables |
Promises |
| They handle multiple asynchronous events over a period of time | They deal with a single asynchronous event at a time |
| They are lazy, i.e., they are not executed until we use the subscribe() method | They are not lazy, i.e., they are executed immediately after creation |
| Cancellable subscriptions using the unsubscribe() method | Promises are not cancellable |
| They deliver errors to the subscribers | They push the errors to child promises |
| Observables provide operations such as reduce, filter, retryWhen | They do not provide operations |
Q4. Why Is There A Need For Compilation? What Are The Two Types Of Compilation In Angular?
Answer this advanced Angular interview questions for experienced developers by stating that the Angular applications need to be compiled as every application has components and templates that are incomprehensible to the browser. So, it is essential to compile them before running them inside the browser.
The two types of compilations are as follows:
- Just-in-Time or JIT compilation: The application compiles inside the browser during runtime.
- Ahead-of-Time or AOT compilation: The application compiles during the build time.
Q5. What Are The Advantages Of Using AoT Compilation?
You can answer this advanced Angular interview questions for experienced developers by highlighting the following advantages of using AoT compilation:
- The application compilation occurs before running inside the browser, allowing the browser to load the executable code and immediately render the application. Thus, AOT provides faster rendering.
- AOT needs fewer ajax requests since the compiler sends the external HTML and CSS files with the application; it eliminates the requirement of separate AJAX requests for those source files.
- It minimizes errors as they can be detected and handled during the building phase.
- It provides better security to the applications as the compiler adds HTML and templates into the JS files beforehand, and there are no extra HTML files to be read.
Q6. What is Dependency Injection?
Dependency injection is one of the primary Angular concepts. It is an application design pattern. Dependencies are services that have the functionality required by various components in an application. Angular provides a seamless mechanism for making dependencies that are injectable across the various components of an application.
Q7. What Do You Understand About Angular CLI?
Angular CLI stands for Angular command-line interface. It lets you initialize, develop, scaffold, and maintain web applications directly from a command shell. You can also use CLI to create components, services, pipes, and directives. It assists in building, testing, and serving, thus making the Angular development workflow quicker and much easier.
Q8. What is HttpClient?
HttpClient is a popular Angular module. You can use it for communicating with a backend service through the HTTP protocol. Although promises are useful, they lack certain functionalities that observables offer. The use of HttpClient in Angular returns the data as an observable, thus allowing us to subscribe, unsubscribe, and perform operations.
Q9. What is Multicasting?
Using the HttpClient module, you can communicate with a backend service and fetch data. Multitasking allows you to broadcast this fetched data to multiple subscribers in one execution. It is beneficial when we have multiple application parts waiting for some data. You require an RxJS subject to use the multicasting feature.
Q10. How Will You Set, Get, And Clear Cookies In Angular?
You will have to include the module: ngCookies angular-cookies.js in Angular for using cookies.
Recommended Reading: Angular Interview Questions You Must Prepare for in 2023
Latest Angular Interview Questions For Experienced Professionals
You must prepare the latest Angular interview questions and answers for experienced developers. Here is a list of some interview questions for the latest versions of Angular.
Angular 9 Interview Questions
- How is Constructor different from ngOnInit?
- What's new about Angular 9?
- What were the improvements in the tree shaking in Angular 9?
- What is new in Angular ivy in Angular 9?
- Explain the new options for 'providedIn' in the 9th version.
Angular 10 Interview Questions
- Why was bazel deprecated in version 10?
- How is Angular 10 better than the previous version?
- How does Angular 10 boost ngcc performance?
- What are the advantages of choosing Angular 10?
Angular 11 Interview Questions
- How does Angular 11 offer support for Hot Module Replacement?
- What is an operation byelog?
- What is automatic font inlining in Angular 11?
- What is the use of the parallel function?
- How does the manualChangeDetection function impact change detection in Angular 11?
- Why did Angular 11 promote ESLint over TSLint?
Angular 12 and 13 Interview Questions
- What is the component test harness in Angular 12?
- What is a nullish coalescing operator?
- What should you migrate to Angular 12?
- Why is the View Engine no longer available in Angular 13?
- Why has IE 11 support been removed in Angular 13?
This completes the list of Angular interview questions and answers for technical interview preparation.
Angular Scenario-Based Interview Questions for Experienced Developers
The following are some scenario-based interview questions that aim at assessing your technical knowledge as well as problem-solving abilities. Essentially, these questions help hiring managers determine if you are the right fit for the company.
- Imagine a situation where multiple components need to access the same data source. How would you handle such a situation?
- What approach will you use to optimize an Agular application's performance that has many data-binding operations?
- What is your take on implementing a dynamic form in Angular where the form fields change depending on the user's input?
- How will you manage error handling for a large-scale Angular application?
- How will you debug the performance bottlenecks in an Angular application?
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FAQs: Advanced Angular Interview Questions for Experienced Developers
Q1. How do you handle performance optimization in Angular applications?
Performance can be optimized using Angular features like lazy loading, change detection strategy optimization, and AOT compilation to minimize load time.
Q2. What are Angular pipes, and how are they used?
Pipes in Angular are used to transform data in templates. They can format data, such as currency or dates, or apply custom transformations using custom pipes.
Q3. Can you explain Angular’s ‘Routing Guards’?
Routing guards in Angular control the navigation to and from routes by implementing logic that allows or prevents users from accessing specific parts of the application.
Q4. What is the significance of NgModules in Angular?
NgModules in Angular organizes an application into cohesive blocks of functionality, grouping related code and helping to manage dependencies efficiently.
Q5. What are custom directives in Angular?
Custom directives are user-defined Angular directives that manipulate DOM elements or their behavior. They are used to extend the capabilities of HTML.
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