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Developers often undergo through a rigorous internships and certifications before expertise on their field. Front end development is interlinked with others like back end, UI/UX design, frame work and language used. Therefore, comprehensive knowledge of associated tools, languages, coding and development is crucial. Front end development interview questions and answer in 2023 will involve new technology.

For example, interviewer may check knowledge of AI, layout, navigation, speed, and optimization from interviewee. Interviewer may ask difficult or easy question depending n the skill set and experience of front end developer candidate. Most often, front end development companies hire experience and skilled staff. But they provide equal to juniors providing internship opportunities.

Before applying for interview, candidate must know the basics of front end so he must enter the room with full preparation, confidence and knowledge of front-end. Here are some questions for the interview of front end developer that are

What is front end and back end web development?

Front-end web development refers to the part of web development that deals with the user interface and user experience of a website. This includes the design, layout, and functionality of the website. Back-end web development, on the other hand, deals with the server-side logic and database interactions of a website.

Which language is best for front end development?

JavaScript is the most widely used language for front-end development, but other languages such as HTML and CSS are also important. Frameworks and libraries such as React, Angular, and Vue.js are also commonly used in front-end development.

What skills does a front-end developer need?

A front-end developer should have strong skills in HTML, CSS, and JavaScript. They should also be familiar with web development best practices, be able to create responsive designs, and have experience working with browser developer tools. Knowledge of version control systems (such as Git) and task runners (such as Grunt or Gulp) is also important.

How do I prepare for a front-end developer interview?

To prepare for a front-end developer interview, it is important to brush up on your knowledge of HTML, CSS, JavaScript, and any related frameworks and libraries. You should also be familiar with web development best practices and be able to talk about specific projects you have worked on and the challenges you faced. Additionally, it’s good to have a portfolio of your work that you can show to the interviewer.

How much do front end developers get paid?

The salary for front-end developers can vary depending on location, experience, and company size. According to Glassdoor, the average salary for a front-end developer in the United States is around $78,000 per year.

Is front end developer a good career?

Front-end development can be a good career for those who enjoy solving problems, creating visually appealing interfaces, and working with the latest web development technologies. It’s a fast-paced and dynamic field that is constantly evolving, so it’s suitable for those who enjoy learning new things.

Is front end better than backend?

It is not a matter of one being better than the other, as both front-end and back-end development are important for building a complete website or application.

Is front end easier than backend?

It depends on the individual developer’s skills and experience. Some developers may find front-end development easier than back-end development, while others may find the opposite to be true.

Which is more in demand front end or backend?

The demand for front-end and back-end developers can vary depending on the current market and specific industry. However, in general, both front-end and back-end development are in high demand as the need for web and mobile application development continues to grow.

According to some recent research, front-end developers are in high demand as user experience and interactivity are becoming more important, while back-end developers are also in demand as the need for server-side logic and data management continues to grow.

When it comes to hiring a front-end developer, it’s important to ask the right questions to ensure that the candidate has the necessary skills and experience to deliver high-quality work. Here are the top interview questions Hr manager or senior developer ask when hiring a front-end developer.

Why should we hire you as a front – end developer?

You should hire me as a front-end developer because I have a strong understanding of web development technologies and best practices. I am able to create visually appealing and user-friendly interfaces and have a proven track record of delivering projects on time and on budget. I am also a quick learner and I am able to adapt to new technologies and methodologies.

What is the most challenging work you have ever done as a front-end developer?

The most challenging work I have ever done as a front-end developer was creating a website that had to work seamlessly across multiple devices and browsers. I had to ensure that the website was compatible with different screen sizes and resolutions, and that it was optimized for both mobile and desktop. I also had to ensure that the website was accessible to users with disabilities.

In an image tag, what is the benefit of the srcset attribute?

The srcset attribute in an <img> tag allows the developer to specify different sources for an image depending on the screen resolution or device. This allows for better performance by loading the most appropriate image for the user’s device.

List some of the basic goals that a front-end developer should be mindful of.

A front-end developer should be mindful of several basic goals, including creating an engaging user interface, making sure the application is visually appealing, and ensuring that the application is easy to navigate. They should know the importance of performance optimization and keeping up with the latest technological trends.

What measures do you take to ensure your app design is highly engaging and user-friendly?

A good front-end developer will take several measures to ensure that their app design is engaging and user-friendly. This can include conducting user research and testing, using best practices for layout and design, and implementing responsive design to ensure that the application looks great on all devices. They may also use tools such as A/B testing to optimize the user experience.

How to solve a problem while working on a front-end development project

This question can give you a sense of how the candidate approaches problem-solving and their level of experience. The candidate should be able to give a specific example of a problem they faced and how they were able to overcome it. This could include anything from troubleshooting a bug to optimizing page load times.

What steps should developer take to make application visually appealing?

A front-end developer must ensure that an application is visually appealing. This could include using a consistent color palette, choosing appropriate typography, and using images and graphics effectively. They must tell how they use CSS and other styling languages to create a polished and professional look for the application.

How programmers keep up with the latest technological trends?

Keeping up with the latest technological trends is crucial for front-end developers. They must stay up-to-date, such as following industry blogs and social media accounts, attending conferences and workshops, and experimenting with new technologies in their spare time.

How do developers optimize front-end performance?

Performance optimization is an important aspect of front-end development. A good developer should optimize front-end performance, such as using tools to test page load times, minifying assets, and implementing code splitting loading.

How front-end developer fix browser-specific style incompatibility?

Browser-specific style incompatibility can be a major issue for front-end developers. A good candidate should be able to give specific examples of how they address this problem, such as using feature detection, implementing a CSS preprocessor like SASS or LESS, or using a CSS reset or normalize library like Normalize.css.

Explain meta tags in HTML?

Meta tags in HTML provide metadata about the document, such as keywords for search engines, character encoding, and description. They are placed in the head section of an HTML document and can be used to specify information about the document that is not visible on the web page.  Interview questions for front end developer also involved knowledge of HTML.

Name some basic design elements?

Basic design elements include color, typography, imagery, layout, and user interface elements such as buttons and forms.

What Is Load Balancing?

Load balancing is a technique used to distribute workloads evenly across multiple servers, ensuring that no single server is overwhelmed with too much traffic and ensuring that the system remains available to users.

What npm is used for?

npm (Node Package Manager) is used to manage and share packages (libraries and modules) for JavaScript projects. It allows developers to easily download and use pre-built code, as well as easily share and distribute their own code.

What is SQL injection?

SQL injection is a type of attack in which an attacker injects malicious code into a SQL statement, in order to gain unauthorized access to or manipulate data in a database.

What is webpack?

Webpack is a JavaScript module bundler that takes all of the individual files in a project and combines them into a single bundle that can be loaded by a browser. It also allows for optimization of the code, such as minification and transpilation.

Why and when should I use Webpack?

Webpack should be used when a project has multiple JavaScript files that need to be bundled and optimized for performance. It can also be used for managing and loading other assets such as CSS and images.

Explain the CSS box model and the layout components that it consists of

The CSS box model describes the layout of an HTML element and consists of the content, padding, border, and margin. The content is the area where text or images are placed, the padding is the space between the content and the border, the border surrounds the padding and content, and the margin is the space outside of the border.

What is Scope in JavaScript?

In JavaScript, scope refers to the accessibility or visibility of variables, functions, and objects in some particular part of your code during runtime.

How JavaScript and jQuery are different?

JavaScript is a programming language and jQuery is a JavaScript library. JavaScript is a powerful and versatile language, but it can be complex and verbose, whereas jQuery simplifies common tasks and makes it easier to work with the Document Object Model (DOM) and handle events.

What are advantages of REST web services?

Advantages of REST web services include being lightweight, being platform- and language-independent, being easily scalable, and having a simple and consistent interface.

What is Content Security Policy?

Content Security Policy (CSP) is a security feature that helps to prevent cross-site scripting (XSS) and other code injection attacks by specifying the sources from which the browser should load resources.

What is Cross-Site Scripting (XSS)?

Cross-Site Scripting (XSS) is a type of security vulnerability that allows an attacker to inject malicious code (such as scripts) into a web page viewed by other users.

What is User-Centered Design?

User-centered design is a design process in which the needs, wants, and limitations of the end user are the main focus of the design and development process.

What is Callback Hell and what is the main cause of it?

Callback hell refers to a situation where multiple nested callback functions make the code hard to read and maintain. An excessive use of callbacks instead of using more advanced control flow mechanisms like Promises causes it.

What is Polymorphism?

Polymorphism is the ability of an object to take on many forms. In object-oriented programming, polymorphism refers to the ability of a single function or method to work with different types of data.

What is Encapsulation?

Encapsulation is a mechanism of hiding the internal details of an object from the outside world and exposing only the necessary details through a set of methods. It allows for the implementation of an object to change without affecting the code.

What is Sass?

Sass (Syntactically Awesome Style Sheets) is a CSS preprocessor that adds features such as variables, nested rules, and mixins to CSS.

What is a CSS rule?

A CSS rule is a statement that defines how an HTML element should be styled. It consists of a selector and a set of properties and values.

What is meant by the KISS principle?

The KISS principle stands for “Keep It Simple, Stupid” and advises developers to keep their code simple and easy to understand.

What is the difference between span and div?

The <span> element is an inline element used for small inline sections of text, while the <div> element is a block-level element used for larger sections of text.

Why do we use jQuery?

jQuery is a JavaScript library that simplifies common tasks such as manipulating the DOM, making AJAX requests, and handling events.

How does concurrency work in Node.js?

In Node.js, concurrency is achieved through the use of non-blocking I/O and an event loop. Node.js can handle multiple requests simultaneously by queuing them and processing them asynchronously.

Mention what is the difference between PUT and POST?

PUT and POST are both HTTP methods used to send data to a server, but they have different meanings. PUT is used to update an existing resource, while POST is used to create a new resource.

Name fundamental principles of design.

Some fundamental principles of design include contrast, balance, alignment, repetition, and proximity.

What does SOLID stand for? What are its principles?

SOLID stands for the five principles of object-oriented programming design: Single responsibility, Open-closed, Liskov substitution, Interface segregation, and Dependency inversion.

What is Click Jacking?

Clickjacking is a type of cyber-attack where a malicious website or email disguises a button or link to trick a user into clicking on it, leading to unwanted actions.

What is Coercion in JavaScript?

Coercion in JavaScript refers to the process of converting a value from one data type to another, such as converting a string to a number.

What is IIFEs (Immediately Invoked Function Expressions)?

IIFEs (Immediately Invoked Function Expressions) are JavaScript functions that are executed immediately after they are defined.

What is a Grid System in CSS?

A Grid System in CSS is a set of CSS classes and layout rules that are used to create a consistent grid-based layout for a webpage.

What is a Mixin and how to use on?

A Mixin is a reusable piece of code that can be included in multiple CSS rules to reduce code repetition.

What’s new in HTML 5?

Some new features in HTML 5 include new semantic elements such as <header>, <nav>, <article>, <section>, and <footer>, as well as new form controls and multimedia elements.

When would you use AngularJS vs jQuery?

AngularJS is a JavaScript framework used for building complex, large-scale web applications, while jQuery is a simpler library that is better suited for small-scale web development tasks.

How would you scale the Node application?

To scale a Node application, one can use a reverse proxy, load balancer, and/or multiple Node.js instances.

Name some best practices for better RESTful API design.

Some best practices for RESTful API design include using proper HTTP status codes, versioning the API, providing clear documentation, and using a consistent naming convention.

What is Closure in JavaScript? Provide an example.

A closure in JavaScript is a function that has access to variables in its containing scope, even after the containing function has returned.

Explain the Prototype Design Pattern.

The Prototype Design Pattern is a creational design pattern that allows objects to inherit from other objects.

What’s the difference between resetting and normalizing CSS? Which would you choose, and why?

Resetting CSS sets all elements to a consistent baseline, while normalizing CSS preserves some browser defaults and makes them consistent across different browsers. The choice between the two depends on the specific needs of the project.

Name the major HTTP requests.

The major HTTP requests are GET, POST, PUT, DELETE, and PATCH.

State the difference between == and ===?

== compares the values of two variables and returns true if they are equal. === compares the values and the data types of two variables and returns true only if they are equal and of the same data type.

What is React JS?

React JS is a JavaScript library for building user interfaces. It allows developers to build reusable UI components and manage the state of the application in a efficient way.

How browsers render the UI?

Browsers render the UI by interpreting the HTML and CSS code and displaying it on the screen. They use a layout engine to calculate the size and position of elements and a rendering engine to display the elements on the screen.

Mention three ways to decrease page load time?

Three ways to decrease page load time include:

  • Minifying and compressing files
  • Using a Content Delivery Network (CDN)
  • Optimizing images.

What is the difference between attribute and property?

In HTML, an attribute is a property of an HTML element that is used to define its characteristics, such as its id or class. A property, on the other hand, is a property of the JavaScript object that represents the HTML element.

Suggest how we can optimize our front-end page.

To optimize a front-end page, you can:

  • Minimize HTTP requests by combining files and using a Content Delivery Network (CDN)
  • Minimize the size of files by compressing images and minifying CSS and JavaScript
  • Use a framework or library such as React or Angular to improve the performance of dynamic content.

Mention the pitfalls for using a CSS Preprocessor like Sass?

Some pitfalls for using a CSS preprocessor like Sass include:

  • Increased complexity and maintenance issues if not used properly
  • Difficulty for other developers to understand or work with the code
  • Increased build time if not configured properly

Suggest some ways on how to fix the browser-specific styling issue?

To fix browser-specific styling issues, you can:

  • Use CSS normalization or reset stylesheets to ensure consistency across browsers
  • Use feature detection to target specific browser functionality
  • Use browser-specific prefixes for CSS properties to ensure compatibility with different browsers

What do you know about the CSS image sprites and why it is utilized?

CSS image sprites are a technique for reducing the number of HTTP requests made by a web page by combining multiple images into a single image. This improves the performance of the website by reducing the time it takes to load the images.

Mention the difference between MySQL and MongoDB.

MySQL is a relational database management system (RDBMS) that uses tables, rows, and columns to organize data. MongoDB, on the other hand, is a document-oriented database management system (DBMS) that uses a flexible document data model, which allows for more dynamic and unstructured data.

Define the Anonymous function in JS?

An anonymous function in JavaScript is a function without a name. It can be used as a callback function, or can be immediately invoked (IIFEs). An example of an anonymous function is

(function () { console.log(“Anonymous function”); })();

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