60+ Front end Web Developer Interview Questions and Answers

Z-index is a CSS property that controls the stacking order of elements on a web page.

• Higher z-index values place elements on top of lower ones

• Z-index only works on positioned elements (position: absolute, position: relative, position: fixed)

• Negative z-index values place elements behind the default stacking order

• Z-index can be used to create layered effects on a web page

ReactJS is used for building interactive user interfaces, while JavaScript is the programming language that powers web development.

• ReactJS allows for component-based architecture, making it easier to manage and update UI elements.

• ReactJS uses a virtual DOM for efficient rendering, improving performance.

• JavaScript is the language used to add interactivity and dynamic behavior to web pages.

• JavaScript is essential for client-side scripting, form validation, and AJAX requests.

• Bot...read more

I will create a visually appealing home page with a professional design and user-friendly layout.

• Use a clean and modern design with a consistent color scheme

• Include a navigation menu for easy access to different sections

• Add engaging visuals such as images or videos to capture user attention

• Incorporate responsive design to ensure compatibility with various devices

Redux is a predictable state container for JavaScript apps. useRef is a hook in React for accessing DOM nodes.

• Redux is a state management library for JavaScript applications

• It helps in managing the state of an application in a predictable way

• Redux follows a unidirectional data flow pattern

• useRef is a hook in React that allows accessing DOM nodes or any other mutable value

• It returns a mutable ref object that persists across re-renders

The architecture of my React web application follows a component-based structure with state management using Redux.

• Components are organized into reusable and independent units for UI elements.

• State management is handled using Redux to manage application state globally.

• Data flow is unidirectional, with actions triggering state changes through reducers.

• Routing is implemented using React Router for navigation between different components.

• API calls are made using libraries like A...read more

Event loop is a mechanism that allows JavaScript to handle multiple tasks simultaneously.

• Event loop is a part of JavaScript runtime environment.

• It continuously checks the call stack and the task queue.

• If the call stack is empty, it takes the first task from the queue and pushes it to the call stack.

• Examples of tasks include user input, network requests, and setTimeout() functions.

An abstract class is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class can have abstract and non-abstract methods.

• Abstract methods have no implementation and must be implemented by the derived class.

• An abstract class can have constructors, fields, and non-abstract methods.

• An abstract class is declared using the 'abstract' keyword.

• Example: abstract class Shape { abstract void draw(); }

Flexbox and CSS grid are layout modules in CSS that allow for responsive and flexible web design.

• Flexbox is a one-dimensional layout system that allows for easy alignment and distribution of elements within a container.

• CSS grid is a two-dimensional layout system that allows for more complex and flexible layouts.

• Flexbox is best for arranging items in a single row or column, while CSS grid is best for creating more complex layouts with multiple rows and columns.

• Both Flexbox and...read more

React is a JavaScript library for building user interfaces.

• React allows for reusable UI components

• It uses a virtual DOM for efficient updates

• React is declarative, making it easier to understand and debug code

• It has a large and active community with many resources available

• React can be used for both web and mobile app development

Create a visually appealing landing page with animations to engage users.

• Use CSS animations to create movement and transitions

• Incorporate interactive elements like hover effects or scrolling animations

• Consider using JavaScript libraries like GSAP or Anime.js for more complex animations

To center a div element, use CSS properties like display, margin, and text-align.

• Set the display property of the div element to 'block' or 'inline-block'.

• Use margin property with 'auto' value for left and right margins.

• For inline elements, use text-align property with 'center' value on the parent container.

Store in React is a centralized state management system.

• Store holds the state of the application.

• It allows components to access and update the state.

• Redux is a popular store implementation for React.

• Context API is another built-in store in React.

• Store helps in managing complex state and makes debugging easier.

Destructuring is a way to extract values from arrays or objects and assign them to variables.

• Destructuring can be used with arrays and objects

• It allows you to extract values and assign them to variables in a single line of code

• You can also use default values and rename variables during destructuring

• Example: const [a, b] = [1, 2]; // a = 1, b = 2

• Example: const {name, age: years} = {name: 'John', age: 30}; // name = 'John', years = 30

HTML is a markup language used for creating the structure of web pages.

• HTML stands for HyperText Markup Language

• It is used to create the structure of web pages by using tags

• Tags are enclosed in angle brackets, like <tag>

• Example: <h1>This is a heading</h1>

Promises are used in JavaScript to handle asynchronous operations and avoid callback hell.

• Promises are used to handle asynchronous operations in a more readable and manageable way.

• They help avoid callback hell by chaining multiple asynchronous operations together.

• Promises can be in one of three states: pending, fulfilled, or rejected.

• They allow for better error handling with the use of .catch() method.

• Promises can be created using the new Promise() constructor or by using uti...read more

Flexbox is a one-dimensional layout while Grid is a two-dimensional layout.

• Flexbox is best for arranging items in a single row or column

• Grid is best for arranging items in rows and columns

• Flexbox has a main axis and a cross axis

• Grid has rows and columns that intersect to create cells

• Flexbox is great for responsive design

• Grid allows for more complex layouts

• Flexbox is supported by older browsers

• Grid has better browser support in modern browsers

Modules in AEM are reusable components that can be used to build web pages and applications.

• Modules in AEM are reusable components that can be used to build web pages and applications.

• They help in organizing and structuring content in AEM.

• Modules can be created using Adobe Experience Manager's component framework.

• Examples of modules in AEM include header, footer, carousel, and navigation components.

Angular is a complete rewrite of AngularJS with improved performance and features.

• AngularJS is an older version of Angular

• Angular uses TypeScript while AngularJS uses JavaScript

• Angular has a more component-based architecture

• Angular has better performance and improved features compared to AngularJS

I specialize in HTML, CSS, and JavaScript for frontend development.

• Proficient in HTML for structuring web pages

• Skilled in CSS for styling and layout

• Experienced in JavaScript for interactivity and functionality

Bootstrap is a popular front-end framework used for building responsive and mobile-first websites.

• Bootstrap provides a set of CSS and JavaScript components that can be easily integrated into web projects.

• It includes a responsive grid system, pre-styled components, and a wide range of utility classes.

• Bootstrap also offers a variety of customizable themes and templates.

• It simplifies the process of creating consistent and visually appealing web interfaces.

• Example: Using the 'con...read more

HTML stands for HyperText Markup Language and CSS stands for Cascading Style Sheets.

• HTML is used for creating the structure of a webpage

• CSS is used for styling the elements on a webpage

• Both HTML and CSS are essential for web development

CSS3 is the latest version of CSS with new features and enhancements.

• CSS3 introduced new selectors like :nth-child() and :nth-of-type().

• CSS3 added new properties like border-radius and box-shadow.

• CSS3 introduced media queries for responsive design.

• CSS3 supports animations and transitions with @keyframes and transition properties.

HTML is the standard markup language for creating web pages, while HTML5 is the latest version with new features and improvements.

• HTML is the basic version used for creating web pages.

• HTML5 is the latest version with new elements, attributes, and APIs.

• HTML5 supports multimedia elements like <video> and <audio> tags.

• HTML5 introduces new form input types like email, date, and range.

JCR stands for Java Content Repository, a hierarchical database used in Adobe Experience Manager (AEM) to store content.

• JCR is used in AEM to store content in a hierarchical structure.

• It allows for versioning, access control, and searching of content.

• Nodes and properties are used to represent content in JCR.

• Example: /content/mysite/homepage is a node in JCR representing the homepage of a website.

Angular is a platform for building mobile and desktop web applications using TypeScript and HTML.

• Angular uses components as the basic building blocks of the application.

• Data binding in Angular allows for synchronization between the model and the view.

• Services in Angular are used for business logic and can be injected into components.

• Angular's dependency injection system helps manage service instances efficiently.

• Routing in Angular enables navigation between different views or...read more

Create a page that moves

• Use CSS animations or transitions to create movement

• Consider using JavaScript for more complex animations

• Experiment with different types of movement such as sliding, fading, or rotating

Developed a responsive e-commerce website for a clothing brand

• Used HTML, CSS, and JavaScript to create the front end

• Implemented a user-friendly interface with smooth navigation

• Integrated payment gateway for secure transactions

• Optimized website for mobile devices for better user experience