30+ Junior Web Developer Interview Questions and Answers

Operational tasks for maintaining efficiency and quality include regular testing, monitoring performance, updating software, and implementing best practices.

• Regularly test website functionality to ensure it is working properly

• Monitor website performance metrics such as load times and user experience

• Update software and plugins to the latest versions to prevent security vulnerabilities

• Implement best practices for coding, design, and SEO to improve website quality

Threads are lighter weight than processes, share memory space, and are more efficient for multitasking.

• Threads share the same memory space, making communication between them faster and more efficient.

• Threads are lighter weight than processes, as they share resources such as memory and file descriptors.

• Threads are more efficient for multitasking, as they can run concurrently within the same process.

• Threads are easier to create and manage compared to processes, reducing overhea...read more

The Entity-Relationship (ER) model is a data model used to describe the relationships between entities in a database.

• Entities are objects or concepts in the real world that can be distinguished from each other.

• Relationships describe how entities are related to each other.

• Attributes are properties that describe entities and relationships.

• ER diagrams visually represent the ER model, showing entities, relationships, and attributes.

• Example: In a library database, 'Book' and 'Auth...read more

Angular supports two types of forms: Template-driven and Reactive-driven forms.

• Template-driven forms rely on directives in the template to create and manipulate the form controls

• Reactive-driven forms are model-driven forms that are created programmatically in the component class

• Template-driven forms are easier to use and require less code, but Reactive-driven forms offer more flexibility and control

• Both types of forms use the FormsModule and ReactiveFormsModule modules respec...read more

By creating a positive work environment, offering growth opportunities, and implementing employee recognition programs.

• Creating a positive work environment through open communication and support

• Offering growth opportunities such as training programs and career advancement

• Implementing employee recognition programs to acknowledge and reward hard work

• Providing competitive salaries and benefits to attract and retain top talent

SEO stands for Search Engine Optimization. It is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.

• Popular tools for SEO include Google Analytics for tracking website traffic and performance, SEMrush for keyword research and competitive analysis, Moz for SEO insights and link building, Ahrefs for backlink analysis and keyword tracking, and Yoast SEO for on-page optimization.

• Google Analytics helps track website...read more

Real-time operating systems are designed to provide predictable response times and prioritize tasks based on timing constraints.

• Real-time operating systems prioritize tasks based on timing constraints

• They are designed to provide predictable response times

• Examples include VxWorks, QNX, and FreeRTOS

display block takes up full width, display inline only takes up as much width as necessary

• display block elements start on a new line and take up the full width available

• display inline elements do not start on a new line and only take up as much width as necessary

• display block elements can have margin and padding applied to all four sides, while display inline elements only have left and right margin and padding by default

To grow industry and make a contribution, one must stay updated with latest technologies, collaborate with peers, and actively participate in community events.

• Stay updated with latest technologies and trends in the industry

• Collaborate with peers and share knowledge and ideas

• Actively participate in community events and contribute to open source projects

• Network with industry professionals and attend conferences and workshops

• Take initiative and propose innovative ideas to improv...read more

Optimize images, minify CSS and JS, enable caching, reduce server response time, use CDN.

• Optimize images by compressing and resizing them.

• Minify CSS and JS files to reduce their size.

• Enable caching to store static resources locally.

• Reduce server response time by optimizing code and database queries.

• Use Content Delivery Network (CDN) to distribute content geographically.

Closure is a function that has access to its own scope, even after the function has closed.

• Closure allows a function to access and manipulate variables from its outer scope.

• Use closure when you want to create private variables or functions that are only accessible within a specific scope.

• Example: Creating a counter function using closure to maintain the count state.

Observables and promises are both used for handling asynchronous operations in JavaScript.

• Promises are used to handle a single asynchronous operation and provide a way to handle success or failure of that operation.

• Observables are used to handle multiple asynchronous operations and provide a way to handle streams of data over time.

• Promises have a single value while observables can have multiple values over time.

• Observables can be cancelled while promises cannot be cancelled o...read more

Web development is the process of creating websites and web applications.

• It involves designing, coding, and maintaining websites.

• Web development can be divided into front-end and back-end development.

• Front-end development deals with the user interface and user experience.

• Back-end development deals with the server-side programming and database management.

• Examples of web development technologies include HTML, CSS, JavaScript, PHP, and MySQL.

ActiveRoute is a routing library for Vue.js applications.

• ActiveRoute allows for dynamic routing in Vue.js applications

• It can be used to create routes based on user input or other factors

• ActiveRoute can also be used to create nested routes and handle route parameters

CDN stands for Content Delivery Network. It is a network of servers distributed geographically to deliver web content efficiently.

• CDN helps to reduce latency by serving content from servers closer to the user's location.

• It improves website performance by caching static content like images, CSS, and JavaScript.

• Popular CDN providers include Cloudflare, Akamai, and Amazon CloudFront.

Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.

• Promises help to handle asynchronous operations in a more organized and readable way.

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

• Promises can be chained together using .then() to handle success and .catch() to handle errors.

• Example: const myPromise = new Promise((resolve, reject) => { ... });

Table based data binding with fake api involves displaying data in a table format using a fake api for testing purposes.

• Use a fake api to simulate real data for testing and development

• Bind the data to a table using a data binding library like Angular or React

• Display the data in rows and columns with appropriate headers and formatting

Functional component is a type of component in React that is defined as a JavaScript function.

• Functional components are simpler and easier to read compared to class components.

• They are stateless and do not have access to lifecycle methods.

• Functional components can be used with hooks to manage state and side effects.

• Example: const MyComponent = () => { return

  Hello World!
  ; }

I have experience working with React, Angular, and Vue.js frameworks.

• Worked on React for building interactive user interfaces

• Used Angular for creating dynamic web applications

• Familiar with Vue.js for developing single-page applications

Hooks in WordPress are functions that allow developers to modify or add functionality to WordPress without modifying core files.

• Hooks can be actions or filters.

• Actions are triggered at specific points in the WordPress execution process.

• Filters allow data to be modified before it is displayed on the site.

• Example: add_action('wp_head', 'my_function');

• Example: add_filter('the_content', 'my_function');

Referential integrity ensures that relationships between tables in a database remain consistent.

• It is a database concept that ensures that foreign key values in one table match the primary key values in another table.

• It prevents orphaned records in a database.

• It is enforced through constraints such as foreign key constraints.

• It helps maintain data accuracy and consistency in a database.

Route guard is a feature in Angular that allows to control access to certain routes based on user authentication and authorization.

• Route guard is implemented as a service in Angular.

• It can be used to prevent unauthorized access to certain routes.

• There are three types of route guards: CanActivate, CanActivateChild, and CanLoad.

• CanActivate is used to protect individual routes, CanActivateChild is used to protect child routes, and CanLoad is used to prevent lazy-loaded modules f...read more

HTTP is unsecured while HTTPS is secured with SSL/TLS encryption.

• HTTP stands for Hypertext Transfer Protocol while HTTPS stands for Hypertext Transfer Protocol Secure.

• HTTP operates on port 80 while HTTPS operates on port 443.

• HTTP is vulnerable to attacks while HTTPS is secure due to SSL/TLS encryption.

• HTTPS is indicated by a padlock icon in the browser's address bar.

• HTTPS is used for secure online transactions such as online banking, e-commerce, etc.

Override CSS by using !important, specificity, or inline styles.

• Use !important to override specific CSS rules

• Increase specificity of selectors to override styles

• Use inline styles directly in HTML elements

Session in PHP is a way to store information (variables) to be used across multiple pages during a user's visit to a website.

• Sessions are used to store user-specific information, such as username, shopping cart items, etc.

• Sessions are started with session_start() function and can be accessed using the $_SESSION superglobal array.

• Sessions are stored on the server and identified by a unique session ID, which is usually stored in a cookie on the user's browser.

Props are a way to pass data from a parent component to a child component in React.

• Props are read-only and cannot be modified by the child component.

• Props are passed down from parent to child components through attributes.

• Props can be any type of data, including strings, numbers, arrays, objects, or functions.

• Example: <ChildComponent name='John' age={25} />

To solve a problem, it is important to first identify the root cause and then come up with a plan of action to address it.

• Identify the problem by gathering information and analyzing the situation

• Break down the problem into smaller components to better understand it

• Brainstorm possible solutions and evaluate their feasibility

• Implement the chosen solution and monitor its effectiveness

• Adjust the solution as needed based on feedback and results

Indian Railways is a state-owned national railway system in India, operating one of the largest and busiest rail networks in the world.

• Indian Railways is managed by the Ministry of Railways, Government of India.

• It is responsible for rail transport in India, covering over 67,000 km of track and carrying millions of passengers daily.

• Indian Railways operates both long-distance and suburban rail systems, connecting various parts of the country.

• It is known for its extensive networ...read more

HTML5 tags are elements used to structure and format content on a web page.

• HTML5 tags are used to define different parts of a webpage, such as headings, paragraphs, images, links, etc.

• Some common HTML5 tags include <div>, <p>, <h1> to <h6>, <img>, <a>, <ul>, <li>, <table>, <form>, etc.

• HTML5 tags are enclosed in angle brackets <> and usually come in pairs - an opening tag and a closing tag.

WordPress is a popular content management system (CMS) used for creating websites and blogs.

• WordPress is open-source software, meaning it is free to use and modify.

• It is known for its user-friendly interface and customizable themes and plugins.

• WordPress powers over 35% of all websites on the internet, including blogs, e-commerce sites, and more.

React JS is a JavaScript library for building user interfaces.

• Declarative: React makes it easy to create interactive UIs by breaking them into reusable components.

• Virtual DOM: React uses a virtual DOM to improve performance by only updating the necessary parts of the actual DOM.

• Component-based: React follows a component-based architecture, where each component manages its own state.

HOC (Higher Order Component) in Reactjs is a pattern where a function takes a component and returns a new component.

• HOC allows code reuse, logic abstraction, and props manipulation in React components.

• Example: withAuth HOC can be used to restrict access to certain components based on user authentication.

• HOC can be created using a function that takes a component as an argument and returns a new component with additional props or functionality.

OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.

• OOPs focuses on creating reusable code through classes and objects

• Encapsulation: bundling data and methods that operate on the data within a single unit

• Inheritance: allows a class to inherit properties and behavior from another class

• Polymorphism: ability for objects to be treated as instances of their parent class or their own class

• Abstraction: hiding ...read more