50+ 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

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

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

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

GET retrieves data from a server, while POST sends data to be processed. They differ in usage, security, and data handling.

• GET method appends data to the URL, e.g., /submit?name=John&age=30.

• POST method sends data in the request body, e.g., using a form submission.

• GET requests can be cached and bookmarked, while POST requests cannot.

• GET has a size limitation (around 2048 characters), while POST can handle larger amounts of data.

• GET is less secure as data is visible in the URL,...read more

PHP processes form data using $_POST and $_GET superglobals for handling user input from HTML forms.

• PHP uses $_POST to collect data sent via HTTP POST method, e.g., <form method='post'>.

• Example: $name = $_POST['name']; retrieves the value of the 'name' field.

• PHP uses $_GET to collect data sent via HTTP GET method, e.g., <form method='get'>.

• Example: $id = $_GET['id']; retrieves the value of the 'id' parameter from the URL.

• $_POST is used for sensitive data as it doesn't expose ...read more

Sessions in PHP store user data on the server, while cookies store data on the client's browser.

• Sessions are stored on the server, making them more secure than cookies.

• Cookies are stored on the client's browser and can be accessed by the user.

• Session data is temporary and lasts until the user closes the browser or logs out.

• Cookies can have an expiration date and persist even after the browser is closed.

• Example: Use sessions to track user login status; use cookies to remember ...read more

Frameworks like VueJS and ReactJS enhance web development with efficiency, reusability, and a strong community support.

• Component-based architecture promotes reusability and easier maintenance.

• Virtual DOM improves performance by minimizing direct DOM manipulations.

• Strong community support provides extensive libraries and resources.

• Reactive data binding simplifies state management and UI updates.

• Ecosystem of tools (like Vue Router, React Router) enhances functionality.

A server is a system that processes requests from clients and communicates data to the frontend, enabling web applications.

• A server is a computer or program that provides data to other computers, known as clients.

• Communication typically occurs over the internet using protocols like HTTP/HTTPS.

• When a user accesses a website, their browser (frontend) sends a request to the server.

• The server processes the request, retrieves the necessary data (e.g., from a database), and sends a...read more

A well-organized project folder enhances collaboration and maintainability in web development.

• Root folder: Contains all project files and subfolders.

• src/: Main source code folder for HTML, CSS, and JavaScript files.

• assets/: Contains images, fonts, and other media files.

• components/: Reusable UI components, especially in frameworks like React.

• styles/: CSS or SCSS files for styling the application.

• tests/: Unit and integration tests for the application.

• dist/: Compiled and minifie...read more

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

Loops in programming allow for repeated execution of code, enabling efficient handling of repetitive tasks.

• Loops help automate repetitive tasks, reducing code redundancy.

• For example, a 'for' loop can iterate through an array: for (let i = 0; i < array.length; i++) { console.log(array[i]); }

• They can control the flow of execution based on conditions, like 'while' loops: while (condition) { // code }

• Loops can be nested, allowing complex iterations, such as iterating through a 2D...read more

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.

Data can be shared between components using props, events, and a centralized store like Vuex.

• Props: pass data from parent to child components

• Events: emit events from child to parent components

• Vuex: a centralized store for managing state across components

• Provide/Inject: share data between deeply nested components

• Local storage: store data in the browser's local storage for access across components

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.

In PHP, == checks for value equality, while === checks for both value and type equality.

• == compares values after type juggling. Example: 5 == '5' returns true.

• === checks both value and type. Example: 5 === '5' returns false.

• Use == for loose comparisons and === for strict comparisons to avoid unexpected results.

• Type juggling can lead to bugs; prefer === for clarity and safety.

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

GET and POST are HTTP methods used for sending data to a server. GET appends data to the URL while POST sends data in the body of the request.

• GET method is used to request data from a specified resource. Data is sent in the URL as key-value pairs.

• POST method is used to submit data to be processed to a specified resource. Data is sent in the body of the request.

• GET requests are cached by the browser, can be bookmarked, and have length restrictions.

• POST requests are not cached,...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.

The '==' operator checks for equality of value, while the '===' operator checks for equality of value and type.

• Use '==' for loose equality comparison

• Use '===' for strict equality comparison

• Example: 1 == '1' will return true with '==', but false with '==='

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

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');

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.

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