Frontend Machine Coding Interview Questions
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Build a Basic HTML Page: Create a basic HTML page that includes a header, navigation menu, main content section, and a footer.
Responsive Navigation Menu: Implement a responsive navigation menu that collapses into a hamburger menu on smaller screens using HTML, CSS, and JavaScript/jQuery.
JavaScript Calculator: Build a simple calculator using HTML, CSS, and JavaScript that can perform basic arithmetic operations (addition, subtraction, multiplication, division).
Image Carousel: Create an image carousel/slider using HTML, CSS, and JavaScript/jQuery that allows users to navigate through a set of images with next and previous buttons.
To-Do List Application: Develop a to-do list web application using HTML, CSS, and JavaScript. Users should be able to add, edit, and delete tasks.
Responsive Design: Take an existing web page and make it responsive for various screen sizes (e.g., desktop, tablet, mobile) using media queries and CSS.
Fetch API: Use the Fetch API to retrieve data from a JSON endpoint and display it on a web page using JavaScript.
Single Page Application (SPA): Build a simple single-page application (SPA) using a frontend framework of your choice (e.g., React, Angular, Vue.js). Create multiple views and navigate between them.
Form Validation: Implement client-side form validation for a registration form using HTML5 and JavaScript. Validate fields like email, password strength, and required fields.
Implement a Drag and Drop Feature: Create a web page with a drag-and-drop interface using HTML, CSS, and JavaScript. Allow users to drag elements and drop them into designated areas.
Infinite Scroll: Implement an infinite scroll feature on a web page. Load additional content as the user scrolls down the page using JavaScript and AJAX.
Interactive Map: Build an interactive map using a mapping library (e.g., Leaflet, Google Maps API) and allow users to search for locations, add markers, and display additional information when clicking on markers.
Web Accessibility: Ensure that a web page complies with web accessibility standards (WCAG). Make necessary HTML and CSS modifications to improve accessibility for users with disabilities.
CSS Animation: Create a CSS animation, such as a spinning loader or a fading effect, to enhance user experience on a webpage.
Responsive Email Template: Design and code a responsive email template that looks good on both desktop and mobile email clients.
Dynamic Content Filtering: Create a web page that allows users to filter content dynamically based on categories or tags using JavaScript.
Social Media Sharing Buttons: Implement social media sharing buttons (e.g., Facebook, Twitter) on a webpage. When a user clicks a button, a share dialog should appear.
Image Lazy Loading: Implement image lazy loading to improve page performance. Images should only load when they are in the viewport.
Form Autocomplete: Add autocomplete functionality to a search input field using JavaScript. Provide suggestions as the user types.
Implement a Lightbox: Create a lightbox/modal window that displays images or content when a user clicks on a thumbnail or a button.
Real-time Chat Application: Build a real-time chat application using a frontend framework (e.g., React, Vue.js) and a backend technology like WebSocket or Firebase.
Responsive Tables: Make HTML tables responsive. Ensure that tables adapt to different screen sizes without horizontal scrolling.
Data Visualization: Create a data visualization chart (e.g., bar chart, pie chart) using a JavaScript library like D3.js or Chart.js.
Sticky Navigation: Implement a sticky navigation bar that sticks to the top of the page when scrolling down and returns to its original position when scrolling up.
Web Performance Optimization: Optimize the performance of a slow-loading webpage. Identify bottlenecks and apply optimizations to reduce load times.
Progressive Web App (PWA): Convert a web application into a Progressive Web App. Add features like offline access and push notifications.
Unit Testing: Write unit tests for a JavaScript function or component using a testing framework like Jest.
Cross-browser Compatibility: Ensure that a webpage works correctly and looks consistent across different web browsers (e.g., Chrome, Firefox, Edge).
Web Security: Identify and fix security vulnerabilities in a web application, such as Cross-Site Scripting (XSS) or Cross-Site Request Forgery (CSRF).
Responsive Email Signature: Design and code a responsive email signature that can be used in email clients.
Infinite Carousel: Create an infinite carousel/slider that automatically loops through a set of images or content, providing navigation controls for the user.
Image Gallery: Build an image gallery where users can view a collection of images, click to enlarge, and navigate through them using previous and next buttons.
Tooltip Component: Design and implement a reusable tooltip component in HTML, CSS, and JavaScript/jQuery that appears when hovering over specific elements.
Data Fetch and Display: Fetch data from a public API (e.g., GitHub API, OpenWeatherMap API) and display it on a webpage using JavaScript. Format and style the data appropriately.
Animated Dropdown Menu: Create a dropdown menu that expands and collapses with smooth animations when the user hovers over a trigger element.
Interactive Forms: Enhance a web form with interactive features like auto-suggestions, input validation, and conditional form fields using JavaScript.
Page Transitions: Implement smooth page transitions between different sections or pages of a website using CSS transitions and JavaScript.
Keyboard Shortcuts: Add keyboard shortcuts to a web application to improve user accessibility and navigation.
Dark Mode Toggle: Create a dark mode toggle button that switches the website's color scheme between light and dark mode.
WebGL Experiment: Develop an interactive WebGL project, such as a 3D visualization or animation, and embed it into a webpage.
Custom Video Player: Build a custom HTML5 video player with custom controls, such as play, pause, volume, and progress bar.
Page Printing Styles: Define CSS styles for printing a web page so that it looks well-formatted when printed on paper.
Implement a Photo Gallery: Create a photo gallery with albums, thumbnails, and the ability to view images in a larger size.
Web Audio Player: Build a web-based audio player with features like play, pause, volume control, and playlist support.
SVG Animation: Animate SVG graphics using CSS or JavaScript to create eye-catching visual effects.
Custom CSS Framework: Develop a custom CSS framework with pre-designed components and styles for rapid front-end development.
Web Animation Framework: Create a JavaScript animation framework that simplifies the process of animating elements on a webpage.
Augmented Reality Web App: Develop an augmented reality (AR) web application that overlays digital content on the user's real-world view using WebXR or similar technology.
Progressive Image Loading Placeholder: Implement a progressive image loading technique that displays a blurred or low-quality image as a placeholder while the high-quality image loads.
Automated Web Testing: Write automated tests for a web application using testing frameworks like Selenium or Cypress.
Custom Web Animation Library: Create a small JavaScript library for animating elements on a webpage, including support for various easing functions.
Custom UI Components: Create custom UI components, such as a modal dialog, date picker, or autocomplete, from scratch using HTML, CSS, and JavaScript.
Mobile-First Development: Develop a webpage following the mobile-first approach, ensuring it looks and functions well on mobile devices and scales up to larger screens.
Third-Party API Integration: Integrate with a third-party API (e.g., Google Maps, Twitter, YouTube) and display data or content from that API on your webpage.
Offline Support: Implement offline support for a web application, allowing users to access content even when they have no internet connection.
Browser History API: Use the Browser History API to implement client-side routing in a single-page application (SPA).
Infinite Scroll with Pagination: Combine infinite scrolling with pagination to load and display content efficiently while allowing users to navigate through pages of data.
Web Audio Player: Build a web-based audio player with features like play, pause, volume control, and playlist support.
WebGL Experiment: Develop an interactive WebGL project, such as a 3D visualization or animation, and embed it into a webpage.
Lazy-Loaded Modules: Implement lazy-loading for modules in a frontend framework (e.g., React, Angular, Vue.js) to reduce the initial bundle size.
SVG Icon Library: Create a reusable SVG icon library with a search and usage feature for easy integration into web projects.
WebGL 3D Scene: Develop a 3D scene using WebGL, including 3D models, textures, and interactive elements.
Lazy-Loaded Images: Implement lazy-loaded images that load only when they come into the user's viewport, improving page loading performance.
Web Performance Monitoring: Implement web performance monitoring and analytics to track and analyze website performance over time.
Web Security Audit: Perform a security audit on a web application and identify vulnerabilities like SQL injection, XSS, and CSRF. Suggest and implement fixes.
Server-Side Rendering (SSR) with React: Set up server-side rendering (SSR) for a React application.
WebGL Shader Effects: Build a WebGL-based shader effect, such as a water ripple effect or a dynamic particle system.
Lazy-Loaded Images: Implement lazy-loaded images that load only when they come into the user's viewport, improving page loading performance.
Web Performance Monitoring: Implement web performance monitoring and analytics to track and analyze website performance over time.
Web Security Audit: Perform a security audit on a web application and identify vulnerabilities like SQL injection, XSS, and CSRF. Suggest and implement fixes.
Server-Side Rendering (SSR): Implement server-side rendering for a frontend framework (e.g., React, Angular) to improve initial page load performance.
WebGL Shader Effects: Build a WebGL-based shader effect, such as a water ripple effect or a dynamic particle system.
Virtual DOM Implementation: Implement a simplified virtual DOM (similar to React's virtual DOM) in JavaScript.
Progressive Image Loading: Develop an image loading technique that progressively loads images, starting with low-quality placeholders and improving to high-quality images.
Touch and Gesture Events: Implement touch and gesture events in a web application to provide touch-based interactions on mobile devices.
Browser Storage Management: Build a utility for managing browser storage (localStorage, sessionStorage) and provide methods for setting, getting, and removing data.
Web Worker: Use a web worker to offload computationally intensive tasks from the main thread, improving performance.
Custom UI Components: Create custom UI components, such as a modal dialog, date picker, or autocomplete, from scratch using HTML, CSS, and JavaScript/jQuery.
Mobile-First Development: Develop a webpage following the mobile-first approach, ensuring it looks and functions well on mobile devices and scales up to larger screens.
Third-Party API Integration: Integrate with a third-party API (e.g., Google Maps, Twitter, YouTube) and display data or content from that API on your webpage.
Offline Support: Implement offline support for a web application, allowing users to access content even when they have no internet connection.
Browser Storage Encryption: Implement encryption for data stored in browser storage (e.g., localStorage) to enhance security.
WebGL Particle Animation: Create a particle animation using WebGL, simulating effects like fire, rain, or fireworks.
WebGL Data Visualization: Develop a data visualization using WebGL to represent complex datasets in an interactive 3D format.
Custom Drag and Drop: Create a custom drag-and-drop functionality for elements on a webpage without relying on external libraries.
Server-Side Rendering (SSR): Implement server-side rendering for a frontend framework (e.g., React, Angular) to improve initial page load performance.
WebGL Shader Effects: Build a WebGL-based shader effect, such as a water ripple effect or a dynamic particle system.
Virtual DOM Implementation: Implement a simplified virtual DOM (similar to React's virtual DOM) in JavaScript.
Progressive Image Loading: Develop an image loading technique that progressively loads images, starting with low-quality placeholders and improving to high-quality images.
Touch and Gesture Events: Implement touch and gesture events in a web application to provide touch-based interactions on mobile devices.
Browser Storage Management: Build a utility for managing browser storage (localStorage, sessionStorage) and provide methods for setting, getting, and removing data.
Web Worker: Use a web worker to offload computationally intensive tasks from the main thread, improving performance.
Browser Storage Encryption: Implement encryption for data stored in browser storage (e.g., localStorage) to enhance security.
WebGL Particle Animation: Create a particle animation using WebGL, simulating effects like fire, rain, or fireworks.
WebGL Data Visualization: Develop a data visualization using WebGL to represent complex datasets in an interactive 3D format.
Custom Drag and Drop: Create a custom drag-and-drop functionality for elements on a webpage without relying on external libraries.
React Component: Create a simple React component (e.g., a button or a card) and render it on a webpage.
State Management: Build a React component that manages and displays state, such as a counter that increments when a button is clicked.
Props and PropTypes: Create a React component that accepts props and uses PropTypes to define and validate the expected props.
Conditional Rendering: Implement conditional rendering in a React component based on a condition like user authentication.
Handling Events: Add event handlers to React components (e.g., onClick, onChange) to make them interactive.
Component Lifecycle: Utilize component lifecycle methods (e.g., componentDidMount, componentDidUpdate) in a React component.
Forms in React: Create a form in a React component and manage its state as users input data.
React Router: Set up routing in a React application using React Router, with multiple routes and navigation.
API Data Fetching: Fetch data from an API in a React component and display it.
Context API: Use React's Context API to manage and share state or data across multiple components.
Redux Setup: Set up a Redux store, actions, and reducers in a React application.
Redux State Management: Implement state management with Redux, connecting React components to the Redux store.
Redux Middleware: Use Redux middleware (e.g., Thunk) to handle asynchronous actions in a Redux-powered React application.
Authentication Flow: Implement user authentication and authorization in a React application, including login and protected routes.
React Hooks: Rewrite class-based React components into functional components using hooks like useState and useEffect.
Redux Saga: Integrate Redux Saga for handling side effects (e.g., API calls) in a Redux-based React application.
React Higher-Order Components (HOCs): Create a higher-order component (HOC) to add functionality to existing React components.
Error Handling: Implement error handling and display error messages in a React application.
Optimizing Performance: Optimize the performance of a React application by reducing unnecessary renders and using memoization.
Unit Testing with React Testing Library: Write unit tests for React components using React Testing Library and Jest.
Server-Side Rendering (SSR) with React: Set up server-side rendering (SSR) for a React application.
Progressive Web App (PWA) with React: Convert a React application into a Progressive Web App with offline support.
Internationalization (i18n): Implement internationalization and localization in a React application.
React Animation: Add animations and transitions to React components using libraries like React Spring or Framer Motion.
Data Pagination: Implement data pagination in a React application, fetching and displaying data in chunks.
Real-time Updates: Enable real-time updates in a React application using WebSocket or a similar technology.
Authentication with OAuth: Implement OAuth-based authentication (e.g., OAuth 2.0) in a React application.
Testing React Hooks: Write unit tests for custom React hooks using React Testing Library and Jest.
Custom React Router: Build a custom router using React Router's low-level APIs to gain a deeper understanding of routing.
Redux Store: Create a Redux store and define actions and reducers to manage state.
Redux Actions and Reducers: Implement Redux actions and reducers to handle specific features or data in a Redux store.
Redux Middleware: Add custom middleware to a Redux store to intercept and modify actions.
Redux Thunk: Use Redux Thunk middleware to handle asynchronous actions in a Redux store.
Redux Saga: Set up Redux Saga to manage side effects, such as API calls, in a Redux-powered application.
Redux State Normalization: Normalize the shape of the Redux store to efficiently manage relational data.
Redux Selector Functions: Create selector functions in a Redux application to efficiently retrieve and compute the derived state.
Redux Immutable State: Ensure that the Redux store's state remains immutable to prevent unintended mutations.
Redux Persistence: Implement state persistence in a Redux application, allowing the state to be saved and restored across sessions.
Redux Testing: Write unit tests for Redux actions, reducers, and selectors using testing libraries like Jest.
Redux Middleware Testing: Test Redux middleware, such as Thunk or Saga, to ensure correct behavior.
Redux DevTools: Integrate and use Redux DevTools to inspect and debug the Redux store.
Redux Integration with React: Connect a React application to a Redux store, dispatch actions, and map state to props.
Redux Integration with Angular: Integrate Redux with an Angular application using libraries like NgRx.
Redux Integration with Vue.js: Integrate Redux with a Vue.js application using libraries like Vuex.
Angular Component: Create a simple Angular component and display it in a template.
Angular Template Syntax: Use Angular's template syntax to render dynamic content and data.
Angular Two-Way Binding: Implement two-way data binding in Angular to synchronize data between a component and its template.
Angular Directives: Use built-in and custom Angular directives to manipulate the DOM and control rendering.
Angular Services: Create and use Angular services to share data and logic across components.
Angular Dependency Injection: Apply dependency injection in Angular to inject services into components.
Angular Routing: Set up routing in an Angular application with multiple views and navigation.
Angular Forms: Build forms in Angular, including template-driven and reactive forms.
HTTP Requests in Angular: Make HTTP requests to retrieve data from an API in an Angular application.
Angular Observables: Use observables and the RxJS library to work with asynchronous data in Angular.
Angular Pipes: Create custom pipes in Angular to transform and format data in templates.
Angular Directives: Develop custom Angular directives to add behavior and interactivity to elements.
Angular Modules: Organize an Angular application into feature modules to improve maintainability.
Angular Animation: Implement animations and transitions in Angular components using Angular's animation features.
Unit Testing in Angular: Write unit tests for Angular components, services, and pipes using testing frameworks like Jasmine and Karma.
End-to-End Testing in Angular: Perform end-to-end (E2E) testing of an Angular application using tools like Protractor.
Angular Routing Guards: Create routing guards in Angular to control access to routes based on conditions like authentication.
Angular Interceptors: Implement interceptors in Angular to add global error handling, logging, or authentication to HTTP requests.
Server-Side Rendering (SSR) with Angular: Set up server-side rendering (SSR) for an Angular application.
Angular Internationalization (i18n): Implement internationalization and localization in an Angular application.
Angular Lazy Loading: Optimize an Angular application by lazy-loading feature modules.
Angular Custom Forms: Create custom form controls and validators in Angular for complex form scenarios.
Angular Testing Best Practices: Apply best practices for testing Angular applications, including component testing and mocking dependencies.
Angular Material: Integrate and use Angular Material components and styles in an Angular application.
Angular State Management: Implement state management in an Angular application using libraries like NgRx.
Vue.js Instance: Create a Vue.js instance and render data in a template.
Vue.js Data Binding: Implement data binding in Vue.js to update the UI based on changes in data.
Vue.js Directives: Use Vue.js directives to manipulate the DOM and add behavior to templates.
Vue.js Components: Create Vue.js components and pass data between parent and child components.
Vue.js Event Handling: Handle user events in Vue.js components and trigger actions.
Vue.js Forms: Build forms in Vue.js and manage form data using directives and methods.
Vue.js Routing: Set up routing in a Vue.js application with multiple views and navigation.
Vue.js State Management: Manage application state in Vue.js using Vuex.
Vue.js HTTP Requests: Make HTTP requests to fetch data from an API in a Vue.js application.
Vue.js Lifecycle Hooks: Utilize Vue.js lifecycle hooks to perform actions at different stages of a component's lifecycle.
Vue.js Custom Directives: Create custom directives in Vue.js to extend functionality.
Vue.js Filters: Define and use custom filters in Vue.js to format and transform data in templates.
Vue.js Transitions and Animations: Add transitions and animations to Vue.js components for smooth UI effects.
Vue.js Unit Testing: Write unit tests for Vue.js components using testing libraries like Jest.
Vue.js End-to-End Testing: Perform end-to-end (E2E) testing of a Vue.js application using tools like Cypress.
Vue.js Routing Guards: Create routing guards in Vue.js to control access to routes based on conditions like authentication.
Vue.js Server-Side Rendering (SSR): Set up server-side rendering (SSR) for a Vue.js application.
Vue.js Internationalization (i18n): Implement internationalization and localization in a Vue.js application.
Vue.js Lazy Loading: Optimize a Vue.js application by lazy-loading components and routes.
Vue.js Composition API: Develop components using the Vue.js Composition API for more flexible and reusable code.
Vue.js Custom Directives: Create custom directives in Vue.js to extend functionality.
Vue.js Filters: Define and use custom filters in Vue.js to format and transform data in templates.
Vue.js Transitions and Animations: Add transitions and animations to Vue.js components for smooth UI effects.
Vue.js Unit Testing: Write unit tests for Vue.js components using testing libraries like Jest.
Vue.js End-to-End Testing: Perform end-to-end (E2E) testing of a Vue.js application using tools like Cypress.
Vue.js Routing Guards: Create routing guards in Vue.js to control access to routes based on conditions like authentication.
Vue.js Server-Side Rendering (SSR): Set up server-side rendering (SSR) for a Vue.js application.
Vue.js Internationalization (i18n): Implement internationalization and localization in a Vue.js application.
Vue.js Lazy Loading: Optimize a Vue.js application by lazy-loading components and routes.
Vue.js Composition API: Develop components using the Vue.js Composition API for more flexible and reusable code.
