Frontend Machine Coding Interview Questions in React JS
Here are the 30 Most Asked Frontend Machine Coding Interview Questions in React JS including the common features to implement and key features to cover. Also includes the Advance or optional tags for features.
Beginner Level Machine Coding Questions
1. Increment/Decrement Counter
A basic counter component that allows users to increase or decrease a numeric value by clicking buttons.More Resources
Common Features To Implement:
- Simple increment and decrement buttons
- Display of the current count value
- Prevent count from going negative (optional)
- Ability to reset counter (optional)
- Custom step size (e.g., increment/decrement by more than 1)
- Button disabled state when minimum/maximum limits reached
- State lifting (parent manages value; pass as prop)
- Unit/integration testing of increment/decrement logic
- React useState for state management
- Event handling in React (onClick)
- Component props and default props
- Conditional rendering and button disabling
- Component composition and reusability
- Type checking with PropTypes or TypeScript (optional)
- Accessibility basics (ARIA labels, roles, keyboard nav)
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A flexible grid layout component that adapts to different screen sizes, organizing content in responsive columns with customizable spacing and breakpoints.More Resources
Common Features To Implement:
- Grid layout that adapts to various screen sizes with Responsive breakpoints (mobile, tablet, desktop)
- Customizable number of columns
- Support for both fixed and fluid grid containers
- Accessibility: Proper aria roles and keyboard navigation
- Unit/integration testing for layout logic and reflow
- CSS Grid and/or Flexbox basics in React
- Passing layout settings as props (columns, gap, breakpoints)
- Conditional classNames or inline styles based on props/screen size
- Mapping over collections to create grid items
- Reusability via generic Grid and GridItem components
- Accessibility and semantic HTML for grids (e.g., role="grid")
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A timer component that counts down from a target date/time or duration, displaying the remaining time in days, hours, minutes, and seconds with real-time updates.View more resources on FrontendGeek
Common Features To Implement:
- Set target date/time or duration for countdown
- Display days, hours, minutes, and seconds remaining
- Visual timer that updates every second
- Format time values (e.g., pad single digits with zero)
- Pause/resume functionality (optional)
- Reset countdown to initial value
- Visual indicators when countdown reaches zero (alerts, animations)
- Advance: Customizable display format (show/hide specific units)
- Advance: Handle timezone differences
- Unit/integration testing for time calculations
- React useState and useEffect hooks
- setInterval and clearInterval for timers (Important)
- Component cleanup in useEffect (prevent memory leaks)
- Date manipulation and time calculations
- Conditional rendering based on countdown state
- Advance: Performance optimization (avoid unnecessary re-renders)
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4. Accordion (Static or Dynamic)
A collapsible content component that allows users to expand and collapse multiple sections, commonly used for FAQs, menus, or grouped information displays.More Resources
Common Features To Implement:
- Multiple collapsible sections with headers
- Expand/collapse on header(icon) click
- Extra: Smooth animations for opening/closing
- Single or multiple sections open at once (accordion vs. multi-select)
- Icons indicating open/closed state (chevrons, plus/minus)
- Extra: Accessibility: ARIA attributes (aria-expanded, aria-controls)
- Extra: Keyboard navigation support (Enter, Space, Arrow keys)
- Advance: Disable specific accordion items
- Advance: Dynamic content rendering (fetch data on expand)
- Advance: Nested accordions (optional)
- Unit/integration testing for expand/collapse logic
- React state management for tracking open/closed items - useState()
- Conditional rendering and CSS transitions/animations
- Event delegation and click handling
- Props drilling or context for nested components
- Controlled vs. uncontrolled components
- CSS classes and inline styles for animations
- Accessibility: ARIA attributes and keyboard events
- Component composition (Accordion, AccordionItem, AccordionHeader)
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5. Responsive Menu/Nav Bar
A navigation component that transforms from a horizontal menu on desktop to a hamburger menu on mobile devices with active route highlighting (Smooth animation if required).
More Resources
Common Features To Implement:
- Horizontal navigation menu on desktop
- Hamburger menu icon on mobile/tablet
- Slide-in or dropdown menu for mobile view
- Active route/state highlighting
- Logo and branding elements
- Close button in mobile menu
- Smooth transitions and animations
- Responsive breakpoints (mobile-first approach)
- Submenu/nested navigation support
- Click outside to close mobile menu
- Advance: Sticky/fixed navbar option
- Advance: Keyboard navigation and focus management
- Accessibility: ARIA labels, roles, keyboard shortcuts
- CSS media queries and responsive design
- React useState for menu open/closed state
- Conditional rendering based on screen size (useWindowSize hook)
- Event handlers for click outside detection
- CSS transitions and transforms for animations
- Flexbox for layout (Important)
- Router integration (activeLink styling)
- Overlay/modal-like menus (optional)
- Accessibility: focus trapping, ARIA attributes
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6. E-Comm Catalog View (Dynamic from API)
A product catalog component that displays items fetched from an API, with filtering, sorting, search, and pagination capabilities for e-commerce applications.
More Resources: View detailed guide on FrontendGeek
Common Features To Implement:
- Display product grid/list from API data
- Loading states and skeleton screens
- Error handling and retry mechanisms
- Product image, title, price, and description
- Sorting options (price, name, rating, popularity)
- Filtering by category, price range, brand
- Search functionality
- Responsive grid layout (2-4 columns based on screen)
- Product detail modal or navigation
- Empty state when no products match filters
- Advance: Pagination or infinite scroll
- Optional: Add to cart functionality
- Advance: URL state management (preserve filters in URL)
- Fetch API for API calls
- React useEffect for data fetching
- Loading, error, and success states
- Array methods: filter, sort, map
- Controlled inputs for search and filters
- State management for filters, sort, and pagination
- Memoization with useMemo for filtered/sorted lists
- Component composition (ProductCard, FilterBar, SortDropdown)
- Error boundaries (optional)
- Debouncing search input (optional)
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Intermediate Level Machine Coding Questions
A task management application that allows users to add, edit, delete, and filter todo items, with persistence and keyboard shortcuts support.More Resources on FrontendGeek
Common Features To Implement:
- Add new todo items
- Mark todos as complete/incomplete
- Delete individual todos
- Edit existing todos (inline editing)
- Filter todos (All, Active, Completed)
- Clear all completed todos
- Toggle all todos complete
- Persist todos (localStorage or API)
- Count of active todos
- Optional: Keyboard shortcuts (Enter to add, Escape to cancel)
- Advance: Drag and drop to reorder
- Advance: Due dates and priorities
- Accessibility: ARIA labels, keyboard navigation
- CRUD operations in React
- Complex state management (useState with arrays/objects)
- Array manipulation (add, update, delete, filter)
- Controlled inputs and forms
- localStorage for persistence
- Unique ID generation (UUID or timestamp)
- Conditional rendering for filters
- Component composition (TodoItem, TodoList, TodoForm)
- State lifting and prop drilling
- Custom hooks for todo logic (optional)
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8. News Feed / Infinite Scrolling
A feed component that automatically loads more content as users scroll, displaying posts with engagement features and infinite scrolling.More Resources
Common Features To Implement:
- fetch API to Load and display feed items
- Automatic loading when user scrolls near bottom or react to bottom
- Loading indicators (spinner, skeleton)
- Virtualization: Virtual scrolling for large lists
- Error handling and retry
- Image lazy loading
- Optional: Click to view full post
- Advance: Infinite scroll threshold customization
- useEffect and useRef for scroll detection
- Intersection Observer API or scroll event listeners
- API pagination (offset/limit or cursor-based)
- Managing paginated state (page, hasMore, loading)
- Performance: memoization with React.memo and useMemo
- Debouncing scroll events
- Cleanup of event listeners and observers
- Optimistic UI updates
- Error boundaries and error states
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9. Pagination Implementation
A pagination component that allows users to navigate through large datasets by displaying page numbers with prev/next controls and ellipsis for large page ranges.More Resources on FrontendGeek
Common Features To Implement:
- Display page numbers or prev/next buttons
- Jump to first/last page
- Current page highlighting
- Items per page selector
- Total items count display
- URL synchronization (page in query params)
- Keyboard navigation (arrow keys)
- Disable prev/next at boundaries
- Responsive design (fewer page numbers on mobile)
- Loading state during page transitions
- Optional: Ellipsis for large page ranges
- Calculating total pages from total items and items per page
- Array slicing for current page data
- State management for current page and items per page
- Generating page number arrays with ellipsis logic
- URLSearchParams for URL state management
- Conditional rendering for page numbers
- Event handling for page navigation
- Memoization for page calculations
- Accessible pagination (ARIA labels, keyboard events)
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10. Auto-Complete Search / Type-Ahead Search
A search component that provides real-time suggestions as users type, with debounced API calls, keyboard navigation, and highlighted matching text.View detailed guide on FrontendGeek
Common Features To Implement:
- Search input field
- Dropdown suggestions list
- Highlight matching text in suggestions
- Keyboard navigation (Arrow keys, Enter, Escape)
- Debounced API calls
- Loading state during search
- Empty state when no results
- Click outside to close dropdown
- Recent searches (localStorage)
- Minimum character threshold before searching
- Show/hide dropdown based on focus and results
- Controlled input component
- Debouncing user input (useDebounce hook or custom)
- API calls with fetch or axios
- Handling async operations and race conditions
- Managing dropdown open/closed state
- Highlighting text matches (using regex)
- Keyboard event handling (onKeyDown)
- Click outside detection (useRef, useEffect)
- Advance: AbortController for canceling requests
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An interactive rating component with clickable stars that allows users to select and display ratin.More Resources on FrontendGeek
Common Features To Implement:
- Clickable stars (1-5 rating)
- Hover effect to preview rating
- Display current rating
- Read-only mode
- Show rating value (example - "4.2 out of 5")
- Customizable number of stars
- Advance: Size variants (small, medium, large)
- Accessibility: ARIA attributes, keyboard navigation
- Advance: Half-star ratings
- Managing rating state (useState)
- Mouse events (onClick, onMouseEnter, onMouseLeave)
- Conditional rendering of filled/empty/half stars
- Props for controlled/uncontrolled components
- Inline styles or CSS classes for star colors
- Array methods to generate star elements
- Calculating fill percentage for visual representation
- Event handlers for hover and click interactions
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A slideshow component that displays multiple images sequentially with navigation controls, auto-play functionality, and smooth transitions between images.
Common Features To Implement:
- Display multiple images in sequence
- Previous/Next navigation buttons
- Dot indicators showing current image
- Smooth transitions (fade, slide)
- Keyboard navigation (Arrow keys)
- Lazy loading images
- Advance: Auto-play with pause on hover
- Advance: Infinite loop (wrap around)
- Advance: Fullscreen mode (optional)
- Advance: Responsive image sizing
- useState for current image index
- useEffect with setInterval for auto-play
- Cleanup intervals on unmount
- Array manipulation (increment/decrement with bounds)
- CSS transitions or transforms for animations
- Conditional rendering for indicators and navigation
- Touch event handlers (touchStart, touchEnd) for swipe
- Image optimization and lazy loading
- Keyboard event handling
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A notification system that displays temporary messages with different types (success, error, warning), auto-dismiss functionality, and stack management for multiple toasts.View detailed guide on FrontendGeek
Common Features To Implement:
- Show toast messages with different types (success, error, warning, info)
- Auto-dismiss after duration
- Manual dismiss button (X icon)
- Stack multiple toasts
- Slide-in/slide-out animations
- Customizable position (top-right, bottom-left, etc.)
- Icon or emoji per toast type
- Progress bar showing remaining time
- Pause on hover
- Queue management (limit visible toasts)
- Accessibility: ARIA live regions
- Portal for rendering outside component tree
- State management for toast queue (array of toasts)
- useEffect with timeout for auto-dismiss
- Unique ID generation for each toast
- Adding/removing toasts from queue
- CSS animations and transitions
- Context API or state management for global toast access
- Position-based styling (absolute/fixed positioning)
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14. Tab Component (Static or Dynamic)
A tabbed interface component that organizes content into multiple panels, allowing users to switch between different views with keyboard navigation support.More Resources
Common Features To Implement:
- Multiple tabs with labels
- Active tab highlighting
- Tab content panel display
- Keyboard navigation (Arrow keys, Home, End)
- Disabled tabs
- Icon support in tabs
- Lazy loading tab content (optional)
- Scrollable tabs for many items (optional)
- Vertical tabs layout (optional)
- URL hash/query for active tab (optional)
- Accessibility: ARIA tabs pattern
- State management for active tab index
- Conditional rendering of tab panels
- Array mapping to generate tabs and panels
- Keyboard event handling
- CSS for tab styling and active states
- Component composition (Tabs, TabList, Tab, TabPanel)
- Props interface design
- Controlled vs. uncontrolled component pattern
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A right-click menu component that appears at the cursor position, providing contextual actions with keyboard navigation and click-outside-to-close functionality.More Resources
Common Features To Implement:
- Right-click to show menu
- Menu items with labels and icons
- Menu positioning near cursor
- Click outside to close
- Keyboard navigation (Arrow keys, Enter, Escape)
- Disabled menu items
- Separator lines between item groups
- Nested submenus (optional)
- Animations (fade-in, slide)
- Prevent default context menu
- Accessibility: ARIA roles and keyboard support
- Event handling: onContextMenu, preventDefault
- Portal for rendering menu
- State for menu visibility and position
- Calculating menu position (mouse coordinates)
- Click outside detection
- Keyboard event handlers
- Focus management
- Positioning logic (prevent overflow outside viewport)
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16. Progress Bar Component
A visual indicator component that displays the completion status of a process, showing progress from 0-100% with animated updates and variant styles.More Resources
Common Features To Implement:
- Visual progress indicator (0-100%)
- Animated progress updates
- Label showing percentage or status text
- Different styles (linear, circular)
- Color variants (success, warning, error, info)
- Size variants (small, medium, large)
- Striped/animated pattern option
- Buffer/secondary progress (optional)
- Indeterminate mode (loading spinner)
- Accessibility: ARIA attributes (role="progressbar")
- Props for progress value (0-100)
- CSS transitions for smooth animations
- Inline styles or CSS classes for width/percentage
- Conditional styling based on progress value
- SVG for circular progress (optional)
- Component variants with props
- Accessibility: aria-valuenow, aria-valuemin, aria-valuemax
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A dialog component that overlays the main content, displaying focused information or forms with backdrop, focus trapping, and accessibility features.More Resources
Common Features To Implement:
- Overlay/backdrop
- Centered modal dialog
- Close button (X icon)
- Close on backdrop click
- Close on Escape key
- Focus trap (keep focus inside modal)
- Return focus to trigger element on close
- Modal title and body content
- Footer with action buttons
- Size variants (small, medium, large, fullscreen)
- Prevent body scroll when open
- Animation (fade-in, scale)
- Nested modals support (optional)
- Accessibility: ARIA modal pattern
- Portal for rendering outside DOM hierarchy
- State management for open/closed
- Event handlers (onClick, onKeyDown)
- Focus management and focus trap
- CSS for overlay and modal positioning
- Body scroll lock
- Component composition (Modal, ModalHeader, ModalBody, ModalFooter)
- Context API for modal state (optional)
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A theme switcher component that allows users to toggle between light and dark modes, persisting preferences and detecting system theme settings.More Resources
Common Features To Implement:
- Toggle between light and dark themes
- Persist theme preference (localStorage)
- System preference detection (prefers-color-scheme)
- Smooth transition between themes
- Apply theme to entire app (CSS variables or Context)
- Icon indicators (sun/moon icons)
- Toggle button/switch UI
- Respect system theme initially (optional)
- Multiple theme support (beyond just light/dark)
- CSS custom properties (CSS variables) for theming
- Context API for theme state management
- localStorage for persistence
- useEffect to apply theme class to document
- Media query: matchMedia for system preference
- Conditional rendering based on theme
- Toggle component (controlled/uncontrolled)
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A multi-digit input component for one-time passwords, with auto-focus navigation between fields, paste detection, and keyboard-only numeric input.More Resources
Common Features To Implement:
- Multiple input fields (typically 4-6 digits)
- Auto-focus next input on entry
- Auto-paste detection (paste OTP code)
- Backspace to go to previous input
- Only numeric input allowed
- Focus management and keyboard navigation
- Visual feedback for filled/empty states
- Error state display
- Resend OTP functionality (optional)
- Timer for resend countdown (optional)
- Accessibility: ARIA labels, input mode
- Multiple refs or array of refs (useRef)
- Controlled inputs with state array
- Event handlers: onChange, onKeyDown, onPaste
- Focus management (focus() method)
- Input validation (numeric only)
- String manipulation for paste handling
- Component state management for OTP values
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A comprehensive checkout form component with multiple sections for shipping, billing, and payment, including validation, order summary, and calculations.More Resources
Common Features To Implement:
- Multiple form sections (shipping, billing, payment)
- Form validation (required fields, email format, card number)
- Error messages display
- Order summary with items and totals
- Shipping address form
- Payment method selection
- Apply discount/promo code
- Calculate taxes and shipping costs
- Responsive layout
- Loading state during submission
- Success/error handling
- Save form data (localStorage, optional)
- Complex form state management
- Form validation (controlled inputs, validation functions)
- Error state handling
- Conditional rendering based on form state
- Calculations (totals, taxes, discounts)
- Form submission handling (onSubmit, preventDefault)
- Component composition (ShippingForm, PaymentForm, OrderSummary)
- State lifting for shared data
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An input component that allows users to add multiple tag-like chips by typing and pressing Enter, with individual removal and duplicate prevention.More Resources
Common Features To Implement:
- Add chips by typing and pressing Enter/comma
- Remove chips (X button)
- Edit existing chips (optional)
- Visual chip styling with rounded corners
- Duplicate prevention
- Max chips limit (optional)
- Keyboard navigation (Arrow keys, Delete)
- Focus management
- Disabled state
- Different chip variants (colors, sizes)
- Validation (e.g., email format for email chips)
- Managing array of chip values in state
- Array manipulation (add, remove, update)
- Controlled input component
- Event handlers (onKeyDown for Enter/Backspace)
- Conditional rendering for chips
- Inline editing state (optional)
- Focus management and refs
- Duplicate detection logic
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Advanced Level Machine Coding Questions
A wizard-style form component that breaks complex forms into multiple steps with progress indicators, step validation, and navigation controls.More Resources
Common Features To Implement:
- Multiple form steps/pages
- Progress indicator (step numbers, progress bar)
- Navigation between steps (Next, Previous, Skip)
- Step validation before proceeding
- Summary/Review step before submission
- Save form data as user progresses
- Go to specific step (optional)
- Step completion indicators
- Responsive design
- Error handling per step
- Accessibility: ARIA attributes for wizard pattern
- State management for current step and form data
- Step validation logic
- Conditional rendering based on current step
- Navigation logic (increment/decrement step)
- Data persistence between steps
- Form state management (controlled inputs)
- Progress calculation
- Component composition (StepIndicator, StepContent, NavigationButtons)
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23. Tree / Folder Navigation
A hierarchical tree component that displays nested folder/file structures with expand/collapse functionality, search capabilities, and keyboard navigation.More Resources
Common Features To Implement:
- Hierarchical tree structure display
- Expand/collapse nodes (folders)
- Nested levels (indentation)
- Icons for folders and files
- Click to select nodes
- Search/filter nodes
- Lazy loading children (optional)
- Drag and drop (optional)
- Checkbox selection (optional)
- Keyboard navigation (Arrow keys, Space, Enter)
- Accessibility: ARIA tree pattern
- Recursive component rendering
- Tree data structure (nested objects/arrays)
- State management for expanded/collapsed nodes
- Recursive functions for tree traversal
- Deep cloning for immutable updates
- Event bubbling and propagation
- DFS/BFS algorithms for search (optional)
- Memoization for performance (optional)
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24. Comment View / Multi-level Comments
A nested comment system that displays threaded conversations with replies, voting functionality, and collapsible threads with recursive rendering.More Resources
Common Features To Implement:
- Display nested comments (replies)
- Add new comments and replies
- Edit and delete comments
- Voting (upvote/downvote) or likes
- Reply-to functionality
- Threading visualization (indentation, lines)
- Collapse/expand comment threads
- Timestamp display (relative time)
- User avatars and names
- Sort options (newest, oldest, most liked)
- Real-time updates (optional)
- Character limit and validation
- Recursive component rendering for nested structure
- Tree/nested data structure management
- CRUD operations on nested data
- State management for nested comments
- Deep update functions (immutable updates)
- Event handling with parent-child relationships
- Sorting algorithms for nested data
- Date formatting and relative time
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25. Checkbox Folder Selection
A hierarchical checkbox component where parent checkboxes control their children, with indeterminate states and bidirectional state synchronization.More Resources
Common Features To Implement:
- Hierarchical checkbox structure
- Parent checkbox controls children (check/uncheck all)
- Child checkbox updates parent state (indeterminate)
- Indeterminate state visual (dash icon)
- Expand/collapse folders
- Select all functionality
- Count selected items
- Save selection state
- Search/filter with selection preservation
- Keyboard navigation
- Accessibility: ARIA attributes for treegrid
- Recursive component with checkbox state
- Tree data structure with selection state
- Calculating parent state from children (check/uncheck/indeterminate)
- Bidirectional updates (parent ↔ children)
- Deep traversal algorithms
- Immutable state updates for nested structures
- Indeterminate checkbox state handling
- Memoization for expensive calculations
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A drag-and-drop task management board with multiple columns (To Do, In Progress, Done) where cards can be moved between columns with full CRUD operations.More Resources
Common Features To Implement:
- Multiple columns (To Do, In Progress, Done)
- Drag and drop cards between columns
- Add/remove cards
- Add/remove columns
- Edit card content
- Card details (title, description, assignee, due date)
- Limit cards per column (optional)
- Column scrolling for many cards
- Responsive design
- Persist board state (localStorage/API)
- Search/filter cards
- Keyboard shortcuts
- Accessibility: ARIA drag and drop attributes
- HTML5 Drag and Drop API or react-beautiful-dnd
- State management for columns and cards (array of objects)
- Drag event handlers (onDragStart, onDragOver, onDrop)
- Moving items between arrays (immutable updates)
- Column and card CRUD operations
- Responsive layout with CSS Grid or Flexbox
- State persistence
- Complex state structure (nested arrays)
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An interactive tic-tac-toe game component with a 3x3 board, turn-based gameplay, win detection algorithms, and game state management.More Resources
Common Features To Implement:
- 3x3 game board
- Two players (X and O) alternate turns
- Win detection (rows, columns, diagonals)
- Draw detection
- Display current player
- Game status (playing, won, draw)
- Reset/New game functionality
- Game history (undo moves, optional)
- Highlight winning line
- Score tracking (optional)
- AI opponent (optional)
- Responsive grid layout
- State management for board (2D array or flat array)
- Turn management (tracking current player)
- Win condition algorithms
- Immutable updates (don't mutate state)
- Conditional rendering for game status
- Event handling for square clicks
- Algorithm for win detection
- Minimax algorithm for AI (optional)
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A calendar component that displays a monthly grid view with date navigation, event display, and the ability to view/add events on specific dates.More Resources
Common Features To Implement:
- Monthly calendar grid display
- Navigate between months (prev/next)
- Display current month and year
- Highlight today's date
- Show events/appointments on dates
- Click date to view/add events
- Different calendar views (month, week, day)
- Date range selection (optional)
- Mark weekends differently
- Responsive design
- Keyboard navigation
- Multiple event types with colors
- Recurring events (optional)
- Date manipulation (Date object, date-fns, or dayjs)
- Generating calendar grid (first day of month, days in month)
- Month navigation (add/subtract months)
- Managing events data (group by date)
- State management for selected date and events
- Array manipulation for calendar grid generation
- Conditional rendering for dates and events
- Date formatting and localization
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An email interface component with inbox list, email detail view, compose functionality, filtering, sorting, and folder navigation capabilities.More Resources
Common Features To Implement:
- Email list/inbox view
- Email detail view
- Email composition modal/form
- Mark as read/unread
- Star/favorite emails
- Delete emails
- Search/filter emails
- Sort emails (date, sender, subject)
- Folder/category navigation (Inbox, Sent, Trash)
- Pagination or infinite scroll
- Attachment indicators
- Responsive layout (list + detail or split view)
- Loading states
- Empty states
- Complex state management (emails array, filters, sort)
- CRUD operations on email list
- Filtering and sorting logic
- Routing or state for email detail view
- Form handling for compose
- Array methods (filter, sort, map, find)
- Component composition (EmailList, EmailItem, EmailDetail, ComposeForm)
- State lifting and prop drilling
- URL state management (optional)
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30. Chat Application Interface
A real-time chat interface component with message list, input field, auto-scroll functionality, typing indicators, and message status tracking.More Resources
Common Features To Implement:
- Chat message list with scroll to bottom
- Message input and send button
- User messages vs. other messages (different styling)
- Timestamp display (relative or absolute)
- Typing indicators (optional)
- Online/offline status (optional)
- Message reactions (optional)
- File/image attachments (optional)
- Emoji picker (optional)
- Auto-scroll to new messages
- Message status (sending, sent, delivered, read)
- Real-time updates (WebSocket simulation)
- Responsive design
- Accessibility: ARIA live regions for new messages
- State management for messages array
- Adding messages to list (immutable updates)
- Scroll management (scrollIntoView, scrollTop)
- Real-time updates (setInterval simulation or WebSocket)
- Controlled input for message text
- Conditional rendering for message types
- Date formatting for timestamps
- Performance: memoization, virtual scrolling (optional)
- Component composition (ChatWindow, MessageList, MessageInput, MessageBubble)
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