Masonry Grid Image Gallery

A responsive image gallery built with React, TypeScript, and styled-components, featuring infinite scroll and optimized image loading.

Design Decisions

Architecture and Component Structure

1. Component Organization

   • Components are organized by feature and shared functionality
   • Shared components are placed in a shared directory for reusability
   • Styles are co-located with their components for better maintainability

2. Performance Optimizations

   • Masonry grid layout using useMasonryLayout hook
   • Lazy loading images using IntersectionObserver
   • Eager loading for above-fold content
   • Memoization of components and expensive calculations
   • Image optimization with different sizes based on viewport

3. State Management

   • Context API for global loading and error states
   • Local state for component-specific data
   • Custom hooks for reusable logic and data fetching

4. Loading States

   • Initial page load shows a full-screen loading indicator
   • Infinite scroll shows a minimal loading indicator at the bottom

5. Error Handling

   • Centralized error handling through LoadingContext
   • User-friendly error messages with toast notifications
   • Graceful fallbacks for failed image loads

6. Styling Approach

   • Styled-components for component-scoped CSS
   • Responsive design with mobile-first approach
   • Consistent styling through shared variables and themes

7. Code Quality

   • TypeScript for type safety
   • Memoization to prevent unnecessary re-renders
   • Consistent file and folder structure
   • Separation of concerns between components

8. User Experience

   • Smooth transitions between loading states
   • Responsive grid layout adapting to screen size
   • Optimized image loading based on viewport
   • Clear loading and error feedback

9. Testing and Maintainability

   • Components designed for testability
   • Props interfaces clearly defined
   • Consistent naming conventions
   • Modular code structure for easy updates

Available Scripts

In the project directory, you can run:

yarn start

Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.

The page will reload if you make edits.
You will also see any lint errors in the console.

yarn test

Launches the test runner in the interactive watch mode.
See the section about running tests for more information.

yarn run build

Builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.

yarn run analyze

Analyzes the bundle size using source-map-explorer.

Learn More

You can learn more in the Create React App documentation.

To learn React, check out the React documentation.