This react app uses mix of Design & Performance Patterns

• List Virtualization: one of the main Performance Patterns, In simple words how you can display large lists of data efficiently by focusing on rendering just items visible to user.

  In this project we use a performant and versatile virtualized masonry grid for React called Masonic which based on react-virtualized.

• Optimize loading third-parties Lazy loading all images by providing loading attribute lazy which means load images only when user scroll to them.

• Hooks Design Pattern We use some built-in React Hooks " useState, useEffect, useCallback, useRef " in addition to some hooks provided by Masonic like " useContainerPosition, useMasonry, usePositioner, useScroller " , which allows us to use React state and lifecycle methods without having to use a ES2015 class components.

• React
• TypeScript
• Masonic

• We use a free public API from TVMAZE which returns all popular shows with all info we need.

1. Clone the repo

   git clone https://github.com/MohamedSaber19/react-performance-patterns.git

2. Install NPM packages

   npm install

3. Run the App

   npm run devstart

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

We used Chrome Lighthouse extension in the browser dev tools to measure performance after implementing the virtualization and below a screenshot of the report on desktop version Timespan mode

You can have your own report by navigating to Lighthouse tab in dev tools then select Timespan mode and select the device desktop/mobile and then check performance checkbox from categories section then click on Start timespan button.

• The app is fully responsive on all screens.
• You can check the virtualization by inspecting the grid in the Elements tab in dev tools, you will see that only few divs rendered within the viewport and while you scroll more divs are rendered and replace the out-of-viewport divs.
• To run the production build from the app on Heroku it's required to add a server & update the scripts in package.json.

You can check the live production build here