React

React is a javascript front end library

Why should use react?

1. Reusable components
2. SPA (Single page application)
3. Virtual Dom concept
4. Dynamic markup (JSX)

PREREQUISITE:

1. Basic Javascript (Datatypes, function and loops)
2. Promises and Assynchronous
3. Array methods like forEach & map()
4. Fetch API and making HTTP request

Topics:

1. Fundamental
2. HTTP
3. Routing
4. Redux
5. Utilities

1. Fundamental

Two ways to create react project:

What is NPX? NPX is nothing but npm package runner NPX - npx create-react-app project_name NPM - npm install create-react-app -g ; create-react-app project_name

Components:

Components are return html elements. each components are reusable

Two types:

1. Functional components Example
2. Class components Example

Props:

Props means inputs of component or attributes of component or parameters of component. Props are arguments passed into React components. Props are passed to components via HTML attributes.

Props Example

State:

React components has a built-in state object. The state object is where you store property values that belongs to the component. When the state object changes, the component re-renders.

1. Functional component - useState
2. Class component - this.state State Example

Event Handler:

Handling element events onclick, keyup, keydown, mousehover, mouseout and so on

Class Event Example Function Event Example

Available Scripts

In the project directory, you can run:

npm 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.

npm test

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

npm 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.

The build is minified and the filenames include the hashes.
Your app is ready to be deployed!

See the section about deployment for more information.

npm run eject

Note: this is a one-way operation. Once you eject, you can’t go back!

If you aren’t satisfied with the build tool and configuration choices, you can eject at any time. This command will remove the single build dependency from your project.

Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.

You don’t have to ever use eject. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.

Learn More

You can learn more in the Create React App documentation.

To learn React, check out the React documentation.

Code Splitting

This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting

Analyzing the Bundle Size

This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size

Making a Progressive Web App

This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app

Advanced Configuration

This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration

Deployment

This section has moved here: https://facebook.github.io/create-react-app/docs/deployment

npm run build fails to minify

This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify