what is react js ? how to learn react
React is an open-source JavaScript library for building user interfaces or UI components.
It was developed by Facebook and has gained popularity due to its
simplicity, performance, and flexibility.
React allows developers to build complex, interactive UIs by breaking them down into reusable components.
Each component is responsible for rendering a specific part of the UI and can be reused across different pages or applications.
One of the main advantages of React is its use of a virtual DOM (Document Object Model). The virtual DOM allows React to update only the parts of the UI that have changed, rather than updating the entire UI.
This leads to faster and more efficient rendering of the UI.
React is often used in conjunction with other libraries and tools, such as Redux for state management and React Router for routing.
Overall, React is a powerful and flexible tool for building modern web applications with complex user interfaces.
Node js
Node.js, commonly referred to as simply "Node", is an open-source, cross-platform, server-side runtime environment that
allows developers to run JavaScript on the server-side. It is built on top of the V8 JavaScript engine,
which is the same engine used by Google Chrome to execute JavaScript code in the browser.
Node.js provides an event-driven, non-blocking I/O model that makes it well-suited for building scalable,
real-time applications. It includes a number of built-in modules that allow developers to perform tasks such as
reading and writing files, making HTTP requests, and creating network servers.
One of the main advantages of Node.js is its ability to handle a large number of concurrent connections without blocking,
which makes it ideal for building real-time applications such as chat applications, online gaming platforms, and collaborative tools.
Node.js is also widely used in web development, particularly in the development of server-side applications and APIs.
It can be used with popular web frameworks such as Express.js and Nest.js to create robust and scalable web applications.
Overall, Node.js is a powerful and versatile platform for building server-side applications and has gained widespread
adoption in the web development community.
npm
npm is a package manager for Node.js, and it can be used to manage packages and dependencies
for React projects as well. When you create a new React project using create-react-app,
it automatically initializes an npm project with a package.json file that lists the project dependencies.
npm is command-line tools for working with Node.js packages.
This will install the latest version of React and React DOM in your project's node_modules folder, and add them to the dependencies section of the package.json file.
You can also use npm to manage development dependencies and install packages for your build process, such as Babel or Webpack.
In addition to installing packages, npm can be used to run scripts defined in the package.json file. For example, you can use npm start to run the start script, which typically starts a development server for your React project.
Overall, npm is a powerful tool for managing packages and dependencies for your React project, and it's an essential part of the React development workflow.
You can use npm to install packages and manage dependencies for your React project. For example,
you can install React and React DOM packages using the following command:-
npm install react react-dom
npx
npx is a command-line tool that is included with Node.js since version 5.2.0. It allows you to execute Node.js packages without having to install them globally or locally. The name `npx` stands for "Node Package eXecute".
When you run `npx <command>`, `npx` checks whether the specified command exists in the current directory or in the `node_modules` directory of the current project. If it doesn't exist, `npx` downloads the latest version of the package and runs the specified command from the downloaded package.
This allows you to use tools and utilities from the Node.js ecosystem without having to install them globally or manually manage their versions. For example, you can use `npx` to run `create-react-app` to generate a new React project, even if you don't have `create-react-app` installed globally on your system:
npx create-react-app my-app
This will download the latest version of `create-react-app` and use it to create a new React project in the `my-app` directory.
`npx` can also be used to run executables that are included in packages, such as testing frameworks, build tools, or linters. This allows you to use different versions of the same tool on a per-project basis, without having to install and manage them globally.
Overall, `npx` is a useful tool for executing Node.js packages and utilities, and it can simplify the process of working with the Node.js ecosystem.
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