Virtual DOM in React:
- What it is: A lightweight, in-memory representation of the actual DOM that React uses to efficiently update the UI.
- How it works:
- Rendering: React creates a virtual DOM tree when you render a component.
- Reconciliation: When data changes, React creates a new virtual DOM tree and compares it with the previous one to identify differences.
- Diffing Algorithm: React employs a diffing algorithm to determine the minimum changes needed in the actual DOM.
-
Updating the Actual DOM: React updates only the necessary elements in the real DOM, minimizing expensive DOM manipulations.
React isn't the only library utilizing a virtual DOM strategy; Vue.js also employs it. Svelte offers a different approach, optimizing applications by compiling components into small JavaScript modules.
Setting up your Environment:
- Install Node.js and npm (or yarn) node
- *Create a React App *
npx create-react-app my-react-app
Core React Concepts:
Components: React applications are built using reusable components. These are independent, self-contained blocks of code that define how a part of the UI should look and behave.
JSX: JSX (JavaScript XML) is a syntax extension that allows you to write HTML-like structures within your JavaScript code. It's a convenient way to define the UI of your components.
Props: Components can receive data or configuration options from their parent components using props. This allows for building flexible and reusable components.
State: Components can manage their own internal state using the
useState
hook. State allows components to react to user interactions or data changes and update their UI accordingly.
Building a Basic App:
cd my-react-app
-
npm start
(oryarn start
) http://localhost:3000/browser -
create-react-app
includes anApp.js
import React from 'react';
function App() {
return (
<h1>Hello, React!</h1>
);
}
export default App;
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