Let’s explore React JS
Today I describe some fundamental concepts of React JS.
Lets Start !!!
What is React JS:
React is a small JavaScript library. In most cases, it is used for front-end development. React was created by Jordan Walke, a software engineer at Facebook. It is widely used for creating interactive and dynamic web applications. In MVC(Model View Controller) pattern, react is only working on the applications view layer. View layer is responsible for how the app looks. React is open-source, component-based, front-end library. React allows developers to build reusable UI components and manage the state of their applications efficiently.
Some key concepts React.js:
Virtual DOM: React uses a Virtual DOM to improve performance. It’s a lightweight representation of the actual DOM, and when state changes occur, React calculates the difference between the Virtual DOM and the real DOM and updates only the necessary parts of the DOM, reducing expensive DOM manipulations.
Components: In React, applications are built using components. A component is a reusable piece of UI that can be composed together to create complex user interfaces. Components can be both functional (stateless) and class-based (stateful).
JSX: JSX stands for JavaScript XML, and it’s a syntax extension for JavaScript. It allows you to write HTML-like code within your JavaScript code, making it easier to define the structure of your components.
Props: Props (short for properties) are a way to pass data from a parent component to a child component. Props are read-only and help you achieve component reusability.
State: State is used to manage dynamic data within a component. Class components have their own state, while functional components can use the useState hook to manage state.
Hooks: Hooks are functions that allow you to “hook into” React state and lifecycle features from functional components. Some commonly used hooks include useState, useEffect, useContext, and more.
Lifecycle Methods: In class components, there are lifecycle methods like componentDidMount, componentDidUpdate, and componentWillUnmount that allow you to control the behavior of a component at different stages of its lifecycle.
Component Lifecycle vs. Hooks: With the introduction of hooks, many of the traditional class component lifecycle methods have become less necessary. Hooks provide a more streamlined way to manage side effects and component behavior.
Routing: While React itself doesn’t provide built-in routing, popular libraries like react-router can be used to handle routing in React applications.
State Management: For managing complex application states that need to be shared among multiple components, you might consider using libraries like Redux or the Context API in combination with hooks.
Styling: React applications can be styled using CSS, CSS-in-JS libraries like Styled Components, or CSS pre-processors like Sass.
Testing: React applications can be tested using various testing libraries such as Jest and React Testing Library.
To get started with React, you’ll need to set up a development environment, including Node.js and a package manager like npm or Yarn. Then, you can create a new React application using tools like Vite. From there, you can gradually learn and experiment with the concepts mentioned above while building your applications.
