ReactJS

 

ReactJS

React.js is an open-source frontend JavaScript library for developing UI or User Interface parts. It is maintained by Facebook and a set of individual developers and companies. React can be used as a foundation in the development of single page or android applications. However, React is only concerned with state management and provide that state to the documented object model, so developing React applications usually requires the use of additional libraries for routing, as well as certain client- side functionality. React JS is an open-source JavaScript library designed at Facebook by Jordan Walked a Software Engineer in 2011 but released to the public in the month of May 2013. The main aim of React.JS is to give the better analysing the performance. Its solidity comes from the focus on each component. Using recyclable unit, it is found to be easy development for developers to design rich UI’s. React.JS incorporates with View part from M-V-C (Model View-Controller) model. React JS implements Single direction dataflow so that it gets simpler than old data binding. React uses virtual document object model it offers not so difficult programming with quick execution.

Why React?

• Speed
• Flexibility
• Performance
• Usability
• Reusable Components

A component in React

import React from 'react';

import ReactDOM from 'react-dom/client';

function Hello(props) {

  return <h1>Hello World!</h1>;

}

const root = ReactDOM.createRoot(document.getElementById("root"));

root.render(<Hello />)

ReactJS vs VanillaJS

VanillaJS is known as plain JavaScript and you will see that developers use Vanilla js to write JavaScript code that can be written without the help of libraries. You will see that VanillaJS is a scripting language that doesn’t set any type of rules about how the developers can define the data in the application. VanillaJS applications sometimes may not provide the best-optimized results for the application.

JSX

Consider this variable declaration:

Instead of artificially seperating technologies by putting markup and logic in seperate files, React separates concern with loosely coupled units called "components" that contain both. We will come back components in further section, but if you are not comfortable putting markup in JS, this talk might convince you otherwise.

React doesn't require using JSX, but most people find it helpful as a visual aid when working with UI inside the JavaScript code. It also allows React to show more useful error and warning messages.

Components

Conceptually, components are like JavaScript functions. They accept arbitrary inputs (called “props”) and return React elements describing what should appear on the screen. Components are what make up the visual layer of the application and let us split the User Interface into independent reusable pieces. Each part of the UI is built seperately as its own component and then added into a parent component making up the UI for a specific page.

One thing that can be noted about components is that they can be nested as deep as you want. A component can hold other component and that component can again hold other component and so on.

 

Component Lifecycle

It has three main phases:

1. Mounting phase for when the components are first being added to the DOM.

2. Updating phase for when we are modifying something and that component needs to be updated.

3. Unmounting phase for when the component will be removed from the DOM.

Commands

create-react-app

It creates the boilerplate files for a React application.

start

It starts up the development server so we can view our project right away.

run build

It builds a directory for a production build of our application for deployment.

Redux

Redux is an open-source JavaScript library for managing and centralizing application state. It is most commonly used with libraries such as React or Angular for building user interfaces.

The main reason to use React Redux are:

• React Redux is the official UI bindings for react Application. It is kept up-to-date with any API changes to ensure that your React components behave as expected.
• It encourages good 'React' architecture.
• It implements many performance optimizations internally, which allows to components re-render only when it actually needs.

Hooks

React follows the principle of component-based architecture. A component in React is an isolated and reusable piece of code. The components can be of two types – class components and functional components. With React Hooks, we can use state, and other React features, in a functional component. It empowers devs to do functional programming in React.

Limitations

React JS has few barrier while appearing as finest JavaScript library 

a. React only contract with the View from MVC so we demand other tooling to finish the backend development too.

b. Endeavoring developers complain about JSX programming in the learning phase and is treated as barrier.

c. Reacts environment modify so fast that developers often find it difficult to accept to the new changes, relearn and appliance them. Developer’s consistently needed to be updated with their skills and also with modification done in the React.JS environment.

Conclusion

Facebook developed React JS for their own ambition and later open sourced it in 2013. Since then, within a very less time React.JS has gained incredible fame among the developers and tech industry. Even though few limitations that React.JS has it is absolutely revolutionary. It has import a new dimension in the web application development. Client’s requirements are enhancement fast and advancing so is React.JS. React.JS accelerates the application adaptability and it can be seen that React.JS has a larger scope as well worth   the efforts. React.JS has it all which can accomplish the requirements of today’s world. So, it can be said that React.JS has the capability to affect modern day web development.

Authors- Swapnil Gutte, Soham Sattigeri, Sharvin Tanwade and Sourajdip Pramanik