Every front-end and web developer understands how inconvenient it is to write the same code in different places. They are compelled to do a lot of coding if they need to add a button to several sites. Other frameworks force developers to rebuild the majority of their code, even when creating regularly changing components. Developers desired a framework or library that would allow them to break down complex components and reuse code to accomplish projects more quickly. This is when React comes in and solves the issue.

What is react.js?

ReactJS is a widely used open-source JavaScript library created by Facebook. It can control the view layer for both online and mobile-based apps. ReactJS is mostly used to create reusable UI components. It has an easy-to-use UI. Its large community is always there to help you.

The main benefit of ReactJS is that it allows you to create a User Interface (UI) to speed up your application. Furthermore, the JavaScript virtual DOM is quicker than the conventional DOM and is responsible for performance improvements.

ReactJS is based on components, which is one of its most appealing features. As a result, the complex code is split down into components that help engineers organize their codes better. The entire user interface is divided into reusable components. All of these elements are created individually and then combined into a parent component that is rendered afterwards. Each component is in charge of producing a small, reusable chunk of HTML code. These components can be stacked with one other to create complex applications using only a few basic building pieces.

React’s components and data structures boost readability and help you deal with huge projects. ReactJS can be used on the client, server, and with a variety of other frameworks.

You can start constructing basic projects like a simple todo app, a simple calculator app, a shopping cart, and showing GitHub’s user statistics using the GitHub API once you have a basic understanding of React. Get assistance for your project from the best react agency.
Checklist/Prerequisites
1.Basic knowledge of HTML, CSS, and JavaScript
2.Certain ES6 features of Javascript including Let and Const, Arrow Functions, Class, and ‘this’ keyword
3.Fundamentals of NodeJS & Code Editors

1.HTML, CSS, Javascript
These are the three things that any front-end developer needs to get started. These are the fundamentals of frontend web development, and they all work together to create a fully effective web application or website.

2.Javascript ES6 Features
ES6 is the latest version of JavaScript, and it comes with a slew of new capabilities. To get started with ReactJS, you’ll need to understand Let and Const, Arrow Functions, Class, and the ‘this’ keyword. Let’s take a closer look at each of these ES6 features:
let and const
You would use ‘let’ and ‘const’ instead of the var keyword. They aren’t the same as var at all. Let creates a local variable whose scope is restricted to the block in which it is declared. Const denotes a variable with fixed values that cannot be changed.
Arrow function
The arrow function allows you to write a function with a reduced syntax. It cleans up and improves the readability of your code.
Class and ‘this’ keyword
In ES6, you’ll need to understand Object-Oriented Programming principles like Method, Class, and Objects. These topics may have already been taught to you in Java or C++.
The ‘this’ keyword represents the currently running item. For many developers, the concept of ‘this’ keyword is perplexing. As a result, make certain to clear up any ambiguity. You should also learn how to use the Apply, Call, and Bind methods. These methods are used to connect or bind the keyword ‘this’ to a specific object.
3.NodeJS Fundamentals & Code Editors
Working with ReactJS necessitates a solid understanding of NodeJS principles. In layman’s terms, NodeJS is a javascript execution environment. Many people believe it is a programming language, although this is not the case. Every browser has an inbuilt JavaScript Engine; for example, Chrome has a V8 engine and Mozilla Firefox has SpiderMonkey. You can’t do anything outside of the browser, including file operations, OS activities, or network operations, therefore Node was created. All of these tasks are possible with Node outside of the browser. Chrome’s V8 engine is incorporated in it.
NPM (Node Package Manager) is a package manager that can be used to add node modules and packages to your project. For python, the installation is equivalent to PIP.

Keywords for import and export:

You must use the ‘import’ keyword to use the Node module after installing it through NPM inside your project.
When constructing a component or module, use the ‘Export’ keyword. Instead of returning all variables and methods, you only need to return a part.

How to learn ReactJS?

All of the preceding topics were prerequisites for using ReactJS. Now that you’ve learned all of the above, it’s time to dive into React. First, grasp the fundamentals of React. We’ll start with a high-level overview.
Facebook created React, a Javascript library for creating interactive User Interfaces. It uses a component-based design, which means you’ll break down your entire user interface into reusable components, which will subsequently be assembled into a parent component and rendered. The following are some key ReactJS concepts to master.hire reactjs developers
Component Architecture State:
The term ‘state’’ refers to the storage of synchronous variables in a component architecture. When you update the value of a state variable, it is immediately reflected in all of the places where that variable is utilized.
Props work in the same way as arguments do in a function or method. Props (arguments) are supplied as input arguments into an HTML tag in React.
Class Components, Functional Components
CSS styling in React.
Learn how to use React apps to connect to APIs.

React Router:
You can learn how to use React routing to understand how routing works in a React application. To study ReactJS, you must first learn how to load the content of a certain website or how to use React Router to efficiently redirect to a specific page.
It becomes straightforward to construct projects like the Hacker News clone or a basic CRUD application once you have a good understanding of React Router.

Webpack:
Webpack is a Javascript module bundler that helps developers maintain project dependencies such as static files. As a result, the developers’ workload is lighter. Webpack also has loaders that do certain tasks for your project.

Server Rendering:
When you understand this notion, you’ll be able to create components on the server and then render them as HTML in your browser. ReactJS is used once each JavaScript module has been downloaded into the browser. One of React’s most intriguing features is server rendering, which can be utilized with any back-end technology.

Redux:
In a complicated application, you need to be able to manipulate states across multiple components. This problem is solved by Redux, a Javascript library. It keeps track of the application’s status. All of your states are stored in a single source in Redux.

This is a step-by-step guide to learning React from the ground up,if you have any queries,keep in touch with react development services for your doubts. We hope you found this information useful!!!