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React Tutorial: Everything you need to know

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24th Sep, 2022
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React Tutorial: Everything you need to know

React JS is one of the most popular languages available for building web applications, used by over 500 fortune companies to deal with singular page applications instead of JavaScript frameworks. React JS is suited for beginners hunting abundant opportunities in the current and future tech market.

Keep reading to inherit the basics and complex features of React JS. 

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What is React.JS?

React.js is an open-sourced JavaScript-based UI library required to build the user interface for single-paged applications. It handles the view layer and creates reusable UI components for web pages and mobile apps. React first officially appeared in 2013. However, it was introduced by Jordan Walke on Facebook in 2011 and then on Instagram in 2012.

React enables developers to produce extensive web applications preventing usual reloads, delivering faster and more efficient results. Functioning only on user interface applications, React JS corresponds to the MVC template as well.

Why is React an essential programming language?

React’s popularity has outshined all the other trending front-end developmental networks. Here’s why:

  • Easy creation of applications: React simplifies the creation of dynamic web applications with fewer coding requirements. However, other programming languages demand extensive coding.  
  • Improved Performance: It uses Virtual DOM to accelerate the web application building process. Virtual DOM shoots a comparison between the components’ previous states and upgrades the items in Real DOM. Conventional applications are used to convert main web application components.
  • Reusable components: Components work as the building blocks of any React application, necessary for most single apps. These components are built-in with logic and control to reuse throughout the application.
  • Uni-directional data flow: React supports a uni-directional flow, meaning child components are included with parent components. Since it mostly takes place in a single direction, it helps analyse and debug found errors.
  • Simple learning curve: React comparatively has a simple learning process with the combination of basic HTML and JavaScript concepts. 
  • Used in both development and web apps: React is fit to create web and mobile applications.
  • Dedicated tools for debugging: A Chrome extension is used for debugging React applications. 

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What are the types of React Components?

The types of React components are:

  • Functional Components 
  • Class Components
  • Pure Components
  • High Order Components

Functional Components:

These functions take in props and mark a JSX return. A functional component is required in React Hooks but not in State and Lifestyle methods. The functional component in React enables information display, better performance, debugging, and testing.

Class Components:

Class components are commonly used components of React with a few properties similar to functional ones. It utilises the main functions of React, state props, and lifestyle methods.

Pure Components:

These components return a render function optimal to other attributes. Pure components are used for optimisation due to their efficiency. 

Higher-Order Components:

High Order Components (HOC) is an advanced, progressive technique to reuse a component logic. API does not consider such components for its beneficiaries. Instead, these are mainly used to share logic with other components.

A simple HOC rundown deals with two processes:

  1. Receive data from stats or props
  2. Create an array and add up a React component for every element.

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Why is React still used in 2022?

Here’s why React is one of the best languages to learn in 2022:

  • React is declarative: The language allows developers to emphasise user interfaces and make the language simple to learn. 
  • A well-supported library: It helps build extensive and well-supported packages and NPM packages. Pre-build component libraries are also used to create better UIs. 
  • Easy to scale: These are various reasons why React is easy to scale:
  1. It can scale thousands of components to create complex applications in a limited time.
  2. Versatility to get in touch with third-party libraries and frameworks.
  3. It can also create cross-network applications between users and products. 
  • Strong Community Support: React’s success as a programming language is resulted from a strongly knit community, sharing libraries from different sources and providing answers to various technical issues.

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Summing Up: 

React is one of the best languages you can harp upon due to its easy, flexible, and versatile properties. The language might seem complex, but a professional course with fundamental concepts can clarify the process. 

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Pavan Vadapalli

Blog Author
Director of Engineering @ upGrad. Motivated to leverage technology to solve problems. Seasoned leader for startups and fast moving orgs. Working on solving problems of scale and long term technology strategy.

Frequently Asked Questions (FAQs)

1What is the difference between Stats and Props in React?

The main difference between Stats and Props is that Stats is an internal part of the component, whereas Props is controlled externally and by whoever renders the attribute.

2Can React be used without Babel?

React can function without Babel and can still be signified as one of the best programming languages.

3 What are the three dots used in React?

The Spread Syntax, also known as the Spread Operator, uses an iterable like string or an array expression to expand the project.