REACT

Introduction:

-> ReactJS is a JavaScript library for creating reusable user interface components that is declarative, efficient, and versatile.

-> It’s an open-source, component-based front-end library that’s just responsible for the application’s view layer.

-> A ReactJS application consists of several components, each of which is responsible for producing a short, reusable piece of HTML code. All React apps are built around components.

Why learn ReactJS?

-> Despite the fact that there are numerous JavaScript frameworks accessible today (such as Angular and Node), React was introduced to the market and quickly gained popularity. The earlier frameworks used the DOM to follow a standard data flow topology (Document Object Model).

-> When a web page is loaded, the browser creates a document object (DOM). It dynamically adds or removes data on the back end, and when any changes are made, a new DOM is built for the same page each time. The application’s performance suffers as a result of the repeated construction of DOM, which wastes memory and slows it down. As a result, the ReactJS framework was created, which eliminates this flaw.

-> ReactJS allows you to break down your entire app into different components.

-> ReactJS still follows the same traditional data flow, but it does so on a virtual DOM rather than the browser’s Document Object Model (DOM).

-> This means that rather than changing the document in the browser following changes to our data, it resolves changes on a DOM generated and executed entirely in memory.

React’s Design Concepts:

React has three main design concepts: Components, React Virtual DOM, Props And PropTypes In React.

Components:

This component is the owner of the Header and Content. We are creating Header and Content separately and just adding it inside the JSX tree in our App component. Only the App component needs to be exported.

React Virtual DOM:

-> The virtual DOM is only a virtual representation of the DOM. Every time the state of our application changes, the virtual DOM gets updated instead of the real DOM.

Props And PropTypes In React:

-> React allows us to pass information to components using things called props (short for properties). Because React comprises several components, props make it possible to share the same data across the components that need them.

-> It makes use of one-directional data flow (parent-to-child components). However, with a callback function, it’s possible to pass props back from a child to a parent component.

-> These data can come in different forms: numbers, strings, arrays, functions, objects, etc. We can pass props to any component, just as we can declare attributes in any HTML tag.

Why is React So Fast ?

-> The rapid DOM rendering speed of REACT is one of the reasons for its popularity. Reading and writing to the DOM is slow, and every time we read or write to the DOM becomes expensive, slowing down the application.

-> Because it has a virtual DOM that only writes to the browser when it needs to, reading and writing to JS objects is faster.

-> React never reads from the real DOM, and only makes DOM updates if something has changed.

Advantages:

-> ReactJS is a really intuitive to use framework that adds interactivity to any UI layout. Furthermore, it enables rapid and high-quality application development, which saves time for both clients and developers.

-> Significant data changes in ReactJS result in automatic updates to chosen areas of user interfaces. There is no need to do any additional functions to update your user interface because of this progressive functionality.

-> Provides SEO-friendly interface design across browsers and engines with reusable components.

-> Provides Reusable Components.

Conclusion:

React JS has arrived at an ideal time, allowing developers to create extremely engaging web apps and user interfaces in a short amount of time. It enables you to deconstruct the components and create a single-page application with less coding.