ReactJS is a JavaScript library for creating reusable UI components that are declarative, quick, and versatile. It's a component-based, open-source front end library that exclusively handles the application's view layer. Jordan Walke, a software engineer at Facebook, was the one who came up with the idea. It was created and maintained by Facebook at first, and it was eventually integrated into major products such as WhatsApp and Instagram. ReactJS was first developed in 2011 for Facebook's newsfeed section, but it was first made public in May 2013.
The MVC (model view controller) design is now used by the majority of websites. React is the 'V' in MVC architecture, which stands for view, whereas Redux or Flux provides the architecture
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. These components can be stacked with one other to create sophisticated applications from simple building blocks. To populate data in the HTML DOM, ReactJS uses a virtual DOM-based technique. The virtual DOM is quick because it simply modifies individual DOM elements rather than reloading the entire DOM every time.
Although there are numerous JavaScript frameworks on the market today (such as Angular and Node), React emerged and quickly became popular. The previous frameworks used the DOM to implement a typical data flow structure (Document Object Model). When a web page is loaded, the browser creates a document object called the Document Object Model (DOM). It dynamically adds or removes data on the back end, and if any changes are made, a new DOM for the same page is produced. The application's performance is harmed by the constant construction of DOM, which wastes memory and slows it down./p>
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 uses the same traditional data flow as before, but it does not operate directly on the browser's Document Object Model (DOM); instead, it uses a virtual DOM. It means that after modifications to our data, instead of modifying the document in a browser, it resolves changes on a DOM generated and operated totally in memory. React identifies what modifications were made to the actual browser's DOM after the virtual DOM has been updated.
React is a front-end JavaScript toolkit for creating user interfaces based on UI components that is free and open-source. Meta and a community of individual developers and businesses work together to keep it running
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Facebook created React in 2011 as a declarative, fast, and extensible open-source front-end JavaScript toolkit. It uses a component-based technique to create reusable UI components, which is particularly useful for single-page applications. It's used to create interactive view layers for online and mobile applications. Jordan Walke, a Facebook software engineer, designed it. It was first utilised in Facebook's News Feed section in 2011 and has since been adopted by other Facebook products such as WhatsApp and Instagram.
The following is a list of React's most significant drawbacks: React is nothing more than a library. It isn't a full-fledged framework. It has a large library that takes some time to comprehend. New programmers may find it challenging to comprehend and code. Inline templating and JSX are used by React, which can be challenging and function as a barrier. It also complicates the coding.
Facebook created React in 2011 as a declarative, fast, and extensible open-source front-end JavaScript toolkit. It uses a component-based technique to create reusable UI components, which is particularly useful for single-page applications. It's used to create interactive view layers for online and mobile applications. Jordan Walke, a Facebook software engineer, designed it. It was first utilised in Facebook's News Feed section in 2011 and has since been adopted by other Facebook products such as WhatsApp and Instagram.
p>JSX is a method of creating React user interfaces that incorporates the functionality and dynamic nature of JavaScript while using the basic syntax of HTML. In a nutshell, our React apps are structured using HTML + JavaScript. Although JSX appears to be HTML, it is JavaScript function calls. It's the equivalent of calling React when you write a div in JSX. createElement(). We can manually call React to create our user interfaces. createElement, but as we add additional items, the structure we've established gets increasingly difficult to interpret. Because the browser does not understand JSX, we frequently use Babel, a JavaScript compiler, to turn what appears to be HTML into JavaScript function calls that the browser can understand.
React fragments are a feature that allows you to write a set of children elements or components without actually generating a node in the DOM.
The fragment syntax appears as an empty collection of tags>/> or as React. Fragment tags.
To put it another way, there are occasions when we need to group numerous React elements into a single parent yet don't want to use a generic HTML element like a div.