{"id":2553,"date":"2026-08-03T12:30:44","date_gmt":"2026-08-03T05:30:44","guid":{"rendered":"https:\/\/sumberlaba.com\/index.php\/2026\/08\/03\/what-is-react-js-a-beginners-guide-to-the-popular-javascript-library\/"},"modified":"2026-08-03T12:30:44","modified_gmt":"2026-08-03T05:30:44","slug":"what-is-react-js-a-beginners-guide-to-the-popular-javascript-library","status":"publish","type":"post","link":"https:\/\/sumberlaba.com\/index.php\/2026\/08\/03\/what-is-react-js-a-beginners-guide-to-the-popular-javascript-library\/","title":{"rendered":"What is React.js? A Beginner&#8217;s Guide to the Popular JavaScript Library"},"content":{"rendered":"<h1>What is React.js? A Beginner&#8217;s Guide to the Popular JavaScript Library<\/h1>\n<p>React.js, commonly known as React, is an open-source JavaScript library developed by Facebook in 2013. It is designed to build user interfaces for web applications by breaking them into reusable components. Today, React powers thousands of websites, from small startups to major platforms like Instagram and Netflix.<\/p>\n<p>Unlike traditional approaches that update the entire page, React focuses on efficiently rendering only the parts that change. This is achieved through a virtual DOM, a lightweight representation of the actual DOM that allows React to compare changes and apply updates with minimal performance cost.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/via.placeholder.com\/800x600\/4a90d9\/ffffff?text=what%20is%20react%20js\" alt=\"Article illustration\" style=\"display:block;margin:20px auto;max-width:100%;height:auto;border-radius:8px;\" \/><\/p>\n<h2>Core Concepts of React<\/h2>\n<h3>Components: The Building Blocks<\/h3>\n<p>Everything in React is a component. A component is a JavaScript function or class that returns a piece of UI. Components can be nested, passed props, and reused across the application, making your code modular and easier to maintain.<\/p>\n<h3>JSX: JavaScript with HTML<\/h3>\n<p>React uses JSX, a syntax extension that lets you write HTML-like code directly inside JavaScript. This makes the UI code more readable and intuitive, as you can see the visual structure right alongside the logic.<\/p>\n<h3>State and Props<\/h3>\n<p>State is the internal data of a component, while props are data passed from parent to child components. By managing state and props, React creates dynamic, data-driven interfaces that respond to user actions and server data.<\/p>\n<h2>Why Choose React?<\/h2>\n<ul>\n<li><strong>Reusable Components:<\/strong> Write once, use everywhere.<\/li>\n<li><strong>Performance:<\/strong> The virtual DOM ensures fast and smooth updates.<\/li>\n<li><strong>Strong Ecosystem:<\/strong> Tools like React Router and Next.js extend its capabilities.<\/li>\n<li><strong>Active Community:<\/strong> Backed by Meta and thousands of developers worldwide.<\/li>\n<\/ul>\n<h2>Getting Started<\/h2>\n<p>To start using React, simply create a new project with the command <code>npx create-react-app my-app<\/code>. Once installed, you can edit the App.js file and see your changes instantly in the browser.<\/p>\n<p>In summary, React.js is a powerful yet approachable library that simplifies front-end development. Its component-based architecture and efficient rendering make it an essential tool for modern web developers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is React.js? A Beginner&#8217;s Guide to the Popular JavaScript Library React.js, commonly known as React, is an open-source JavaScript library developed by Facebook in 2013. It is designed to build user interfaces for web applications by breaking them into reusable components. Today, React powers thousands of websites, from small startups to major platforms like &hellip; <\/p>\n","protected":false},"author":2716,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-2553","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/posts\/2553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/users\/2716"}],"replies":[{"embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/comments?post=2553"}],"version-history":[{"count":0,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/posts\/2553\/revisions"}],"wp:attachment":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/media?parent=2553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/categories?post=2553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/tags?post=2553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}