React js is a front-end framework that allows you to build user interface components. It is built upon a declarative data flow structure and works with the browser’s Document Object Model (DOM) to provide an efficient solution for complex user interfaces.
Re-Rendering with State
The re-rendering feature in React is based on the use of keys to maintain state between re-renders. Keys allow React to keep track of the identity of each component and how it can be updated or destroyed.
Using JSX to create React Components
The React library uses a syntax extension called JSX to make React components a lot simpler. This is done by separating the logic from the HTML, CSS, and JavaScript code.
Creating React Components by Passing Props
The Props feature in React allows you to pass JavaScript data to your components through a JSX element. The component can then use the props to fetch or create data.
Adding Event Handlers to Your Components
React supports event handlers that you can use to update a component’s state or trigger prop changes. You can also set your components to listen to window events.
Managing the DOM and Props
The DOM is declarative in React, meaning that it’s up to the developer to write the code that updates the DOM when a user interacts with your application ( more informations ). This makes it faster and more reliable than other front-end technologies that need to read or write each DOM element on every page load.
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