![]() ![]() We need node js because we can utilize the node package manager or NPM feature. So for that visit Node.js official site which is /en/download and install the correct and appropriate version. So the first thing you need to do is install Node.js if you don’t have it already installed on your system. Let’s get started with our first react application. React gets its name from the fact that it reacts to state changes and updates the DOM whenever the changes occur. That is, instead of writing code in query and manipulating the DOM or attaching an event handler to the DOM elements, we can simply change the state of our components and react will automatically update the DOM to match that state. Hence, unlike vanilla javascript or Jquery, when we build an application with react, we no longer have to work with the DOM API in the browser. It figures out what is changed and then it will update a part of the real DOM to keep it updated and in sync with the virtual DOM. So, whenever we change the state of the component we receive a new react element, react will then compare this element and its children. Unlike the browser or the real Document Object Model, this Virtual Document Object Model(DOM) is very easy to create. Hence, react keeps a very lightweight representation of the DOM in memory which is referred to as the virtual DOM. Note that it’s not a DOM element, it is just a plain JavaScript object that represents that DOM element in memory. The output provided from that render method is the React Element which is a simple plain JavaScript object that maps to a DOM element. The state helps to display the data when the components are rendered and the render method is responsible for describing what the UI should look like. In terms of implementation, a component is typically implemented as a JavaScript class that has some state and render method. But JSX makes it a whole lot easier to create a React application. React embraces the use of JSX but though it is not mandatory to use JSX to write React applications, simple JS will suffice. So, every react application is essentially a tree of components. A component is essentially a piece of the UI so when building the application with react we build a bunch of independent, isolated and reusable components and then compose them t build a complex user interface.Įvery react application has at least one component which we refer to as the root of the component, this particular component represents the internal applications and contains other child components. It is currently dominating the space of various libraries and frameworks for building user interfaces.Īt the core of all the react applications, there are components. It was developed at Facebook in 2011 and currently, it is the most popular and famous library for creating user interfaces. React is a javascript library for building very fast and interactive interfaces. Let's take a brief tour about "What is React js?" In this blog tutorial, we are going to set up and build react applications absolutely from scratch. ![]()
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