import React, { Component } from 'react'; class App extends React.Component { constructor() { super(); this.state = { displayBio: true }; } render() { const bio = this.state.displayBio ? ( <div> <p><h3>Javatpoint is one of the best Java training institute in Noida, Delhi, Gurugram, Ghaziabad and Faridabad. We have a team of experienced Java developers and trainers from multinational companies to teach our campus students.</h3></p> </div> ) : null; return ( <div> <h1> Welcome to JavaTpoint!! </h1> { bio } </div> ); } } export default App; To set the state, it is required to call the super() method in the constructor. It is because this.state is uninitialized before the super() method has been called.Output
Question
import React, { Component } from 'react'; class App extends React.Component { constructor() { super(); this.state = { displayBio: true }; } render() { const bio = this.state.displayBio ? ( <div> <p><h3>Javatpoint is one of the best Java training institute in Noida, Delhi, Gurugram, Ghaziabad and Faridabad. We have a team of experienced Java developers and trainers from multinational companies to teach our campus students.</h3></p> </div> ) : null; return ( <div> <h1> Welcome to JavaTpoint!! </h1> { bio } </div> ); } } export default App; To set the state, it is required to call the super() method in the constructor. It is because this.state is uninitialized before the super() method has been called.Output
Solution
This is a React.js code snippet. It defines a class component named App. In the constructor of the class, it calls the super() method to call the constructor of the parent class, which is React.Component. This is necessary before you can use this keyword in the constructor.
The state of the component is initialized with a single property displayBio set to true.
In the render method, it checks if displayBio is true. If it is, it assigns a JSX element containing a paragraph to the bio variable. If displayBio is false, bio is assigned null.
Finally, in the return statement of the render method, it returns a JSX element that contains a heading and the bio variable. This means that the paragraph will be displayed if displayBio is true, and nothing will be displayed if displayBio is false.
The component is then exported for use in other parts of the application.
Similar Questions
import React, { Component } from 'react'; class App extends React.Component { render() { return ( <div> <h1>Default Props Example</h1> <h3>Welcome to {this.props.name}</h3> <p>Javatpoint is one of the best Java training institute in Noida, Delhi, Gurugram, Ghaziabad and Faridabad.</p> </div> ); } } App.defaultProps = { name: "JavaTpoint" } export default App; Main.jsimport React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(<App/>, document.getElementById('app'));
import React from 'react';export function App(props) { return ( <div className='App'> <h1>Hello React.</h1> <h2>Start editing to see some magic happen!</h2> </div> );}// Log to consoleconsole.log('Hello console')
What is React
In react state can be accessed using ....................Athis.stateBthis.state()Cstate.current()DNone of the above
Hello World! should be enclosed in curly brackets like this {Hello World!}The JSX needs to be inside of a pair of <div> and </div>Component headline should not be exported.class is a reserved word in React/JavaScript and className should be used instead
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