React (JavaScript library) In computing, React (also known as React.js or ReactJS) is a JavaScript library for building user interfaces.
It is maintained by Facebook and a community of individual developers and companies.
React can be used as a base in the development of single-page or mobile applications.
What is virtual DOM? How does react use the virtual DOM to render the UI?
Question
sagar
Virtual DOM is a concept where a virtual representation of the real DOM is kept inside the memory and is synced with the real DOM by a library such as ReactDOM.
DOM manipulation is an ...
Why does React use className over class attribute?
Question
sagar
class is a keyword in javascript and JSX is an extension of javascript. That's the principal reason why React uses className instead of class. render() { ...
What is the use of a super keyword in React?
Question
sagar
The super keyword is used to call the constructor of its parent class.This is required when we need to access some variables of its parent class(and call functions on an object’s parent).
How to do conditional rendering in react?
Question
sagar
Conditional rendering in React works the same way conditions work in JavaScript.Use JavaScript operators like if or the conditional operator to create elements representing the current state, and let React update the UI to match them.Using conditional statements ...
What are children? or What are children prop?
Question
sagar
Children's props are used to pass components to other components as properties.You can access it by using {props. children}
The children, in React, refer to the generic box whose contents are unknown until they’re passed ...
What Are PropTypes In React?
Question
sagar
Prior to React 15.5.0, a utility named PropTypes was available as part of the React package, which provided a lot of validators for configuring type definitions for component props. It could be accessed with React.PropTypes.
What do you understand from “In React, everything is a component.”
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sagar
Components are like functions that return HTML elements. Components are the building blocks of a React application’s UI. These components split up the entire UI into small independent and reusable pieces. Then it renders each of these components ...
When do you use refs in ReactJS?
Question
sagar
Refs are created using React.createRef().Refs are attached to input elements using the ref attribute on the element inquestion.Refs are often used as instance properties on a component. The ref is set in the constructor (as shown above) and ...
what are controlled and uncontrolled components in react JS?
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sagar
In a controlled component, the form data is handled by the state within thecomponent, and in uncontrolled components where form data is handled by the DOM itself.
Controlled Component
In a controlled ...
Difference between React Pure Component vs React Component?
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sagar
The biggest difference between React pure component vs a regular React component is that a React component doesn’t implement shouldComponentUpdate() by default. On the other hand, React pure component does implement shouldComponentUpdate() by default, and by performing a ...