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 ...

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() { ...

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).

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 ...

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 ...

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.

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 ...

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 ...

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 ...

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 ...

Pure Components in React are the components which do not re-renders when the value of state and props has been updated with the same values.If the value of the previous state or props and the new state or ...

React 16.8 introduces the concept of higher-order components.A higher-order component is a function that takes a component and returns a new component. A higher-order component (HOC) is the advanced technique in React.js for reusing a component logic.Higher-Order Components ...