Frequently asked: React JS Interview Questions and Answers
If you want to get through the toughest of interviews, start practising the ReactJS interview questions and answers listed here. These are questions that will help you prepare for your ReactJS Interview for Reactjs development services providing company. Q1. How React works? How Virtual-DOM works in React? React creates a virtual DOM. When state changes in a component it firstly runs a “diffing” algorithm, which identifies what has changed in the virtual DOM. The second step is reconciliation, where it updates the DOM with the results of diff. The HTML DOM is always tree-structured — which is allowed by the structure of HTML document. The DOM trees are huge nowadays because of large apps. Since we are more and more pushed towards dynamic web apps (Single Page Applications — SPAs), we need to modify the DOM tree incessantly and a lot. And this is a real performance and development pain. The Virtual DOM is an abstraction of the HTML DOM. It is lightweight and...