React (JavaScript library) Quiz

What is React?

• A back-end programming language

• A front-end JavaScript library for building user interfaces

• A database management system

• A mobile application framework

What is the key advantage of React in terms of rendering?

• It rerenders all DOM elements every time

• It only rerenders the parts of the page that have changed

• It relies on server-side rendering for all updates

• It renders the entire page on each change

What are the two primary ways of declaring components in React?

• Server components and client components

• HTML components and CSS components

• Stateful components and stateless components

• Class components and functional components

What are React Hooks?

• Functions that manage server-side rendering in React

• Functions that handle routing in React applications

• Functions that let developers hook into React state and lifecycle features from function components

• Functions that let developers hook into React state and lifecycle features from class components

What is the purpose of the Virtual DOM in React?

• To handle server-side rendering exclusively

• To efficiently update the browser's displayed DOM by computing differences

• To render the entire page on each change

• To directly update the real DOM elements

When was the initial public release of React?

• 2013

• 2014

• 2016

• 2015

What is the name of the React component for measuring performance?

• ReactPerformance

• React.unstable_Profiler

• ReactProfilerAPI

• ReactProfiler

Which version of React introduced the support for Pointer Events specification?

• 16.3.1

• 16.5.0

• 16.4.0

• 16.6.0

What did Facebook announce on September 23, 2017, regarding the licensing of React?

• Switching to Apache License 2.0

• No change in licensing

• Re-licensing under a standard MIT License

• Introducing a new proprietary license

Which feature was added in React 16.8.0?

• Add React DevTools Profiler

• Fix an IE crash

• Add Hooks

• Support for Pointer Events specification