Node JS Interview Questions and Answers

Indiahires.in — Mon, 31 Aug 2020 17:21:13 +0000

Node JS Interview Questions

If you wish to make a career in Node JS, below are the top Node JS interview questions with answers which will make you interview-ready.

A comprehensive, community-driven list of essential Node js interview questions. Whether you’re a candidate or interviewer, these interview questions will help prepare you for your next Node.js interview ahead of time.

Basic understanding of Node JS

Node js can be used to build different types of applications, such as web applications, real-time chat applications, REST API servers, etc. Nonetheless, it is primarily used to create network programs such as web servers, similar to PHP, Java, or ASP.NET. Node js was created in 2009 by Ryan Dahl.

Node js is a run-time JavaScript environment developed on top of the Chrome V8 engine. Uses an event-driven, non-blocking I / O model. It’s lightweight and it’s so effective. Node js has an architecture module called npm.

Check all 21 questions here

Explain the basics of Node js
What is Event-driven programming?
What is “callback hell” and how can it be avoided?
How does Node JS handle child threads?
What is Event loop in Node JS work? And How does it work?
What is the difference between Asynchronous and Non-blocking?
What is Tracing in Node.js?
Difference between setTimeout(fn,0) vs setImmediate(fn)?
What is process.nextTick()?
What is the preferred method of resolving unhandled exceptions in Node.js?
How does Node.js support multi-processor platforms, and does it fully utilize all processor resources?
What are some of the most popular modules of Node.js?
What is EventEmitter in Node.js?
What are Streams in Node js?
What is typically the first argument passed to a Node JS callback handler?
What is REPL? What purpose it is used for?
What is the difference between readFile vs createReadStream in Node.js?
What's a crypt in Node js? How do you Cipher the protected information in Node.js?
What is the use of DNS module in Node.js?
What is a Callback function in Node.js?
What is the passport in Node.js?

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21 React js Interview Questions and Answers

Indiahires.in — Sun, 19 Jul 2020 17:25:58 +0000

React js Interview Questions and Answers for experienced software developer

If you’re an aspiring front end developer and are getting ready for interviews, then this https://www.indiahires.in is for you. This blog on Top 21 Questions for React Interviews is the perfect guide for you to learn all the concepts necessary to clear an interview with React. But before we continue with the questions of the reaction interview, let’s take a quick look at the demand and status of React on the market.

The JavaScript tools are slowly and steadily firming their roots on the marketplace and the demand for React certification is exponentially increasing. It is becoming increasingly difficult to choose the appropriate technologies to create an application or website. React is considered by others to be the fastest-growing Javascript framework.

check all 21 questions here

Compare and contrast developing ES5 and ES2015 (also known as ES6) react components. What are the pros and cons of using one or the other? Include notes on default props, initial state, PropTypes and DisplayName.
Explain the Virtual DOM and how React renders it to the DOM?
Compare and contrast the different lifecycle methods used in the React Component. How might understanding these help build certain interfaces/features?
What is the difference between state and props?
How would you create Higher Order Components (HOCs) in React?
What is the significance of keys in React?
What is the use of refs in React?
What are pure functional Components?
How can React handle or restrict Props to some types, or require some Props to exist?
What is prop drilling and how can you avoid it?
What is the StrictMode component and why would you use it?
What is the important architectural difference between a JavaScript library like React and a JavaScript framework like Angular? Why does that impact the decision to use one or the other for a project?
If you required a component to perform an action only once the component was initially made, how would you do that with a class object? And how are you going to accomplish this with a function component?
What are the most common approaches to styling a React application?
If you were working on a React application that was rendering a page very slowly, how would you be investigating and fixing the issue?
What is useState() and useEffect() in React?
What is the difference between a controlled component and an uncontrolled component?
How are you going to differentiate Redux from Flux?
What is the use of render() function in ReactJS?
Explain Redux and its components?
Explain React.Fragment, React.lazy and Suspense?

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Node JS Interview Questions and Answers

21 React js Interview Questions and Answers