React is one of the particular JavaScript libraries. React has extended popularity, as it is simple and operates in highly performing applications.

If you're skilled in JavaScript and you are trying to build a web application, this article introduces you to the possible React JS jobs. Also, you can have a look at the Reactjs interview questions and answers. Learn the ways that increase your chances to get hired as a React developer or in any software development job in Pakistan. For more information on programming and computing interview questions, kindly do visit these links 

Let's Practice some challenging programming interview questions

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Let's start exploring the essential React.js. Interview questions and answers that can operate during your hiring process.

Top 10 Common React js Interview Questions

These are samples of React js questions and answers that you can find in similar blogs. However, your employer might ask you a different genre of questions that put you in a specific situation to see how would you react.

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Q1: What is meant by React? How is it different from other JS frameworks?

This question requires the candidate to give information about React and what makes it different from any other framework. In other words, this question is designed to test the candidate's knowledge about the JavaScript system from a specific perspective which is to React.

Answer: React is an open-source JavaScript library, created by Facebook to get a higher interactive rate in web and mobile applications. What makes React different from other JS frameworks is its small library based on building UI components. This feature makes React different from many other JavaScript frameworks.

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Q2: What are the significant features of React?

Answer: React is excellent for building complex web and mobile UI. It also helps in making reusable UI components. A programmer makes use of the virtual DOM instead of the real DOM-it is based on server-side rendering.

Q3: Explain the Virtual DOM and how it works?

It is one of those react js interview questions that your hiring manager asked to know your understanding of basic concepts.

Answer: A virtual DOM is a copy of the real DOM. It is a lightweight JS object. It operates in three simple steps:

• Step 1 – re-rendering the entire UI in a Virtual DOM representation as soon as there are some underlying data changes.

• Step 2 – Calculating the difference between the previous DOM representation and the new one resulting out of data changes.

• Step 3 – it contributes to the updating of the real DOM.

Q4: What is the difference between Real DOM and the Virtual DOM?

There are many differences between the Real DOM and the Virtual DOM. They are relevant when it comes to:

Different DOM manipulation costs: Real DOM supports costly DOM manipulation, while the virtual Dom has a cheaper DOM manipulation.

• Update: When an element updates, Real DOM creates a new DOM. However, a virtual DOM doesn't do the same.

• Speed: Both DOMs have different update speed. On the one hand, Real DOM updates slowly. Virtual DOM on the other updates faster.

• HTML: Real DOM can directly update HTML, while virtual DOM cannot update HTLM immediately.

• Memory Wastage: Concerning memory, Real DOM causes a lot of memory wastage, while there is no memory wastage for virtual DOM.

Q5: List the various lifecycle steps of React components.

It is among the most common react interview questions, so you better memorize its answer.

Answer:

There are 7 React component types in a React life cycle. There is :

1. componentDidMount() – 

2. componentDidUpdate() – 

3. componentWillMount() – 

4. componentWillReceiveProps() – 

5. componentWillUnmount() – 

6. componentWillUpdate() – 

7. shouldComponentUpdate() – 

Q6: React contains something called state. What is it and how can we use it?

The state contains the data source of React components. It is considered responsible for determining React component behavior and rendering. The state creates dynamic and interactive components as well.

Q7: How does the React Router differ from conventional routing?

Answer: The React Router differs from conventional routing in terms of URL changes, navigation, and pages.

Q8: How does the state differ from props in React?

Answer: Props make it easy for a parent component to change value. To maintain the unidirectional data flow, a child component is restricted from sending amount back to its parent component. This also helps in rendering the dynamically generated data. Therefore, React allows changes inside child components, through props and not the state.

Q9. How will you distinguish Redux from Flux?

One of the popular Reactjs interview questions is this one. Know how to answer it.

Answer: Many features establish the difference between Redux and Flux. Flux includes multiple Stores per app. However, Redux consists of a single Store. It keeps everything in one region of the app, instead of placing state information in multiple Stores across the application.

Q10: What is Props in React?

Answer: A prop is a contraction for Properties in React. Throughout the application, props are passed down from the parent components to the child components.

Reactjs jobs 

React js. Jobs brings many roles:

• Developing new user-facing features using React.js.

• Building front end libraries.

• Making  software and hardware designs of high-quality code.

If you think that your employer might ask you some JavaScript question, take a look at this article:

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Programming Jobs in Pakistan 

Programming jobs in Pakistan can take different labels. If you log into the Pakistani employment website like pk.fratres.net, you can find various programming jobs which require you to have some knowledge and experience of  Reactjs, JavaScript, OOPS, .NET and many similar languages. 

Software development jobs

Pakistan Software development jobs are typically similar to programming jobs. For example, many companies search for software programmers, Software engineers, front-end developers and many other jobs that are based on coding.

Interviewing a React developer involves more than testing React knowledge and JavaScript levels. If you are interested in Programming jobs, Software development jobs, do check this present article to cover some essential points that a developer might find while applying for Reactjs jobs in Pakistan.