React JS Interview Questions
If you're looking for React JS Interview Questions and Answers? If YES, then this blog is for you!
There are a lot of opportunities from many reputed companies in the world. According to research, React JS has a market share of about 7.3%.
Interested to learn more about React framework - Then check out our Best React Course to gain expertise to build React JS Applications.
Mindmajix designed this blog with the latest 2020 updated ReactJS Interview Questions and Answers for freshers and experienced professionals. These React interview questions will help you to crack the React interview easily. Let's get into them.
Top React JS Interview Questions (Updated - 2020)
Here top ReactJS interview questions:
What is React?
Why React is used?
How React works?
What are the features of ReactJS?
What are the Advantages of React JS?
How is React different from AngularJS?
How ReactJS framework is different as compared to others?
What are the life Cycles of ReactJS?
ReactJS Interview Questions and Answers -For Beginners
Q1: What is React?
Q2: Why React is used?
Ans: The following reasons make one to use React for building User Interfaces (UI), and they are:
Easy to learn nature
Also Read: Full Stack Developer Interview Questions
Q3: How React works?
Ans. Below is the sequence of steps which gives an idea about how does react work
Firstly the react runs the diffing algorithm to identify the changes that are made in the virtual DOM.
Next step is reconciliation, this is used to update the DOM as per the new features.
Now, the virtual DOM, which is lightweight in nature and is detached from the specific implementation of the browser.
Followingly the ReactElements which are present in virtual DOM are used to build basic nodes.
Finally, if the ReactComponent changes the state; the diffing algorithm runs faster and identify the changes. After identification, it automatically updates the DOM with the change difference.
Q4: What are the features of ReactJS?
Ans: The features of React JS are as follows:
- React improves SEO performance
- React acts as a standard for mobile app development
It provides a transition process as an ideal solution for both mobile and web applications for building rich user interfaces.
- React makes the process of writing components easier
Using React along with JSX will make you write components and code efficiently and clearly.
- React increases efficiency
As the React boost the efficiency of components by reusing them. This is the reason why it is considered as an ideal feature of React. It is considered as the most reusable system component.
- React ensures stable code
It ensures the stability of the code of an application by making use of downward dataflow.
Q5: What are the Advantages of React JS?
Ans: The advantages of React are as follows
Usage of JSX makes easier to read and write code
Improves the performance of applications with the use of virtual DOM
Provides an easier way to integrate with frameworks
It can be shared and rendered both on server and client-side
Writing integration and unit tests can be made smother by using tools
For more Interesting questions visit here: Top React JS Interview Questions
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