Hiring a skilled ReactJS developer to add to your front-end developer's team is tricky. But following the interview process, you can find a proficient ReactJS developer in your tech family. You are aware that the success of projects rests on your ability to find the right developers.
This article will list some mandatory interview questions for hire ReactJS developers. Being an outsourcing company, the technical aspects of the company must be vital. So hiring ReactJS developers in India is challenging. Let's learn about the essential interview questions to hire ReactJS developers.
The below questions are among the fundamentals. And they cover the groundwork for understanding front-end JS technologies and ReactJS. 1) What is ReactJS? How does it differ from other JS frameworks?
ReactJS is a front-end open-source JavaScript library used to build interactive user interfaces. It has reusable code for UI components. React has a large community with many tools and package support.Unlike AngularJS and VueJS, ReactJS is not inflexible about the application's architecture.
2) What is a Component in React? Why is it essential?
Components are at the heart of all React applications. They are an essential part of user interfaces. While building applications with React, we build a bunch of independent, isolated, and reusable components and then compose them to build complex user interfaces. Every React application has at least one component, which refers to the root of the component.
3) What are props and states?
In a React component, the term "state" refers to a default data value that may vary over time (usually based on user actions that call for changes in a UI).
A React component's configuration is described using "props" (also known as properties). Props remain unchanged.
In conclusion, while props are not mutable (changeable based on user actions), the state is.
4) Which Component lifecycle practice have you used in previous projects? Component lifecycle techniques are functions a component may carry out at different stages of its lifespan. The easiest way to respond to a query is to recall a specific instance from a project you've worked on.
5) What is render () in React?
The render () function is available in every React component. Render () returns only one React element, the appearance of a native DOM component.
6) What is JSX in React?
JSX is a JavaScript XML that permits developers to write HTML in React. JSX is a syntax that simplifies coding and adds HTML to React.
7) What is Virtual DOM in React? React Element is a simple and straightforward JS object that maps to a DOM element. It is just an object DOM element in memory. As a result, React maintains a lightweight impersonation of the DOM element in memory, known as Virtual DOM.
8) What is Redux?
React uses the state management library define as Redux. Besides, React, other UI libraries also use Redux to store the data.
9) How would you debug an issue in React code? What debugging tools have you used?
As debugging is a critical part of the development phase, you must ask the ReactJS developer what tools they have used. There are two standard debugging tools. Ask them to explain them.
- Linters (eslint, jslint)
- Debuggers (React Developers Tool)
10) What are React's limitations?
React JS is a JavaScript library rather than a full-fledged framework. Therefore, it is only adequate for some projects.
For developers who haven't used JSX before, React's library introduces a new coding dimension. Still, it can take more time and expertise (beyond the initial learning period) to properly understand it (though it does have a gentle learning curve due to its similarity to HTML)
Finally, we've gone over the key questions to ask when hiring ReactJS developers. With the appropriate answers to these fundamental questions, you will hire a qualified and skilled developer for your team.
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