React interview questions commonly feature at Java developer interviews, mainly front-end interviews, as the framework helps perform a range of front-end programming tasks. This essentially means that if you’re appearing for a technical or coding interview at a top company, knowing answers to common React interview questions is important if you wish to get ahead of the stiff competition.
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In this article, we’ll look at some core features of React through some popular React interview questions and answers. Read on to learn more.
Here’s what we’ll discuss in this article:
In this section, we’ll look at some common React interview questions along with answers.
This is one of the most common React interview questions asked at developer and software engineering interviews. Some benefits of using the React framework include:
Some limitations with React are:
This is another popular React interview question asked at software engineer interviews, especially front-end developer interviews. Some common features of the React framework are:
React makes use of Server-side Rendering
Data binding is a prime feature in React, and it follows a unidirectional data flow
React makes of the Virtual DOM instead of a Real DOM
Q4. What can’t JSX be read by browsers?
Components are blocks of code and are the basic building blocks of React’s UI. The two types of components in React are - Functional Components and Class Components.
Routers essentially specify multiple routes when users enter a URL. If the URL matches any route specified in the Router, users are redirected to that particular URL. Routers are needed to create multiple routes so users can be redirected to appropriate pages.
Redux is an elaborate library used for front-end development. Developers extensively use it to build a range of applications and software. Applications built using Redux can run on multiple environments and are easy to test.
This is another popular React interview question asked at technical interviews at top companies.
State management: The application state is stored within a state tree or an object in a single store. This makes it extremely easy to track changes made to application code while also assisting seamless debugging.
Redux uses Pure functions: Pure functions are functions whose real value is dependent on the value of their arguments. Pure functions are required to understand how state trees are transformed.
Flux is an architectural setup that controls derived data and facilitates communication between different components through a central store. Flux enforces a uni-directional data flow and has complete authority over the central store. If data needs to be updated in multiple places in the application, it has to be done through Flux.
The two main advantages of using Flux are that it makes the application more stable by effectively performing data updates. By ensuring uniformity, it also prevents runtime errors that may occur due to incorrect code updations.
Pure components in React maintain code simplicity and the application’s performance. Pure components in React can replace any component that possesses a render().
Higher-Order Components, commonly referred to as HOCs, are pure components in React that wrap other components within them. They enable component logic to be reused whenever necessary. HOCs are capable of wrapping dynamically provided child components in React.
With HOC, you can:
Synthetic events are objects that behave like cross-browser wrappers. They are used to combine behaviors of multiple browsers into a single API. They ensure that events display and exhibit consistency across different browsers.
References in React help to store a particular element or component. The component is then returned using the render() function. References come into use when DOM measurements need to be used or when certain methods need to be added to components.
Take a look at some React Native Interview Questions for tech interview preparation.
In this section, we’ll look at some additional React Interview Questions that you can practice for your upcoming technical interview.
Here’s a list of top ReactJS Interview Questions and Answers for you to practice.
The React interview questions listed above will help you understand the types of questions you can expect in your upcoming Java interview. Knowing how to use popular tools like React, Spring, and others to design and develop Java programs is critical for standing out in technical interviews.
Q1. What type of React interview questions can you expect in technical interviews?
React interview questions that you can expect in tech interviews include React components, UI, features of React, events, lifecycle methods, stateful and stateless components, props, JSX, and embedding components, among other concepts.
Q2. Are React interview questions asked in Python interviews?
Q3. What type of Templating does React use?
React employs Inline Templating. This is one of the reasons why it is slightly complex to code within the React framework.
Q4. Are React Interview Questions asked at Design interviews at FAANG companies?
Yes, if you are a Java developer, you can very well be asked React interview questions at design interviews, primarily because React is one of the major frameworks used for front-end development.
Q5. What is the need for using the render() function in React?
The render() function in React is used to return single elements that represent native DOM elements. The render() function returns the same value whenever called.
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