Hiring skilled React.js developers has become quite challenging these days. Though the number of JavaScript engineers has steadily risen, not all candidates are well-versed in React.js. This calls for organizations to optimize their hiring strategies with proper candidate screening using assessment tests and conducting structured interviews to help identify skilled candidates who fit the company culture well.
React.js is an open-source front-end JavaScript library that was launched in 2013. Used for crafting compelling user interfaces for web applications, React.js is used across several industries, and it is the cornerstone of web development today.
React.js is easy for developers with a basic understanding of JavaScript. Writing and maintaining code is also easier with React.js than with regular JavaScript.
React.js applications are built using different components, each with logic and controls. So, the same elements can also be reused throughout the app, helping save time and money. It also means that developers can use parts of codes that have been written for other projects, as well as open-source codes for projects.
React.js has a virtual document object model, or VDOM, to depict code elements. The virtual DOM is an abstract form of the DOM, and it can identify changes made to the components of the code and render dynamically. The VDOM does not re-render the entire interface and only tweaks the parts that have been updated, which makes the process much more convenient and faster.
With fast rendering, React.js ensures that the page loads quickly, which helps it rank higher on search engine result pages. This is a great advantage for organizations as it can help improve their visibility significantly.
React.js involves one-way binding or data flow. This ensures that developers have greater control over the application. It also ensures that the parent elements are not affected whenever child elements are edited.
Hard skills are an essential requirement for any developer job role. Programmers can build complex web applications using React.js, but only if they possess the skills and experience to use React.js properly.
Though React.js is used for front-end development and SQLite is a query language for managing relational databases and back-end development, candidates should have the essential abilities to collate and filter results. Candidates should be able to use SQLite to manipulate databases based on different details.
In order to ensure that projects are done the right way on the first try and that the organization does not have to waste a lot of money and time on projects that take way too long, it is crucial to hire developers who write clean codes. Candidates should understand the YAGNI, SOLID, and DRY coding principles and follow them to create easy-to-understand, efficient code.
The ability to notice patterns and identify even the smallest of mistakes in long strings of code and memorize complex commands are essential skills that a React.js developer must possess. These abilities need attention to detail. Attention to detail is a skill that is often not given due importance, primarily when recruiting for tech-based job roles. Solving small problems is more accessible for individuals who can notice tiny details that seem out of place.
Critical thinking skills are crucial for solving problems effectively and meeting challenging requirements to improve applications. Developers with essential skills of thinking do not need to rely on guesswork, and they can also avoid making simple mistakes when writing code.
Organizations need to establish robust recruitment processes to thoroughly assess the skills and competencies of candidates. The process should comprise skills and aptitude assessment tests for screening applicants and structured interview processes, where every React.js interview question has a clear purpose behind it.
Once the applicants have been screened based on their skills and aptitude using relevant online assessment tests, the shortlisted candidates should be invited for React.js interview questions and answers rounds. The information that recruiters gain through the results of the assessment tests can be used to design personalized interview questions for React.js developers, which can help employers gain a holistic understanding of candidates and their likelihood of succeeding in specific job roles.
To answer this React.js interview question, candidates must understand that refs are often assigned to instance properties when components are being constructed. Candidates should also be able to explain how React.createRef() is used to create refs in React.js.
This React.js interview question requires candidates to list the advantages of using React.js for organizations. When candidates respond to this question, they may cover several benefits of using React.js, like how the library can be used to build high-quality user interfaces and create custom components.
Flux is a JavaScript architecture that operates on unidirectional data flows. Candidates should know that Flux offers several advantages for projects involving dynamic data, which can be updated effectively using Flux.
Candidates should be able to demonstrate their understanding of React Hooks. React Hooks’ advantages are that they enable developers to effectively handle the setup of side effects, share logic among various components, and enhance the readability of the component tree.
useState is used by developers to enhance the performance of their code by creating queues. The changes are not updated immediately. Candidates should know that the changes are not implemented directly to the state object by state and that the updates occur asynchronously.
An understanding that React.js refs can be used to access DOM elements is essential for React.js developers. Candidates should explain here that refs can be used to access an element they have created so the value of the child component can be changed.
To answer this React.js interview question, candidates should explain that useMemo() can be used by developers to cache the value of a variable along with dependency lists. They should also explain that useMemo() can also be used to avoid unnecessary re-renders and can be helpful in cases involving high processing amounts.
Here, candidates should be able to explain that props are passed to superconductors for accessing and using these .props in the constructor. When a constructor() function is implemented within a Reac.js component, super() is used to call the parent constructor.
Arrow functions can be used in class properties to avoid binding. Candidates should be able to convey the same through their answers. They can also add how class properties are a relatively new feature, and developers are required to enable transform-class properties to use them.
Candidates should explain that for handling events, they should be named using camelCase and not lowercase and that when JSX is used, a function is passed as the event handler instead of a string.
Hooks were introduced in React 16.8. They enable developers to use state and other React.js features without writing a class. The feature is called Hook, as it allows developers to ‘hook’ into the features of React.js.
state objects are planned JavaScript objects that developers use in React.js to show information about the current properties of components. state objects can be managed in the component, but the entire component will re-render if changed.
props objects are generally ordinary objects, and candidates should be able to explain that these objects abide by strict properties and that components cannot change their objects.
Class components refer to a simple class that includes several functions. These components accept props as arguments and return basic React.js elements. Render functions must be created to use class components, which return React.js elements.
Components refer to reusable pieces of code that can be used to return React.js elements rendered to a page. Components can return strings, numbers, arrays, and even other components.
A specific outline and description of job roles can guide building a list of coding and interview questions for React.js developers. The job description can help recruiters determine the criteria candidates should meet and the skills and competencies they should possess so they can tailor the React.js coding and interview questions accordingly.
Not only can relevant skills assessment tests help screen candidates based on required skill sets, but they can also help build a list of questions to ask specific candidates. For instance, if a candidate’s assessment results show they lack technical skills related to React.js components, recruiters can include questions about React.js components to better understand their skills.
At the beginning of the interview, after introducing themselves, recruiters can explain the job responsibilities that come with the role in detail. This will help candidates match themselves to the responsibilities and enable them to ask any questions about the job role.
The first few questions should help recruiters understand candidates’ work-related experience. These React.js interview questions and answers can help recruiters understand how interested candidates are in the job role and also offer them a new opportunity to evaluate the potential performance of candidates in the position in question if they are hired.
Ensuring consistency between every possible React.js interview question is vital throughout the interviews. Ensuring that a majority of the questions being asked are the same for all candidates can help recruiters compare different candidates and ensure fairness in the recruiting process. Follow-up questions can differ for all candidates based on their answers, but the main list of React.js interview questions should remain the same.
Open-ended questions allow recruiters to get more information from candidates. Close-ended questions with ‘yes’ and ‘no’ answers should be avoided completely. However, while using close-ended questions in the interview, following up with another question is necessary to elicit more details from candidates.
Toward the end of the interview, invite the candidate to ask questions. Inverting the interview process can help candidates determine whether they are suitable for the job role in question. Be prepared to answer the questions honestly and ensure you have all the information candidates need before the interview starts.
It is a good practice to thank candidates for their time and tell them when to contact them about the interview results. Such practices showcase courtesy and help enhance the overall candidate experience.
This list of React.js interview questions and answers can help streamline recruitment processes and make it easy for recruiters to identify and hire top React.js developers. Use these questions as a guide, picking relevant interview questions to build a list for evaluating candidates based on the specific hiring requirements of the organization. Do not forget to integrate skills assessment tests into the interview process to screen suitable candidates from the pool of applicants.
Mercer | Mettl offers a range of recruitment solutions that enable thorough skills assessment and structured interview processes. The React.js test by Mercer | Mettl is a comprehensive skills assessment that can help recruiters make informed decisions based on candidates’ competencies and job readiness. The assessment not only evaluates cursory domain knowledge but also dives deep into the most critical aspects of React.js development to screen suitable candidates. Apart from this, Mercer | Mettl also offers a wide range of aptitude and cognitive abilities assessments and coding simulators that can help recruiters ascertain if a candidate is a good fit for the job role and the company. Even after optimizing and perfecting the recruitment strategy for hiring React.js developers, don’t forget that recruitment is a process that can always be re-evaluated and improved.
Originally published April 14 2024, Updated April 14 2024
Harsh Vardhan Sharma, with 6 years of content writing expertise across diverse B2B and B2C verticals, excels in crafting impactful content for broad audiences. Beyond work, he finds joy in reading, traveling, and watching movies.
Hiring a coder requires HRs to go beyond conventional hiring practices and assess the candidate on both knowledge and hands-on skills. A holistic suite of assessments and simulators, used in conjunction, can simplify the technical hiring process and better evaluate programmers and developers.
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Cognitive Competencies
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Domain Competencies
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