#Best REACT JS interview Questions

[srishticampusposts]

Top 10 React JS Interview Questions for 2025

As the demand for skilled React developers continues to rise, it's essential to prepare for interviews effectively. As you prepare for interviews in 2025, it's vital to stay updated with key concepts and best practices. This blog covers the essential React JS interview questions and answers, perfect for those looking to enhance their skills through React JS training.

1. What are the main features of React?

React is known for its component-based architecture, virtual DOM for optimized rendering, one-way data binding, and hooks for managing state and side effects. These features make it a powerful choice for building dynamic web applications.

2. Explain the concept of Virtual DOM.

The Virtual DOM is a lightweight copy of the actual DOM. React updates the Virtual DOM first and then efficiently syncs the changes to the real DOM. This process minimizes direct manipulations, resulting in faster updates and improved performance.

3. What are hooks in React?

Hooks are functions that let you use state and other React features without writing a class. Key hooks include `useState`, `useEffect`, and `useContext`, which facilitate managing state and side effects in functional components.

4. How do you manage state in React?

State in React can be managed using the `useState` hook for local component state or by using libraries like Redux or Context API for global state management. Understanding when to lift state up is crucial for effective state management.

5. Can you explain the lifecycle methods of a React component?

Lifecycle methods allow you to hook into specific points in a component's life. Key methods include `componentDidMount`, `componentDidUpdate`, and `componentWillUnmount`. With hooks, you can replicate these lifecycle methods using `useEffect`.

6. What is the purpose of keys in React?

Keys help React identify which items have changed, are added, or are removed. Using unique keys improves performance during re-renders and helps maintain component state across updates.

7. How does React handle forms?

React handles forms using controlled components, where form data is handled by the component's state. You can use the `onChange` event to update the state as users interact with the form elements.

8. Explain the difference between state and props (properties).

State is a component's local data storage, while props are used to pass data from parent to child components. Props are immutable within the child component, while state can be modified.

9. What are higher-order components (HOCs)?

HOCs are functions that take a component and return a new component, adding additional functionality. They are commonly used for code reuse, such as implementing authentication or logging.

10. Why is React considered efficient?

React's efficiency comes from its virtual DOM and reconciliation process, which minimizes the number of direct updates to the real DOM. This leads to better performance, especially in applications with dynamic content.

11. What is the Context API in React?

The Context API is a feature in React that allows you to share state across the entire application without having to pass props down manually at every level. It provides a way to create global variables that can be accessed by any component, making it ideal for theming, user authentication, or managing application settings. To use it, you create a Context object, wrap your component tree in a `Provider`, and consume the context with `useContext` or a `Consumer` component.

12. How can you optimize performance in a React application?

-Performance optimization in React can be achieved through several techniques, including:

-Code Splitting: Use dynamic imports to split your code into smaller chunks, which can be loaded on demand.

-Memoization: Utilize `React.memo` for components and `useMemo` or `useCallback` for functions to prevent unnecessary re-renders.

-Pure Components: Use `PureComponent` or `shouldComponentUpdate` to prevent re-rendering when props or state haven’t changed.

-Lazy Loading: Implement lazy loading for images and components to improve initial load time.

-Efficient State Management: Avoid lifting state unnecessarily and prefer local state management when feasible.

Being well-prepared for your interview can make a significant difference in landing your desired job in React development. To further enhance your skills, consider joining the best React JS training in Trivandrum. They offer comprehensive courses that cover everything from the basics to advanced concepts.

[reactjsmarathahalli]

AchieversIT: Your Gateway to the Best React JS Training in Marathahalli

In the bustling tech hub of Marathahalli, mastering React JS has become a crucial skill for web developers aiming to build modern, interactive web applications. If you're searching for the best React JS training institute in Marathahalli, AchieversIT is your ultimate destination. Our institute is renowned for providing top-notch training that equips you with the skills and knowledge necessary to excel in React JS development. Let's delve into what makes AchieversIT the best choice for React JS training in Marathahalli.

Expert Instructors and Comprehensive Curriculum AchieversIT prides itself on having a team of expert instructors who are industry leaders in React JS development. Their extensive experience and deep understanding of the technology ensure that our training is not only comprehensive but also at the forefront of industry trends. Our curriculum covers a wide range of topics, from React basics to advanced concepts like state management, hooks, and Redux, providing you with a solid foundation in React JS.

Hands-On Learning and Real-World Projects We believe in a hands-on learning approach that allows you to apply theoretical concepts in practical scenarios. Our React JS training includes a variety of hands-on exercises, coding challenges, and real-world projects that simulate actual development environments. This practical experience not only reinforces your learning but also prepares you for real-world React JS development challenges.

Personalized Attention and Mentorship AchieversIT understands that each student has unique learning needs. That's why we maintain small class sizes to provide personalized attention and mentorship. Our instructors are dedicated to your success and are available to answer your questions, provide feedback, and guide you through your learning journey. Whether you're a beginner or an experienced developer, we tailor our training to your skill level and pace.

Career Development and Job Placement Assistance Our commitment to your success extends beyond training. AchieversIT offers comprehensive career development services, including resume building workshops, interview preparation sessions, and job placement assistance. We have a strong network of industry connections in Marathahalli, ensuring that you have access to a wide range of job opportunities in React JS development.

Collaborative Learning Environment Enrolling at AchieversIT connects you with a vibrant learning community of like-minded individuals passionate about React JS and web development. Our collaborative learning environment fosters interaction, collaboration, and knowledge sharing among peers. You'll have the opportunity to collaborate on projects, participate in group discussions, and learn from industry experts, enhancing your learning experience and expanding your professional network.

Conclusion: Choose AchieversIT for the Best React JS Training in Marathahalli In conclusion, AchieversIT offers the best React JS training in Marathahalli, combining expert instructors, comprehensive curriculum, hands-on learning, personalized attention, career development support, and a collaborative learning environment. Whether you're starting your journey in React JS or looking to enhance your skills, AchieversIT provides you with the tools and resources to succeed. Join AchieversIT today and unlock your potential in React JS development!

[pankaj-sharmaa]

React JS is a popular open-source JavaScript library and used for building user interfaces, particularly for single-page applications. If you are a fresher and wants to know more about the fundamental concepts of React JS then join Best React JS Course.

[techtalksonthego]

React Developer Technical Assessment Test for Hiring: Best Practices

In the competitive world of web development, hiring the right React developer can be a game-changer for your projects. ReactJS, with its component-based architecture and virtual DOM, has become one of the most popular libraries for building modern web applications. To ensure you find the best fit for your team, conducting a well-structured react technical test is essential. In this article, we will explore the best practices for designing a React Developer Technical Assessment Test that effectively evaluates a candidate's React skills, problem-solving abilities, and coding proficiency. By following these practices, you can identify top-notch React developers who will contribute to the success of your projects.

Where to Find Qualified React JS Developers?

Online Job Boards and Platforms: Start your search by posting job listings on popular platforms such as LinkedIn, Stack Overflow, and Indeed. These platforms have a vast pool of qualified ReactJS developers actively seeking opportunities.

Freelance Platforms: If you require freelance or contract ReactJS developers, platforms like Upwork, Toptal, and Freelancer offer a wide range of skilled freelancers.

Dedicated Developer Platforms: Consider using platforms like Hired, Gigster, or Gun.io, which specifically connect businesses with top-tier developers after a rigorous vetting process.

Tech Meetups and Hackathons: Offline events like tech meetups and hackathons can be great opportunities to network and connect with passionate and proactive ReactJS developers in your local community.

How to Hire a ReactJS Developer?

Determine Your Project Requirements: Clearly define your project's scope, technology stack, and specific ReactJS skills required to find the right fit for your project.

Conduct a React Assessment Test: Use a well-designed React assessment test to evaluate candidates' technical prowess, problem-solving abilities, and practical application skills. Include scenarios relevant to your project to assess real-world capabilities.

Conduct a Technical Interview: Follow up the assessment test with a technical interview to delve deeper into candidates' problem-solving approach, communication skills, and project experiences.

Review Past Projects and Experience: Examine candidates' portfolios and past projects to assess their coding quality, problem-solving capabilities, and domain expertise.

Finalize the Contract: After shortlisting promising candidates, finalize the contract with clearly defined terms, project scope, and compensation details.

Top ReactJS Interview Questions

Basic Understanding and Knowledge Questions:

What is JSX, and how is it different from standard JavaScript?

Explain the differences between functional and class components in React.

Elaborate on the purpose and advantages of React Hooks.

Practical Application and Problem-Solving Questions:

Develop a React component that fetches and displays data from an API.

Describe your approach to managing state in a complex React application.

Discuss the benefits and drawbacks of using Redux for state management.

Questions Specific to Your Project:

How would you implement [specific feature relevant to your project] using React?

Have you worked with [specific technology or library used in your project] in your past projects?

React Assessment Test-Based Discussion

Defining the Test Objectives:

Clearly outline the objectives of the React assessment test and the specific skills you aim to evaluate.

Aligning Test Objectives with Job Requirements:

Ensure that the test questions align closely with the ReactJS role's necessary skills.

Assessing Problem-Solving Skills and Knowledge:

Include coding challenges and real-world scenarios to assess candidates' ability to handle practical problems.

Emphasizing Practical Coding Tasks:

Prioritize hands-on coding tasks to evaluate candidates' practical skills.

Designing the Test

Choosing Problems and Setting Time Limits:

Select problems that challenge candidates within a reasonable time frame.

Balancing Theoretical Questions and Practical Coding Tasks:

Achieve a balance between theoretical questions and coding challenges to assess both knowledge and application.

Including Real-World Problems:

Integrate real-world scenarios to evaluate candidates' approach to authentic challenges.

Test Content

Focus on Core Concepts:

Assess candidates' understanding of fundamental ReactJS concepts, such as JSX, components, and props.

Incorporate Real-World Scenarios:

Present problems that reflect real-life challenges faced by developers.

Assess Coding Skills:

Include coding exercises to test a candidate's ability to write clean, efficient, and maintainable code.

Implement Time Constraints:

Set appropriate time limits to evaluate candidates' time management skills.

Include Domain-Specific Challenges:

Incorporate relevant challenges to assess candidates' domain-specific knowledge, if applicable.

Managing the Process

Choose the Right Platform:

Select a suitable platform or testing environment to administer the React assessment test.

Set a Regular Review for Biased or Discriminatory Questions:

Ensure the test questions are unbiased and free from discriminatory elements.

Pilot Testing:

Conduct a pilot test with your team to identify and rectify any issues with the test before candidate evaluations.

Conducting the Test

Providing Clear Instructions:

Furnish candidates with clear instructions for taking the React assessment test, including time limits and specific requirements.

Ensuring a Fair and Consistent Testing Environment:

Guarantee that all candidates have an equal opportunity to take the test under fair conditions.

Monitoring the Test:

Monitor the assessment process to address any technical issues that may arise promptly.

Evaluating the Test

Grading Rubric:

Create a grading rubric to evaluate candidates consistently and fairly.

Assessing Clean and Efficient Code:

Evaluate candidates based on their ability to produce clean, well-organized, and efficient code.

Understanding of React Principles:

Gauge candidates' understanding of React principles and best practices.

Problem-Solving Skills:

Assess candidates' problem-solving skills based on their approach to and resolution of given challenges.

Providing Constructive Feedback:

Offer constructive feedback to candidates, regardless of the outcome, to assist them in improving their skills.

Conclusion

Designing an effective Technical Assessment Build with React is crucial for making informed hiring decisions and building a skilled development team. By aligning the test objectives with job requirements, including practical coding tasks and real-world scenarios, and providing constructive feedback to candidates, you can ensure a fair and thorough evaluation process. Remember that an ideal React developer should not only possess strong React skills but also demonstrate problem-solving abilities, clean coding practices, and a deep understanding of React principles. Implementing these best practices will help you attract and hire talented React developers who will drive innovation and excellence in your web development endeavors

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[react-development-krishna]

How to Find a React Developer with UI/UX Skills?

React has become one of the most popular JavaScript libraries for building dynamic and interactive user interfaces. As web applications become increasingly sophisticated, the demand for skilled React developers who possess UI/UX skills is on the rise. Finding the right React developer who can not only write robust code but also design intuitive and visually appealing interfaces can be a challenging task. In this comprehensive guide, we will explore various strategies and best practices to help you find a React developer with UI/UX skills who will elevate your web application to new heights.

1. Define Your Requirements

Before starting your search for a React developer with UI/UX skills, it is crucial to define your project's requirements clearly. Outline the scope of the project, desired features, and the level of expertise needed in React and UI/UX design. Additionally, consider factors like project duration, team collaboration, and budget. Having a clear understanding of your requirements will enable you to target the right candidates.

2. Job Descriptions and Postings

Crafting a compelling and detailed job description is essential for attracting the right candidates. The job description should highlight the core skills required, such as React proficiency, knowledge of front-end technologies, and UI/UX design experience. Clearly state the level of expertise you expect and any specific projects the candidate will be involved in.

Ensure that the job posting is well-distributed across relevant platforms, such as job boards, developer communities, social media, and tech forums. Additionally, consider leveraging industry-specific platforms or attending tech conferences to reach out to potential candidates directly.

3. Review Portfolios and Previous Projects

One of the most effective ways to assess a React developer's UI/UX skills is by reviewing their portfolios and previous projects. Look for examples of web applications they have built using React, and assess the quality of the user interfaces they have designed. Analyze how they handle responsiveness, interactivity, and overall user experience.

When reviewing portfolios, pay attention to the diversity of projects they have worked on. A developer with experience in various industries and application types will likely bring a broader perspective and versatility to your project.

4. Conduct Technical Assessments

To evaluate a React developer's coding proficiency, consider conducting technical assessments. These assessments can range from simple coding challenges to more comprehensive take-home projects. You can find ready-made coding challenges or create one tailored to your specific project requirements.

Additionally, consider conducting code reviews of the candidate's previous projects to gain insight into their coding practices, code structure, and adherence to best practices. Ensure that the technical assessments are relevant to your project and focus on React-related tasks.

5. Evaluate UI/UX Design Skills

Assessing a React developer's UI/UX skills requires a different approach from technical assessments. You can request candidates to present their design process, wireframes, and mockups for past projects. Evaluate their ability to create visually appealing and user-friendly interfaces that align with modern design principles.

Ask candidates about their understanding of design systems, user research, and usability testing. A developer who can incorporate UI/UX principles into their React development process is more likely to create intuitive and engaging user experiences.

6. Behavioral Interviews

Apart from technical skills, a React js developer with UI/UX skills should be an effective communicator and a collaborative team player. Conduct behavioral interviews to gauge their problem-solving abilities, communication skills, and adaptability.

Ask questions about how they handle project challenges, their experience working in teams, and their approach to learning new technologies and design trends. Assess their ability to understand user requirements and how they translate those into effective UI/UX implementations.

7. Test Soft Skills and Cultural Fit

In addition to technical and design skills, consider the soft skills and cultural fit of potential candidates. A React developer with UI/UX design skills should be able to work effectively with other team members, understand and align with your company's values and work culture, and be receptive to feedback and constructive criticism.

Conduct informal conversations or social events to interact with potential candidates in a more relaxed setting. This can help you get a better sense of their personality and how well they would integrate into your existing development team.

8. Engage in Remote Hiring

In a globalized workforce, you are not restricted to hiring locally. Embrace the possibility of remote hiring to access a broader talent pool of React developers with UI/UX skills. Remote developers can bring fresh perspectives and diverse experiences to your team while reducing the limitations imposed by geographical boundaries.

Use video interviews and collaboration tools to effectively communicate and assess remote candidates. Additionally, consider offering a trial period to evaluate their work compatibility with your team and project.

Conclusion

Finding a skilled React developer with UI/UX skills requires a thoughtful and well-structured hiring process. By defining your project requirements, crafting compelling job descriptions, reviewing portfolios, conducting technical and design assessments, and evaluating soft skills, you can identify the ideal candidate who will bring value to your development team and elevate your web application's user experience. Embrace remote hiring to access a broader talent pool and remember to consider not only technical proficiency but also the candidate's ability to collaborate and fit into your team's culture. With a robust hiring process in place, you can find the perfect React developer with UI/UX skills to bring your web application to life.

[spectricssolutions]

What is React Js Internship and Why Does it Matter?

The use of React JS JavaScript library is significant in the development of modern user interfaces. Likewise, social media and streaming video services like Facebook, Instagram, Netflix, and Airbnb all use it to build dynamic, quick, and scalable websites. Therefore, a React JS internship at Spectrics Solutions can provide you with valuable experience in the field. In addition, you will get the opportunity to learn from leading professionals in the field.

Why and how to thrive in a React JS internship are the topics of today's post. So, let’s dive deep.

Insights Into React JS

First, if you're a student interested in learning React JS and gaining expertise in developing user interfaces, an internship program is a must.

Likewise, students can jumpstart their careers in web development and open up countless doors by participating in a React JS internship program.

The React JS logo is instantly recognizable to any programmer or computer nerd. Similarly, a blue and white atom with two black rings serves as the logo. In addition, the style is representative of the fundamental ideas behind React JS, and it is both straightforward and beautiful.

Advice for Thriving in Your React JS Internship

If you want to advance your web developer career. Likewise, an internship focused on React JS could be a game-changer. It's a great way to gain experience in your field by following these tips:

Don't Wait Around

Ask for clarification. Then, provide suggestions. Likewise, offer to take on more duties. 

Welcome Feedbacks

Being receptive to comments from your supervisor. Similarly, coworkers demonstrate motivation and a desire to grow. Hence, you can use this to sharpen your development abilities and advance in your career.

Collaborate

Developers need to be able to work well with others, therefore the ability to collaborate is crucial. Don't be reluctant to pitch in on team efforts and share your ideas.

Learn & Adapt

Learn what's new in web development and the React JS language. Hence, keep yourself informed by going to conferences, reading blogs, and posting on internet forums.

React JS Interview Questions You Can Expect to Hear Often

Here are some of the most often-asked questions at interviews for React JS:

Learn React JS and why it's useful.

Describe JSX and explain how it operates.

What exactly are React JS components?

What is React JS's "virtual DOM"?

Where do state and props differ in React JS?

How does the React JS component lifetime work?

Why does React JS employ Redux, and what is it?

Does React JS process events from the user?

In React JS, what is the distinction between a class component and a functional component?

In React JS, what is the distinction between a controlled component and an uncontrolled component?

Keep in mind that these are just a sampling of the wide variety of possible questions answered in a React JS interview. Before an interview, it's a good idea to review the fundamentals of React JS and get some practice coding and debugging.

How Internships Help You Unlock the Potential of React JS

Why Internships in React JS Matter Here are several reasons broken down into points below:

 Gain Real-World Experience

Internships in React JS are a great way to get hands-on training in a professional context.

You will get experience by contributing to real-world projects and gaining insight from more seasoned developers.

 Learning with Professionals 

Interning with a company that uses React JS will allow you to learn from professionals who have worked on large-scale online projects.

This may be quite helpful for keeping up with the current web development trends and learning about the best practices, tips, and techniques in the industry.

 Construct a Portfolio

Completing a React JS internship will provide you with valuable experience and projects to add to your portfolio.

Experience working on projects that showcase your expertise is highly valued by employers.

 Join Forces with Knowledgeable People

An internship in React JS can also be a great way to meet and network with industry leaders.

Likewise, opportunities for employment or connections with influential people in your field may arise as a result.

 Hone Your problem-solving Abilities

Interning with React JS will give you hands-on experience in a professional setting, allowing you to hone your problem-solving skills while contributing to meaningful projects.

You can hone your problem-solving abilities, which are crucial in the web development industry.

 Get familiar with Cutting-Edge Tech and Adapt to it

Interning in React JS may provide you with the opportunity to learn about and experiment with a variety of web development-related technologies and tools.

Thus, expanding your knowledge in this way can make you a more well-rounded programmer.

 Set Yourself to Apply for the Job

A React JS internship is a great way to get your foot in the door at a company and boost your chances of being employed after graduation.

Thus, it's a great way to meet other people in your field, which can lead to potential work prospects.

 Learn Agile Development Strategies

Many organizations employ Agile development strategies for creating React JS-based web applications.

Thus, an internship with a company that uses React JS can be a great way to gain experience with Agile development and see how it's put into practice.

 Soft Skills Knowledge Improvement

Interning in React JS can aid in the development of soft skills like communication, teamwork, and time management in addition to technical expertise.

In web development, where teamwork and clear communication are paramount, these abilities are very useful.

 Learn Where React JS Fits in the Big Picture

React JS is commonly used in tandem with other technologies like Node.js and MongoDB.

An internship with a company that uses React JS can give you hands-on experience with the framework while also exposing you to other web development tools.

 Experience a Wider Range of Businesses

React JS is used to create web applications in many businesses.

An internship in React JS can be a great way to get experience in a variety of fields, from banking and healthcare to e-commerce.

Mastering the Art of debugging is a must for any aspiring programmer

Any prospective coder would do well to learn the skill of debugging.

Likewise, an internship with a company that uses React JS can be a great way to gain experience with code debugging.

 Exploring UX

You should be familiar with UX design principles because React JS is frequently used to create such user-friendly interfaces.

Likewise, interning with a company that uses React JS can teach you about user experience design and how to apply it to your projects.

Lastly, React JS internship can be a fantastic stepping stone toward a career in web development. Don't wait. Enter this program through Spectrics Solutions.

Also Read :- How Can You Get IT Internships in Ahmedabad?

[startherefm]

Quick note: I recommend listening to this episode at 1.25 – 1.5 speed! It’s a long episode, so it’s a great time to experiment with increasing the speed to get more listening done!

We cover Questions on Javascript, Freelancing, How to Learn, Job Interviews, How to Handle Ageism in Tech, & everything else!

Topics covered: – The State of React in 2017 – The Best JS Frameworks to Learn for 2017 – How to split backend and frontend for complex apps – The FASTEST Way to Learn JavaScript – How to get your first freelance client – step by step – How to charge and structure freelance client work – How to deliver work to a client – How to handle ageism and other potentially destructive negative emotions related to your career – How to be adaptable in the face of challenge – How to “manage up the chain of command”

Supplementary reference materials: – https://github.com/acdlite/react-fiber-architecture – https://github.com/facebook/react – https://medium.com/javascript-scene/top-javascript-frameworks-topics-to-learn-in-2017-700a397b711#.a0crjpyq8 – https://vuejs.org/ – https://www.meteor.com/ – https://www.wikiwand.com/en/Loss_leader – http://okdork.com/2014/07/22/actions-techniques-to-go-from-0-to-your-first-1k-with-freelancing/ – http://javascriptweekly.com/ – http://rubyweekly.com/ – My Web Dev Sample Proposal – http://blog.careerfoundry.com/career-change/pricing-freelancer/ – http://www.creativeboom.com/tips/tips-on-how-much-to-charge-for-freelance-work/

Email me for more info on our web development coaching programs! miller.dain@gmail.com

Follow me on twitter for motivation and to be a part of a community of people who are focused on improvement: twitter.com/dainmiller

[pankaj-sharmaa]

React JS allows developers to build engaging user experiences which results in contributing to the growth of startups and growing businesses and it plays a vital role in shaping the digital landscape. If you want to start a career as React JS Developer then you need to clear the job interview or you can join Best React JS Courses for this.

[chaudharyglasspack23]

Do the main topics in react JS

Do the main topics in react JS

Are you guys React fans or what? I've been using it for a while, but I'll tell you how quickly your knowledge grows with this course. And that's even if you're experienced in React.

I have been working with reactjs for the past couple of months and this is by far the best resource I could find, especially to learn how to create reusable components.

React is a JavaScript library for building user interfaces. It's most commonly used with the web but you can use React in basically any project (like native mobile apps).

I've been using react for about a year now. I've created a website that gets tons of traffic, and it's still running smoothly (http://blog-dash.com). I've seen React used in production applications, and it has been working very well. So far, I haven't run into any problems with React. It's an easy-to-use library that makes your code simple to read, understand, and maintain.

The whole React component lifecycle is the process of a component entering and leaving the virtual DOM. It’s an important concept to grasp because React components are so flexible and reusable.

Read More: https://nearlearn.com/blog/top-react-interview-questions-you-must-prepare-in-2022/

The React team has done a fabulous job of explaining the React component lifecycle. I’ll give you the cliff notes because it will save us both some time. The most important thing to remember is that we can only use the componentDidMount and componentDidUpdate methods AFTER we have rendered the component with our return statement in the render method.

The React documentation on the life-cycle methods is fairly sparse. This article attempts to break down and explain each stage in the lifecycle and offers suggestions on when to use these methods.

The React component lifecycle is the order in which methods get called when a component is created, updated, and removed.

The component life cycle is the process that React uses to render and re-render components.

This is an excellent article. I'm just getting started with React and it's really helpful to see this information all in one place.

Animated transitions have become popular. They are a great way to add some extra flair to your app. There are many libraries that help make this easy. React-Motion is one of those libraries. It uses the native Animated library and is very similar in its API.

One of the best parts about React is that we get to use a virtual DOM. It allows us to render our components over and over again without affecting the DOM.

In this article, we are going to look at the build-up of our React components and how to make them more dynamic. We'll start by looking at one of the most basic React components, a Hello World component.

As React applications grow, the amount of code that we need to write also grows. In this post, I will introduce you to a few different methods for writing less code in your React components.

The Component API gives us the ability to compose complex user interfaces from reusable components. We can use the lifecycle methods in our components to perform some useful tasks.

The more specific your CSS is, the easier it is to maintain. It helps keep your stylesheets cleaner by being more specific and reduces repetition by grouping related styles. It also helps with specificity issues when dealing with responsive design.

[dvijinfotechwriter]

How to Select and Hire React Js Developers for Your Company And React Js Developer Skills?

What qualities should a good React Js Developer possess? And many other similar types of questions are common in the HR recruiting process for React JS developers. Let's go over these concerns in a step-by-step hiring process for a Great ReactJS Developer. And their skills for React js Developer Job Profile.

Researching for the Candidates

Finding the right candidates for React Js developer is one of the most difficult aspects of recruiting. Best strategies should be used by recruiters and HR professionals to find high-quality React js developers. Recruiting and hiring solutions have to emerge as a result of the changes and advancements in HR technologies. There are many ways that will help to get the candidate.

Bulletins and newspapers

Online job boards

Google Lookups

Website for social media

Website for Freelancers

Screening the candidates

We should sort through the CVs of candidates to find those with the most relevant skills, experience, and qualifications. The procedure should be followed meticulously to ensure that no relevant CVs are overlooked. This can be done both manually and automatically using the software.

A candidate with prior employment and good background experience should be preferred. Some recruiters believe that speaking with references provided by candidates is ineffective because candidates are more likely to choose individuals who have a favorable opinion; however, it is worthwhile to spend the time.

Shortlisting Candidates

The process makes narrowing down your pool of applicants less daunting. It also establishes standards for you and your talent acquisition team to consider when determining who the best candidates to speak with are.

There are a few advantages to practicing recruitment shortlisting. Shortlisting enables recruiting teams to focus their efforts on the most qualified candidates. Creating shortlisting criteria allows recruiters to spend less time sifting through unqualified applicants and more time on qualified candidates.

Identifying Technical Skills

The most important step in hiring React Js Developer is the verification of technical skills. This stage can be broken down into several sections, such as a technical interview and a test. A technical test, such as a scenario-based or case-based test, is very useful in evaluating React Js candidates.

Conducting a Personal Interview

We have many job requirements basis on that we should determine applicant skills experience and personality. It also assists the employer in determining whether an applicant is likely to fit into the corporate culture. Furthermore, preparing for an interview can help clarify the responsibilities of a position.

Job Offer

Job offer letter should include job title, compensation, benefits, and expected start date should all be included in offer letters. The start date is determined by the candidate's availability, but all other factors can be agreed upon ahead of time. This way, we will be able to send the offer as soon as possible to candidates who have moved on to another opportunity.

Make Contact

Once the candidate has accepted the job offer. The final contract, including additional rules and regulations of the company and other governmental authorities, is included in the offer for the candidate to sign.

Onboarding

The onboarding process should not be overlooked and undervalued. An effective onboarding process, as a formal introduction, can either put new employees on the path to success in your company or steer them in the opposite direction.

What Skills Should a Candidate Have in Order to Be Considered for a React JS Job Profile?

Telltale Signs to Ensure you're Hiring the right ReactJS candidate

Candidates must be familiar with basic web development languages like HTML, CSS, JavaScript, and ReactJS platforms like ReactJS, jQuery, Immutable, Redux, and others.

Expertise in all aspects of the ReactJS library, including the DOM, React elements, JSX, ES6, data binding, and so on.

Extensive knowledge of various tools such as Babel, webpack, npm, typescript, and GitHub

Soft abilities

Excellent comprehension and listening abilities

Thinking that is creative and solution-oriented

Excellent interpersonal and written communication abilities

Commitment, sincerity, time management, and ability to work as part of a team

Qualifications

Significant Experience with ReactJS and other JavaScript environments

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Certification allows for specialization in the ReactJS platform.

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[quizackofficial]

React.js Skills Assessment Online Test

It is a front-end, open source JavaScript library released for creating user interface components. This library allows developers to build optimistically performing web applications without reloading all the data for a particular web page. Furthermore, React.js allows you to handle the display layer of web and mobile applications.

Quizack React.js tutorial will assess skills based on ongoing trends

Quizack React.js Your skills assessment will be really effective if you are given the latest and authentic information and this is not possible if you are consulting random online resources. It will only be possible if you have subject matter experts with years of practical knowledge. So we follow this approach and have the most relevant industry experts.

Your skills and abilities will be assessed and assessed through the latest topics, 100% verified answers, typical scenarios, and interactive online sessions. You can quickly prepare in minutes for upcoming online assessments, IT exams, freelance skills tests, and job interviews.

Experts have designed the Quizack React JS Skill Test to cover topics

Event handling

Rendering functions

React rules and facts

React multiple choice quiz

Mounting method

Component optimization

React JS Coding Test Questions

Quickly diagnose scenarios through React JS interactive online practice

For the sake of your best online practice, we have made the React.js Q&A practice session available. This online exercise has no limitations. You can browse the questions of your choice and see their answers on the spot. To further encourage you, we have presented questions in the same format as in the actual exams. Consequently, our online practice will provide you with an understanding of how to tackle scenarios in real time and what the possible solutions would be.

React.js Online Test is an evaluation tool. Yes, you can also call it a virtual session because it has been designed to pick randomly selected questions one by one. Here, you will be asked to submit responses within the set time limit. At the end, you will see a list of correct answers for cross-checking purposes.

Who can join us?

You want to be a React.js consultant

Looking for the React.js interview questions and answers

Aspiring to become a React.js developer

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[yes-justice-seeking]

Doesn’t the #CCP plot things for the US Presidential Election?

On June 8, 2020, ZhuWanli, aka #朱万利, dropped a bomb in her daily YouTube video “Guo Wengui’s private jet landed 5 times in non-civil/non-commercial airport in NeiMenggu/内蒙古, China. Who were the passengers of each flight? More important, what have been carried back to the America? I said in the previous video that when the event is exposed, when the American presidential election ended, when President Trump get re-elected, you should be prepared to be stunned. The show will be ended, period. Some of the event is SECRET. I shouldn’t be the person to tell the secret. It shall be reported by the American media... All Steve Bannon and Guo Wengui have done will be exposed to the public.”

https://twitter.com/detecti28108231/status/1271464416769454081

https://www.youtube.com/watch?v=NlElw4irtNs （from 52:33） 

After I questioned how could #ZhuWanli/#朱万利 know the SECRET, @jenni82822567 jumped out to defend for #ZhuWanli/#朱万利.

https://twitter.com/detecti28108231/status/1271488214205947904

On June 17, the tweet account @jenni82822567 who seems to have a close tie with #ZhuWanli/#朱万利 tweeted:”I found a document in an envelop. it’s about Bannon and other passengers�� flights in GuoWengui’s private jet from September to December, 2018... I actually found a nuclear bomb!” 

In her tweet, she gave a picture of  Jeffrey Epstein!

https://twitter.com/jenni82822567/status/1273458857893904384

On June 28, 2020, @jenni82822567 tweeted that “Jeffrey Epstein is Bannon’s good friend”.

https://twitter.com/jenni82822567/status/1277320445734289411

Meanwhile, she called Steve Bannon and GuoWengui “criminal gang” and said “if the America starts to probe into it, it will be a bombshell case. Once the Pandora box is opened, it will influence the US presidential election. Hopefully, Bannon-Guo criminal gang will be brought to justice.” 

It matches perfectly the #CCP’s interests, isn’t it?

https://twitter.com/jenni82822567/status/1277335935768821762

https://twitter.com/Tinasun20/status/1277101954888597504

https://twitter.com/jenni82822567/status/1274119973905010693

On July 2, 2020, the headline of the American media is Jeffrey Epstein’s associate Ghislaine Maxwell has been arrested by the FBI.

https://globalnews.ca/news/7131017/jeffrey-epstein-ghislaine-maxwell-arrested/

Speaking of “finding a document lost by someone”, it appears to be a trick for the #CCP to release some SECRET in purpose. Another example: The tweet below says that he found a paper saying @WSJ will publish a report about #GuoWengui and his buddy Steve Bannon. It also says that’s why they have been staying on a yacht for the last week. 

https://twitter.com/Thucydidestrap1/status/1280782203023052800

@wsj​ then published the exact story on the exact day:

https://twitter.com/ScottMStedman/status/1280999334675267584

How many secrets does  #ZhuWanli/#朱万利 know?

On June 26, as per  @jenni82822567,  #ZhuWanli/#朱万利 said there are many SECRETS about GuoWengui that she can’t tell; Zhu announced that if #WSJ does not publish the story, it must be because of the #FBI’s request for classified information in connection with the National security and celebrities. She added that “Fraud Guo’s big show will be ended soon”.

Again,  how does #ZhuWanli/#朱万利 know so many secrets?

https://twitter.com/jenni82822567/status/1276659643243249666

On the same day,  #ZhuWanli/#朱万利 said in her YouTube video that she wouldn’t suggest #ZhuangLiehong/#庄烈宏 to file a counter-claim against #GuoWengui for the SECRET reason that she can’t tell, except if ZhuangLiehong is her close-friend. It implies again that she knows SECRET and she may trade the secret in certain circumstance. That reminds me of the policy of the CCP’s intelligence business”以商养情，商情两旺” which means to develop commercial business with in the intelligence business system and use the commercial business to support the intelligence business for mutual prosperity. No wondering why the CCP has more and more spy defectors: they’ve been trained to trade SECRET for any possible personal benefit.

https://twitter.com/detecti28108231/status/1279827487250436096

https://baike.baidu.com/item/%E4%BB%A5%E5%95%86%E5%85%BB%E6%83%85

Before @WSJ who “firstly” published #FBI’s investigation on GuoWengui and Steve Bannon, #ZhuWanli/#朱万利 had already announced it in advance on July 2, 2020 with many details such as the investigation involves National Security matter and fraud matter. She even told people that the person who had been interviewed by the FBI called/reported to her immediately after stepping out the FBI office. That being said, #ZhuWanli/#朱万利 has some insiders to leak #FBI’s investigation to her. More over, some so-called “victims” co-operate closely with her. Bear in mind that GuoWengui has been the CCP’s No. 1 target ever since his Whistle-Blowing Movement/爆料革命. Even #WSJ, the Defendant of GuoWengui’s lawsuit admitted it:

http://archive.is/Z54P6#selection-2415.6-2415.124

Isn’t it possible that the CCP has someones infiltrated into Guo’s team and then turned against him as “victim”? 

https://twitter.com/Tinasun20/status/1278882476077834241

On July 11, 2020, following Chinese virologist Dr. Li-Meng Yan’s accusation of Beijing’s handling of COVID19, the above-mentioned warriors of the anti-#GuoWengui group criticized Dr. Yan, co-incident?  

https://twitter.com/Tinasun20/status/1281956341020536832

How does #ZhuWanli/#朱万利 get paid?

I don’t know, but as a YouTuber, she receives a huge amount of money likely from an organized anti-GuoWengui group.

https://twitter.com/Tinasun20/status/1281353626146025473

How Important #ZhuWanli/#朱万利 is to the CCP?

I received threats when I was mining web information about ZhouLibo/周立波’s case in which I may have reached the CCP’s oversea assets and their trustees/#白手套. Warning message appears again for the contents here. I’ve been asked to delete the video and someone made a “typo” in purpose saying “SHE is going to die for her mistake”.

https://www.youtube.com/watch?v=_QSo78LBSiM

https://www.youtube.com/watch?v=_QSo78LBSiM

http://archive.is/Z54P6

Speaking of the possibility of the CCP's infiltration into Guo’s team and then turned against him at some point in order to give an overwhelming blow from inside and outside to their No.1 enemy, GuoWengui, after #ZhuWanli/#朱万利suspiciously announced on June 26 that the FBI searched GuoWengui’s “Himalayas embassy/喜马拉雅大使馆”  which no mainstream media confirmed  so far, if I am not mistaken.

https://twitter.com/nvwa30/status/1276679668939100163

In the following days, on June 27 and 28, two members of Guo’s team, namely #豆豆, aka #豆小豆, and #JS openly went against him and claimed as victim of the GTV private offering. They both went to the same anti-GuoWengui social media platform. 

https://twitter.com/IEqtc666hbD9BgT/status/1277029571540291586

https://twitter.com/keepmoving223/status/1277110246637555715

Unlike others who fled from GuoWengui’s team, #豆豆, aka #豆小豆, joined the team for a very short time calculating from January, 2020. Before her joining, she prepared herself with a rush catch-up of the Whistle-Blowing Movement/爆料革命. Five months after, she turned herself against GuoWengui and his team, claiming that she was so politically naive to believe GuoWengui’s political propaganda that all US dollars/euro-dollars will fall rapidly and invest in #GTV is the only way to protect her assets. Although the public image she has been creating so far is a “too young too simple” girl, her age is over 30, probably 35 years old and it sounds totally different when she teaches people how to report to the FBI with a very thoughtful advice about what translation tool will be the best for “victims” in China. 

It came to my attention that when someone advised her to re-consider the investment, she refused it. 

Her saying that “it’s stupid for the oversea Chinese to have a sense of duty to change the country/墙外的人有一种救世的责任感，真是250.” does not fit the image of a politically silly girl, rather a CCP proxy.

https://www.youtube.com/watch?v=Q2PHwbtFnbE

As for the pretext of lack of money for her mother’s medical treatment, she accidentally released that the reason she invested in GTV is for tax evasion. Her tweets suggest that her life-style is more close to the CCP’s establishment.

What's her true face? A young silly and poor victim of a scam as she pretended to be or a finely seasoned one of the CCP establishment?

Click to enlarge the image

In addition, according to  #豆豆’s narrative, the first time she had a second thought about the investment was June 4, 2020 and she decided to withdraw the money she’d invested in #GTV. Contrary to an ordinary person’s reacting, she moved forward on June 6 to make a donation of $2,020.64 to the Rule of Law foundation which is also maintained by Steve Bannon and GuoWengui’s team. She then submitted on June 7 a withdraw request to GuoWengui’s team to recall her investment to GTV share purchase. After that, contrary to her withdraw move, she filed a registration request for a higher level in GuoWengui’s team, trying to involve deeper? Unbelievable! 

Evidence collected in the video below:

https://www.youtube.com/watch?v=dyIBut7-vtE

All of the above-mentioned facts lead to the following questions:

-What’s her motive behind the repeated back/forward moves?

-Is it for information/evidence collecting purpose?

As for the GTV private offering, I actually raised an alarm bell on May 9, 10 and 11:

从GTV私募串烧，看 郭文贵 v 中共 pk

https://www.youtube.com/watch?v=c9I1oYKCPGE

https://www.youtube.com/watch?v=VRCPRo8iXSk

https://www.youtube.com/watch?v=Fh_aSmNaVBY

Yet, evidence shows that the warning message has been ignored or suppressed intentionally in order to have more people fall into the trap. With the series of SECRET releasing, the one by one fraud complaints against the GTV private offering and the massive media coverage targeting unanimously the CCP’s No. 1 enemy: GuoWengui, it’s hard to believe it just happened co-incidentally.

Further more, it is interesting to note that 豆豆 openly called people to tweet ON DAILY BASIS to @DanScavivo, White House’s officer. She said it was an advise from an insider. Who’s the insider? Wouldn’t it constitute a twitter attack against the White House? Who will benefit from such social media attack? The answer is obvious.

https://twitter.com/detecti28108231/status/1280942129183932418

https://twitter.com/keepmoving223/status/1280204413504798721

Many people believe that “the enemy of my enemy is my friend” and GuoWengui’s personality can easily turn people to his enemies. Don’t you believe that the the CCP knows it very well and may have been exploiting it for its interests? 

For those who tend to label me, I have to make myself clear again: I am NOT pro-GuoWengui, nor pro-CCP, all I care is the Human Rights and the truth! 

https://twitter.com/detecti28108231/status/1268571734069911552

中文视频：

[t-baba]

A lot of questions for JavaScript developers

#492 — June 12, 2020

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JavaScript Weekly

153 JavaScript Questions (With Their Answers Explained) — Want to test your JavaScript knowledge? Whether for fun or a job interview, this is an interesting set of questions, complete with explanations of the answers. We first linked to this a year ago when it only had about 40 questions, so it’s grown a lot!

Lydia Hallie

An ECMAScript Proposal: Logical Assignment Operators — Dr. Axel covers another proposal in the pipeline for the language that would let us do things like a ||= b or a &&= b as you might in, say, Ruby or Perl.

Dr. Axel Rauschmayer

New Course: React Native — Leverage your JavaScript and React skills for mobile iOS and Android platforms using React Native – ship your very own native mobile applications.

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Node Weekly: Our Sister Newsletter for Node Developers — Earlier this week I was speaking with a long time JavaScript Weekly subscriber who hadn’t heard of Node Weekly, our Node-focused weekly newsletter, so I thought I should invite you all to check out the latest issue as we cover a lot of Node things there that we don’t include in JSW :-) Be sure to check out the “7 Interesting Node Modules and Tools” section at the bottom!

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⚡️ Quick bytes:

JSGrids is a handy compilation of the best spreadsheet and data grid libraries so you can compare and pick the right one for you.

VS Code May 2020 has been released with a preview of editor setting syncing between multiple machines, CommonJS auto imports, preserved newlines during JS/TS refactorings, and more.

Excited for Vue 3? There's now an 'awesome' list for Vue 3 resources, links, videos, etc.

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📚 Tutorials, Opinions and Stories

An Old School Doom Clone (in 13KB of JavaScript) — I have no idea how we missed this last year, but wow, what a neat piece of work. You can even grab it and play with the code yourself.

Nicholas Carlini

Type Assertions in TypeScript — A way to temporarily override a type, a little like lightweight casting.

Dr. Axel Rauschmayer

How to Deploy a Gridsome App on Azure Static Web Apps — Brings together the Gridsome Vue.js site generator with Azure’s new static app deployment service.

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Bitmovin Magazine 5th Edition: Shaping the Future of Video — Get the latest overview of our products, recent feature releases, current video trends, and customer case studies.

Bitmovin Inc. sponsor

Using Higher-Order Components in React — Learn about higher-order components, the syntax of higher-order components, as well as use cases for them.

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How to Compare Objects in JavaScript — Compares a few different levels of what ‘equality’ actually is when it comes to JS objects.

Dmitri Pavlutin

Svelte, Why So Much Hype? — A closer look at the component-based library.

Anthony Le Goas

Improving the Rendering Performance of a Large List View in AngularJS 1.2.22 — You’re probably not doing this, but this is a pretty neat look at approaching performance issues in legacy apps.

Ben Nadel

🔧 Code & Tools

njt (npm jump to): A Quick Navigation Tool for npm Packages — njt is a tool you can either use locally (npm install njt first) or on the Web site and it acts as a way to quickly reach a package’s issues, homepage, pull request, and numerous other things. Clever idea.

Alexander Kachkaev

Math.js 7.0: An Extensive Math Library for Node.js and Browser — Work with complex numbers, fractions, units, matrices, symbolic computation, etc.

Jos de Jong

Stream Chat API & JavaScript SDK for Custom Chat Apps — Build real-time chat in less time. Rapidly ship in-app messaging with our highly reliable chat infrastructure.

Stream sponsor

Quotebacks: Embed Quotes Without Losing Context — This is a small library that can embed a quote in an attractive format within the source context. Can also be used as a Chrome extension that saves to local storage.

Tom Critchlow and Toby Shorin

Johnny Five 2.0: A JavaScript Robotics and IoT Programming Framework — If you’d wondered why you haven’t seen much about Johnny Five lately, don’t fear, because… Five is Alive! v2.0 is primarily an internal rewrite release rather than boasting lots of new features, though.

Rick Waldron

Karma 5: A Multiple Real Browser Test Runner for JavaScript — A popular way to test your code in multiple, real browsers at once. GitHub repo.

Karma

React Date Picker 3.0: A Simple and Reusable Date-Picker Component — A mature option that continues to get frequent updates. Demo here.

HackerOne

ModJS: A JavaScript Module for KeyDB and Redis — This isn’t for using Redis (or the KeyDB fork) from JavaScript but for taking JavaScript into the popular data structure server in case you prefer JavaScript to Lua for scripting it.

John Sully

Getting Started With OpenTelemetry In Node.js

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Lightweight Charts 3.0: Canvas-Powered Financial Charts

TradingView, Inc.

tsParticles v1.15.0: A TypeScript Library for Particle Effects — Lots of neat demos in this announcement post. It’s basically Particles.js, but ported to TypeScript. GitHub repo.

Matteo Bruni

Josh.js: A Library to Animate Content on Page Scroll — This effect feels a little overdone nowadays, but this library is small, efficient, and it feels performant to me too.

Al Mamun

SVGuitar: Create SVG-Based Guitar Chord Charts — Very flexible and customizable and you can have a hand-drawn effect as well.

Raphael Voellmy

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[siva3155]

300+ TOP React Native Interview Questions and Answers

React Native Interview Questions for freshers experienced :-

1. What is React Native? React native is an open-source JavaScript framework designed by Facebook for native mobile applications development. It is based on a JavaScript library-React. React Native saves your development time as it enables you to build real and native mobile apps within a single language – JavaScript for both Android and iOS platforms, such that code once, run that on any platform, and the React Native App is ready for use with native look and feel. 2. Why use React Native? There is the following list of React Native features behind its use: Easy to use. Open-source framework Cross-platform compatibility Code Sharing Use a common language – JavaScript for cross-platform development. Faster Development Saves Time and efforts Gives Native look and feel 3. What are the advantages of React Native? React Native is based on “Learn Once Write Everywhere” approach to equip developers with a tool that only needs to be learned once, just in a single language and then can be reused on both iOS and Android mobile platform. React Native offers cross-platform development and a real experience to developers allowing them to build only one app with effectively 70% code sharing between different platforms. React Native helps in faster development. Building one app instead of two using a common language gives speedier app deployment, delivery, and quicker time-to-market. React Native exists with essential components for ending of native apps as the app development ends with native look and feel. React Native has a large community of developers for its security. The developers are always ready to fix bugs and issues that occur at any instant. They improve the performance of React Native from time to time with the best practices possible. React Native supports Live and Hot Reloading. Both are different features. Live Reloading is a tool that helps in compiling and reading the modified files. Hot Reloading is based on HMR (Hot Module Replacement) and helps to display the updated UI content. 4. List the essential components of React Native. These are the following essential components of React Native: View is the basic built-in component used to build UI. Text component displays text in the app. Image component displays images in the app. TextInput is used to input text into the app via the keypad. ScrollView is a scrolling container used to host multiple views. 5. What are the cons of React Native? React Native is still a new development platform as compared to iOS and Android platforms. It is still immature, i.e., in an improvement stage and impacting negatively on apps. Sometimes, React Native built-in apps face performance problem if there is a requirement of advanced functionality. In that case, they don’t perform well as compared to native apps. React Native has a steep learning curve for an average learner as it is not more comfortable in comparison to other cross-platform apps. It is because of existing JSX (JavaScript Syntax extension) in which HTML and JavaScript get combined and make learning challenging for average ones. React Native is based on JavaScript library which is fragile and creates a gap in the security robustness. As an expert’s point of view, React Native is not secure and robust for building highly confidential data apps like Banking and Financial apps. 6. How many threads run in React Native? There are two threads run in React Native: JavaScript thread Main UI thread 7. What are props in React Native? props pronounced as the properties of React Native Components. props are the immutable parameters passed in Presentational Component to provide data. 8. What are React Native Apps? React Native Apps are not web apps; they are the real and native mobile applications built-in a single language with the native components to run on mobile devices. 9. List the users of React Native? There are thousands of React Native built-in apps. Here is the list of those apps: Facebook Facebook Ads Manager Instagram F8 Airbnb Skype Tesla Bloomberg Gyroscope Myntra UberEats 10. For what purpose XHR module used in React Native? XHR module implements XMLHttpRequest to post data on the server.

React Native Interview Questions 11. Can we use Native code alongside React Native? Yes, we can use a native code alongside React Native for task completion, and several limitations can also overcome in previous versions like Titanium. 12. Are React Native built-in mobile apps like other Hybrid Apps which are slower in actual than Native ones? React Native designed as a highly-optimized performance-based framework that builds real mobile apps with native components. Facebook is the best-suited example of high performance based app built-in React Native. 13. What is the difference between React and React Native? React is a JavaScript library while React native is a framework based on React. js used for building UI and web applications while React Native is used for creating cross-platform native mobile apps. Both uses synonymous tags such as

are the tags in React.js and are the tags in React native. js uses DOM for path rendering of HTML tags while React Native uses AppRegistry for app registration. 14. What is the difference between React Native and Native Script? React Native uses only a single core development language- JavaScript while Native Script can use any of these languages- Angular, Vuejs, TypeScript, and JavaScript. React Native has faster development speed than Native Script. React Native exists with reusable components that developed at once can be used at different mobile platforms and accelerates mobile app development while Native Script exists with a less number of plugins among which some pass improper verification. React Native performs high as compared to Native Script. React Native is React based and uses virtual Dom for faster UI updation while Native Script uses slower Angulas, Vuejs, and TypeScript. Native Script exists with a box of various themes that shorten the gap between the different platform UIs while React Native doesn’t live with predefined themes; you get default look and feel by the devices. 15. Can we combine native codes of Android and iOS in React Native? Yes, we can do this as React Native fluently combines the components of both iOS and Android written in Swift/ Objective-C or Java. 16. What is the point of StyleSheet.create() in react native? In React Native, StyleSheet.create() send the style only once through the bridge to avoid passing new style object and ensures that values are immutable and opaque. 17. Why React Native has very clear animations? The animated API of React Native was designed as serializable so that users can send animations to native without going through the bridge on every frame. Once the animation starts, a JS thread can be blocked, and the animations will still run fluently. As the code converted into native views before rendering, the animations in React native will run smoothly, and the users get bright animations. 18. Differentiate between the React component and the React element. React component is a class or function that accepts input and returns a React element while React element displays the look of React Component Instance to be created. 19. Why React Native use Redux? Redux is a standalone state management library that React Native use to simplify data flow within an app. 20. Which node_modules will run in React Native? How to test for this? In React Native, node_modules as any pure JavaScript library that does not rely on Node.js runtime modules, and does not rely on web-specific concepts like window.location.pathname will run fine. But be conscious as there exists no way to test for this with Babel- it doesn’t scan these libraries for offending dependencies. A module that uses window.location.pathname may fail at runtime in a different unexpected place. 21. What is Virtual DOM and how it works in React Native? Virtual Dom is an in-memory tree representation of the real DOM with lightweight elements. It provides a declarative way of DOM representation for an app and allows to update UI whenever the state changes. Working Virtual DOM lists elements and their attributes and content. It renders the entire UI whenever any underlying data changes in React Native. Due to which React differentiates it with the previous DOM and a real DOM gets updated. 22. What is InteractionManager and what is its importance? InteractionManager is a native module in React native that defers the execution of a function until an “interaction” finished. Importance React Native has JavaScript UI thread as the only thread for making UI updates that can be overloaded and drop frames. In that case, InteractionManager helps by ensuring that the function is only executed after the animations occurred. 23. What is the point of the relationship between React Native and React? React is a JavaScript library. React Native is a framework based on React that use JavaScript for building mobile applications. It uses React to construct its application UI and to define application business logic. React updates a real DOM by tree diffing and allows React Native to work. 24. What are the similarities between React Native and React? React.js and React Native share same lifecycle methods like componentDidMount same state and prop variables same component architecture similar management libraries like Redux 25. Describe HOC. HOC (High Order Components) in React is the functional programming methodology for reusing component logic. takes a component as an argument and returns a new component It is a pattern evolved from React’s compositional nature to decompose the logic into simpler and smaller reusable functions. 26. Define Native apps. Native app is a software program for a specific mobile device that is developed on a particular platform in a specific programming language like Objective-C/Swift for iOS and Java for Android. It can use device-specific hardware and software as built on a particular device and its OS. It uses the latest technology such as GPS and provides optimized performance. 27. What are Hybrid Apps? Hybrid applications are the web applications developed through HTML, CSS, JavaScript web standards and wrapped in a native container using a mobile WebView object. These apps are easier to maintain. 28. What are refs in React? When to use Refs? Refs are escape hatch that provides a direct way to access DOM nodes or React elements created in the render method. Refs get in use when To manage focus, text selection, or media playback To trigger imperative animations To integrate with third-party DOM libraries 29. What does a react native packager do? A react native packager does a few things: It combines all JavaScript code into a single file It translates any JavaScript code that your device don’t understand (e.g., JSX or some of the newer JS syntax) It converts assets like PNG files into objects that can be displayed by an Image 30. What is NPM in React Native? npm installs the command line interface in React Native. npm install -g react-native-cli 31. What are “props” and “state”? “Props” and “state” are both plain JavaScript objects used to control data inside the components. props short for “properties.” Immutable parameters -> Unchangeable inside the component. Set by their parent and fixed for the whole lifetime of a component. Get passed to the Presentational component. state Mutable parameters -> Changeable inside the component. Get handled within the container component. Can’t be accessed and modified outside the component. 32. What is Style? The style prop is a plain JavaScript object use to making style of React Native application. There are two ways to style your element in React Native application. style property: adds styles inline. external Stylesheet: enables us to write concise code. 33. How To Handling Multiple Platforms? React Native smoothly handles multiple platforms. The large numbers of the React Native APIs are cross-platform so that one React Native component will work seamlessly on both iOS and Android. It provides the ways using which you can easily organize your code and separate it by platform: Platform module to detect the platform in which the app is running and platform-specific file extensions to load the relevant platform file. 34. When would you use a class component over a functional component? We use class component if our component has state or a lifecycle method(s). Otherwise, we use a Functional component. 35. How React Native handle different screen size? React Native offers many ways to handle different screen sizes: Flexbox Flexbox is designed to provide a consistent layout on different screen sizes. It offers three main properties: flexDirection justifyContent alignItems Pixel Ratio exists in the official documentation with the definition such that we can get access to the device pixel density by using PixelRatio class. We will get a higher resolution image if we are on a high pixel density device. An ethical principle is that multiply the size of the image we display by the pixel ratio. Dimensions easily handle different screen sizes and style the page precisely. It needs to write the code only once for working on any device. 36. Are all React components usable in React Native? Web React components use DOM elements to display (ex. div, h1, table, etc.), but React Native does not support these. We will need to find libraries/components made specifically for React Native. But today React is focusing on components that can be shared between the web version of React and React Native. This concept has been formalized since React v0.14. 37. What is the challenge with React Native? Working across separate Android and iOS codebases is challenging. 38. Does React Native use the same code base for Android and iOS? Yes, React Native uses the same code base for Android and IOS. React takes cares of the native components translations. For example A React Native ScrollView uses native ScrollView on Android and UiScrollView on iOS. 39. Thus React Native is a native Mobile App? Yes, React Native compiles a native mobile app using native app components. React Native builds a real mobile app that is indistinguishable from an app built using Objective-C or Java. 40. What is Gesture Responder System? The gesture responder system manages the lifecycle of gestures in the app. Users interact with mobile apps mainly through touch. They can use a combination of gestures, such as tapping on a button, zooming on a map, sliding on a widget or scrolling a list. The touch responder system is required to allow components to negotiate these touch interactions without any additional knowledge of their parent or child components. 41. How can React Native integrate more features on the existing app? React Native is great to start a new application from scratch. However, React Native works well to add new features to an existing native app. It needs some steps to add new React Native based features, screen, views, etc. The specific steps are different for different platform you’re targeting. Set up directory structure. Install JavaScript dependencies. Configuring permissions. Code integration. Test your integration. 42. What is the storage system in React Native? React Native uses AsyncStorage class to store data in key-value pair which is global to all app. AsyncStorage is a JavaScript code which is a simple, unencrypted, asynchronous and persistent. React Native also uses separate files for iOS and RocksBD or SQLite for Android. Using AsyncStorage class, you must have a data backup, and synchronization classes as data saved on the device is not permanent and not encrypted. 43. How React Native load data from server? React Native provides the Fetch API which deals networking needs. React Native uses componentDidMount lifecycle method to load the data from server. fetch('https://mywebsite.com/mydata.json') Other Networking libraries which interact with server are: XMLHttpRequest API WebSockets React Native Questions and Answers Pdf Download Read the full article

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Electric Eye: Front End Shopify Developer

Headquarters: Columbus, OH URL: https://electriceye.io

IMPORTANT: Looking for candidates that have Shopify experience. We will not consider candidates that don’t send the necessary documents listed below or answer the required application questions.*

Electric Eye is a boutique agency focused on helping brands grow their online sales. We are certified Shopify Experts who provide well-designed, data-driven solutions, allowing our clients to worry less about technology, and focus on running their business.

The agency was founded from our passion to help solve problems. Our process starts with site optimization through design and development, followed by marketing & automation efforts to accelerate growth. Clients appreciate our dedication, and the results we provide through tangible revenue.

Electric Eye is a small agency by choice. This allows their tight-knit team to work directly with key decision makers to quickly generate ROI for their clients.

Our four pillars define the way we work and the way we make decisions:

Honesty - We are up front with our clients and employees

Efficiency - We solve our client’s problems swiftly and accurately

Expertise - Our clients trust us to make the best decisions on their behalf

Accountability - We are accountable for our work and guarantee satisfaction

Description of the vacancy:

Electric Eye is looking for world class development for Shopify stores.

The vacancy is for developers who appreciate design and who are interested in delivering "pixel perfect" results. In addition to technical knowledge, they must have the habit and self-demanding attitude to create high quality products.

a) Necessary skills:

Advanced knowledge of the technologies used (HTML, CSS, JavaScript) and ability to propose alternative solutions and cost-benefit analysis based on them.

Solid understanding of the fundamentals of computing: object-oriented design, data structures, algorithm design and programming logic, problem solving and complexity analysis.

Understanding of the best development practices with the technologies used to achieve greater store performance.

Compression and correct execution of instructions, self-review of deliverables, time management, teamwork and communication skills.

Experience in the integration of HTML content with other third-party elements (for example: CMS platforms).

Knowledge of API Rest consumption.

Driver management of GIT versions.

b) Desired knowledge:

Management or basic knowledge of some type of JS Framework (Vue or React).

Development of micro-services to communicate with the Shopify platform.

Basic knowledge of task automation tools (Gulp, Webpack, etc.).

General information:

Address: Remote

Hours: Monday through Friday from 9am to 5pm

Net salary: $60,000

Quarterly productivity bonuses

Bi-weekly coaching sessions

Recruitment process: The recruitment process has a maximum duration of 10 days from the moment the candidate sends your application.

Analysis of candidate information: CV and Github or project portfolio

Introductory conference call (on Zoom)

Sample Work & Review

Conference Call interview with Managers

Conference Call interview with Founders

If interested, apply at https://ift.tt/37kN5ki and upload the following information:

CV

Github or project portfolio

IMPORTANT: We will not consider candidates that don’t upload the necessary documents listed above.*

Job Type: Full-time

Salary: $60,000.00 /year + performance based bonus

To apply: https://electriceye.io/pages/employment-application

from We Work Remotely: Remote jobs in design, programming, marketing and more https://ift.tt/2Qw5lks from Work From Home YouTuber Job Board Blog https://ift.tt/2QxB30O