#reactjs questions

[legendaryearthquakestranger]

ReactJS interview questions

ReactJS interview questions: Prepare for your ReactJS interview with these 25 comprehensive and original interview questions and answers covering React basics, components, state management, lifecycle methods, hooks, JSX, virtual DOM, and more. ReactJS Interview Questions and Answers ReactJS Interview Questions and Answers What is ReactJS? ReactJS is an open-source JavaScript library…

[divukanwar]

Hire Reactjs developers have the flexibility to build a web project for design and industry. They use their programming skills to create JavaScript for web or mobile environments. React JS developer is creating a single-page application. By creating a single-page application you will not have to refer again and again. If we talk about the application of React Js to Facebook, I also used React Js developers on Instagram.

We are a team of highly skilled and experienced people who dedicate their time to offer you quality service when hiring a ReactJS developer from us. With our expertise in the latest ReactJS tools, our developers excel in designing ground-breaking bespoke solutions for businesses. Our developers guarantee satisfactory customer service where they’re constantly available for your questions and remarks. We promise timely completion of all projects just to give surety that your project will not exceed its stated timeframe.

[learntechsolution]

Deploying a Node.js application to Heroku is a straightforward process. Heroku is a platform as a service (PaaS) that allows you to easily deploy, manage, and scale web applications. Here's a step-by-step guide to deploying a Node.js application to Heroku

[learn-techsolution]

Deploying a Node.js application to Heroku is a straightforward process. Heroku is a platform as a service (PaaS) that allows you to easily deploy, manage, and scale web applications. Here's a step-by-step guide to deploying a Node.js application to Heroku

[learntech-solution]

Deploying a Node.js application to Heroku is a straightforward process. Heroku is a platform as a service (PaaS) that allows you to easily deploy, manage, and scale web applications. Here's a step-by-step guide to deploying a Node.js application to Heroku

[learn-tech-solution]

Deploying a Node.js application to Heroku is a straightforward process. Heroku is a platform as a service (PaaS) that allows you to easily deploy, manage, and scale web applications. Here's a step-by-step guide to deploying a Node.js application to Heroku

[snickerduu]

how did you make your own website? & how long did it take you to make it? i am interested in web dev,,, do you have any tips or any helpful sites for beginners/ intermediate? (sorry for asking so many questions!)

hey no problem, asking is a great way to learn always!!

i started on my portfolio site i think around september 2022, forgot about it because of work, then went back to it and deployed it around march 2023! i learned a lot at work, so i just applied what i learned from working in web dev to my own personal site

regarding how to start, if you're a complete beginner, i'd suggest playing around with HTML/CSS first since it's kind of the basic building blocks for doing frontend stuff -- for the first few projects you could try copying simple sites like Google's home page :) there are little interactive tutorials you can find online too like flexbox froggy that can help teach diff concepts in a fun way!

after feeling comfortable with it, i'd suggest playing around with ReactJS when starting out with web dev; it's easy to get into because of its extensive documentation and its large community! there are step-by-step guides into setting it up and several tutorials (both video/article)

if you decide to get into actually deploying your stuff and connecting it to APIs, you can start looking into other frameworks like NextJS/GatsbyJS etc.

getting yourself into a web dev project, like maybe making a small notes/checklist web app or your own portfolio site is a fun way to experiment!! the hardest part is always finding the motivation to start them imo :) wishing u the best on ur web dev journey!!!!! 💗

[homeworkforlife]

30th May 2025 | Not a Technical Interview

Today was hilarious. I was messaged to my work text app to check if I could do a call that's just a 10 mins chat at 3PM. I was busy outside and mentioned if it could be done on Monday instead.

A conversation happened and I decided that I can do it today at 3PM. I was told it's just a 10 mins chat. Upon the call at 3PM, I shared details about myself. After that it became a technical interview where I was asked very reasonable questions about my knowledge on ReactJS but lots of it were memory based. I knew the answers and I could answer them, but due to not having touched ReactJS for awhile, I couldn't answer them as much as I could have had I revised it.

After the call ended I was told not to worry so much about the technical interview, which is nice haha because while a technical interview happened, it wasn't about that.

I appreciate him saying that and I don't know what they were assessing but it was a funny experience. I of course hope to get it so that I can become even better in my ReactJS. However, if it doesn't go accordingly, I wouldn't in anyway consider that a defeat or disadvantage.

There's also another reason to that that I want to highlight. My senior who very competently taught me ReactJS has moved to a different country. While she's not recognised by one key leader in our old team as being as capable as the other person, who is actually arrogant and seemed like the most skilled developer, she certainly is. Based on my experience with them, they are both quite closely technically skilled, but that other arrogant seeming person seemed to be perceived incorrectly as being the most skilled.

While she has ample experiences under her belt, she chose to work in a startup doing what she's good at. To me, this isn't a setback, but a step forward because it's an experience to learn how to build her own company and how running a startup is like.

With that mindset in me, if I'm honest, I kinda am excited to work in a startup. Not one that's just started or struggling, but one that's promising and well managed by competent leaders. I might move on to do a startup or some SMEs. I'm not sure if doing corporate actually allows me to become better at a faster pace, or even earn the salary that I deserve. It hasn't seemed that way to me and for lots of people who I have spoken to.

All I know is that lots of highly skilled software engineers either stay in corporate being paid well with their high positions and severe stress. Or the rest, who move on to start their own startups or companies. If I'm honest, owning a company and managing one, even if it were much smaller in scale or may earn less, sounds more like success to me than those who stayed in corporate. However, in no way do I mean that corporate is bad or always worse, I'm mostly referring to this in the context of middle-aged highly skilled software engineering workers. Working in corporate has lots of benefits as well, but for sure it's not significantly better an experience than running your own startup/business or company, where you actually own an asset and have more freedom over how you can do your work.

[saifawaisi3211]

Finding the Right Website Developer in Johannesburg: Why Hello Errors is the Smart Choice

In today’s fast-paced, mobile-first world, having a website is more than just a digital necessity—it’s your brand’s storefront, marketing tool, and credibility card all rolled into one. For businesses in Johannesburg looking to thrive online, partnering with an expert website developer in Johannesburg is a critical first step.

Johannesburg is a bustling hub of innovation, entrepreneurship, and digital evolution. From local startups and eCommerce brands to corporate firms and creatives, businesses across the city are tapping into the power of web development to grow their market reach. But the real question is—who can you trust to build a website that performs, engages, and converts?

That’s where Hello Errors, a global digital solutions company, comes into the picture.

The Johannesburg Digital Scene: Why Your Business Needs a Pro Website

Johannesburg has quickly evolved into South Africa’s tech powerhouse. With an influx of tech-savvy consumers, rising mobile usage, and growing digital competition, local businesses can no longer afford outdated or clunky websites.

Here’s why having a professionally built website matters more than ever:

First impressions count: In most cases, your website is the first interaction a customer has with your brand.

Mobile usage is exploding: Without a responsive design, you’re losing potential clients.

SEO = visibility: A well-coded and optimized website can significantly improve your search engine rankings.

Security and trust: Secure websites inspire trust and protect customer data.

Conversions matter: It’s not just about looking good—it’s about guiding users to take action.

Choosing a seasoned website developer in Johannesburg ensures your website isn’t just another digital placeholder—it becomes a strategic business asset.

Hello Errors: Global Quality Meets Local Relevance

Hello Errors brings a unique combination of global expertise and localized digital strategy to businesses in Johannesburg. While based internationally, Hello Errors has successfully collaborated with businesses around the world, including South African brands, to create high-performing websites that drive measurable results.

What Makes Hello Errors Different?

🚀 Innovative Technologies: From ReactJS and Angular to Laravel and Next.js, Hello Errors uses cutting-edge tech stacks tailored to each project.

🎯 Results-Oriented Process: Every website is designed with performance metrics in mind—traffic, bounce rate, session duration, and conversions.

🎨 Design-First Approach: UI/UX is not an afterthought. It’s a core element of every build.

💡 Tailored Solutions: No one-size-fits-all. Every business gets a unique digital strategy.

🌐 Global Standards, Local Solutions: Websites are optimized for both global scalability and local Johannesburg visibility.

Unique Features Offered by Hello Errors

Unlike many digital agencies that offer only the basics, Hello Errors delivers end-to-end services designed to make your online presence robust, relevant, and ROI-driven.

1. Dynamic, Scalable Web Applications

Need more than a brochure site? Hello Errors builds scalable web apps with custom dashboards, CRM systems, eCommerce functionalities, and more. Whether you're a logistics company or an online store in Johannesburg, we deliver custom tech tailored to your workflow.

2. Progressive Web Apps (PWAs)

As mobile usage increases, businesses are turning to PWAs to give users an app-like experience—without needing to download anything. PWAs load faster, work offline, and can be added to home screens. Hello Errors specializes in PWA development for modern brands.

3. Maintenance & Performance Optimization

A website’s job isn’t done after launch. Hello Errors provides ongoing support with:

Page speed improvements

Bug fixes and security patches

SEO monitoring and updates

UI/UX enhancements

This is critical for any website developer in Johannesburg looking to build long-term relationships.

4. Multilingual Support

Johannesburg is a diverse, multilingual city. Want to target audiences in English, Afrikaans, and Zulu? Hello Errors can develop multilingual websites with seamless language-switching features to boost inclusivity and engagement.

5. Conversion-Focused Design

We don’t just build websites—we build user journeys. Hello Errors integrates design psychology and strategic placement of CTAs (Call to Actions) to help increase leads, sales, and sign-ups.

How Hello Errors Supports Diverse Industries in Johannesburg

Johannesburg is home to businesses across industries—from hospitality and finance to retail and education. Hello Errors understands the nuances of different markets and crafts websites accordingly.

Some sectors we support:

🏥 Healthcare: HIPAA-compliant, appointment booking, and telehealth-ready platforms.

🛍️ Retail & eCommerce: Custom shopping experiences with integrated payment gateways.

🎓 Education: School portals, LMS platforms, and student dashboards.

🏢 Corporate & B2B: Enterprise websites with dynamic content and professional UX.

We bring industry-specific solutions that match your market, audience, and goals.

The Hello Errors Process: Designed for Success

Here’s a glimpse into our collaborative and agile approach as your website developer in Johannesburg:

Discovery & Consultation – Understanding your business, users, and competitors.

Design Planning – Wireframing, UX mapping, and prototyping.

Development – Responsive coding, CMS integration, and performance tuning.

Testing & QA – Ensuring smooth functionality across browsers and devices.

Launch & Optimization – Live deployment with SEO and analytics setup.

Ongoing Support – We stay with you post-launch to ensure continued success.

This full-stack development cycle ensures you get a reliable, stunning, and future-ready website.

Testimonials from Around the Globe

Hello Errors is proud to have received stellar feedback from clients across continents. Our clients value us for our responsiveness, technical excellence, and ability to translate business goals into digital reality.

Whether you’re a solo entrepreneur, a fast-growing startup, or an established brand in Johannesburg—Hello Errors is ready to be your trusted website developer in Johannesburg.

Let’s Create Digital Impact Together

It’s not enough to be online. You need to own your space online. With the right website, you gain:

Authority in your niche

A marketing asset that works 24/7

A better user experience for your clients

Tools for lead generation, engagement, and sales

Johannesburg businesses—it's time to elevate your digital presence with Hello Errors. We’re here to build websites that wow, engage, and perform.

🌐 Visit us at https://helloerrors.in 📩 Reach out for a FREE digital strategy session 📞 Let’s talk about your next web project today!

[wizorgltd]

Custom Mobile Apps That Enhance User Engagement

Wizorg excels in full stack JavaScript development, using ReactJS and NodeJS to build scalable, dynamic apps. In mobile app development, the team creates responsive, cross-platform solutions designed for exceptional user experiences. Cloud infrastructure is another area of expertise; they set up and optimize AWS installations for seamless, effective operation. The company's e-commerce solutions enable businesses to thrive in the modern digital world, while their UI/UX design focuses on creating user-friendly, captivating interfaces. Committed to building digital environments that foster development and innovation, Wizorg combines technical expertise with creativity.

For more information visit the website:-

[nectarbitss]

Flutter Developer Hiring Costs in 2025: A Complete Breakdown

In today’s fast-evolving tech landscape, Flutter stands out as a game-changer. With a single codebase, businesses can develop apps for iOS app development, Android app development, and even desktop platforms—saving both time and money. In 2025, one key question businesses are asking is: How much does it cost to hire a Flutter developer?

This guide explores the cost to hire a Flutter developer, factors influencing pricing, and tips to optimize your hiring process.

Factors Influencing Flutter Developer Pricing

1. App Complexity

The complexity of your app significantly impacts development costs:

Simple Apps – Basic UI & authentication: $10,000–$25,000

Medium Complexity Apps – API integrations, real-time features: $25,000–$50,000

Complex Apps – AI/ML, AR/VR, enterprise features: $50,000–$200,000+

2. Developer Expertise

The experience level of a professional Flutter app development expert determines hourly rates:

Junior Developers (0-3 years) – $15–$25/hour

Mid-Level Developers (3-5 years) – $25–$50/hour

Senior Developers (5+ years) – $50–$150/hour

3. Engagement Models

How you hire also affects pricing:

Freelancers – Short-term projects, $20–$100/hour

Dedicated Teams – Long-term projects, $25,000–$200,000+

In-House Teams – High initial investment, $80,000–$160,000/year

How to Optimize Your Hiring Costs

1. Start with an MVP

Building a Minimum Viable Product (MVP) lets you test your idea with minimal investment before scaling up.

2. Leverage Pre-Built Widgets

Flutter’s extensive widget library can save development time and reduce costs for your professional Flutter app development project.

3. Outsource to Cost-Effective Regions

Hiring from regions like India or Eastern Europe can significantly lower costs. In India, you can hire skilled Flutter developers for as low as $20/hour.

4. Choose the Right Engagement Model

For startups, outsourcing or hiring freelancers is more cost-effective than an in-house team. However, dedicated team augmentation is ideal for long-term projects.

Comparing Flutter with Other Frameworks

ReactJS Developer Cost – $30–$150/hour, making it slightly more expensive.

PHP Developer Rates – $20–$100/hour, but lacks cross-platform capabilities.

Laravel Developer Rates – Similar to PHP, more suited for web development.

The Future of Flutter Development

As businesses demand faster, more efficient cross-platform solutions, Flutter’s popularity will continue to soar. Whether you’re hiring locally or outsourcing, understanding the cost to hire a Flutter developer will help you make smart, cost-effective hiring decisions.

Ready to build your next mobile app? Explore your options and hire top Flutter developers to bring your vision to life! 

Read Our Blog : Cost to Hire Flutter Developer: What to Expect in 2025?

[jellyfishtechnologies]

Hire Vetted Node.js Developers

Our trained ReactJS engineers are excellent at producing scalable, interactive, and high-performing front-end solutions, guaranteeing the rapid and effective creation of user-focused online apps. We promise excellent outcomes, supported by strong NDA-backed secrecy and 100% quality assurance, thanks to our more than five years of experience and superior ReactJS competence.

We take pleasure in developing creative solutions that are suited to your company's demands and are trusted by multinational corporations. Our staff can handle projects of any size, whether you're creating dynamic user interfaces, single-page apps, or intricate online platforms.

We guarantee flawless performance, quick loading times, and an engaging user experience. From the first concept to the last deployment, we collaborate closely with you to realize your vision. To explore how we might help you reach your objectives, get in touch with us right now with your complete name, phone number, business email, company name, and a brief explanation of your question.

[learntechsolution]

Implementing a date picker in a React app can be done using various libraries, and one popular choice is react-datepicker. Here's a step-by-step guide on how to implement a date picker using this library

[learn-techsolution]

Implementing a date picker in a React app can be done using various libraries, and one popular choice is react-datepicker. Here's a step-by-step guide on how to implement a date picker using this library

[learntech-solution]

Implementing a date picker in a React app can be done using various libraries, and one popular choice is react-datepicker. Here's a step-by-step guide on how to implement a date picker using this library

[learn-tech-solution]

Implementing a date picker in a React app can be done using various libraries, and one popular choice is react-datepicker. Here's a step-by-step guide on how to implement a date picker using this library