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What is React JS?

Let us give you a brief introduction to React. In the world of web development, React is the most in-demand JavaScript library available. There are quite a few benefits of choosing React over other frameworks such as Angular.js. The React js library was specifically created by the Facebook software engineer Jordan Walker to build fast and interactive UIs for web and mobile applications. This open-source front-end library is component-based and is responsible purely for the view layer of the application. The view layer is the one that is responsible for the look and feel of the app in the MVC architecture.

React JS is highly sought after for its versatility and ability to simplify the building of apps and websites alongside creating UI test cases and reusing existing website code to improve overall UI and web application performance.

How to hire for React JS?

Define your needs

To find a perfect fit for your team, you need to establish who that would be. To give you some examples: a good teammate, excellent level of English, business knowledge, with 3 years of experience, growth-attitude, etc.

Build a process

To filter the best possible hires, you need a set of steps. We call it a hiring funnel (it’s a lot like a sales funnel). Establish how you want to check your candidate’s skills, way of thinking, culture, and team fit. Prepare questions in advance and take a team member to the interview.

Overcome obstacles

Hiring React JS developers seems difficult because there are a lot of them in the market (but not everyone as experienced and promising as you wish), and there is also high demand. A well-thought-out process is your key to overcome these obstacles.

Here are 10 common React JS development interview questions that can help you hire React JS developers that deserve a place on your team

10 Companies That Use React JS

React JS is so popular, quite a few major business enterprises are well-acquainted with the software. Companies that use React JS include the following:

Why use React JS for developing web apps?

1. Easy to Learn and Use

ReactJS is much easier to learn and use. It comes with a good supply of documentation, tutorials, and training resources. Any developer who comes from a JavaScript background can easily understand and start creating web apps using React in a few days. It is the V(view part) in the MVC (Model-View-Controller) model, and referred to as ?one of the JavaScript frameworks.? It is not fully featured but has the advantage of open-source JavaScript User Interface(UI) library, which helps to execute the task in a better manner.

2. Creating Dynamic Web Applications Becomes Easier

To create a dynamic web application specifically with HTML strings was tricky because it requires a complex coding, but React JS solved that issue and makes it easier. It provides less coding and gives more functionality. It makes use of the JSX(JavaScript Extension), which is a particular syntax letting HTML quotes and HTML tag syntax to render particular subcomponents. It also supports the building of machine-readable codes.

3. Reusable Components

A ReactJS web application is made up of multiple components, and each component has its own logic and controls. These components are responsible for outputting a small, reusable piece of HTML code which can be reused wherever you need them. The reusable code helps to make your apps easier to develop and maintain. These Components can be nested with other components to allow complex applications to be built of simple building blocks. ReactJS uses virtual DOM based mechanism to fill data in HTML DOM. The virtual DOM works fast as it only changes individual DOM elements instead of reloading complete DOM every time.

4. Performance Enhancement

ReactJS improves performance due to virtual DOM. The DOM is a cross-platform and programming API which deals with HTML, XML or XHTML. Most of the developers faced the problem when the DOM was updated, which slowed down the performance of the application. ReactJS solved this problem by introducing virtual DOM. The React Virtual DOM exists entirely in memory and is a representation of the web browser's DOM. Due to this, when we write a React component, we did not write directly to the DOM. Instead, we are writing virtual components that react will turn into the DOM, leading to smoother and faster performance.

5. The Support of Handy Tools

React JS has also gained popularity due to the presence of a handy set of tools. These tools make the task of the developers understandable and easier. The React Developer Tools have been designed as Chrome and Firefox dev extension and allow you to inspect the React component hierarchies in the virtual DOM. It also allows you to select particular components and examine and edit their current props and state.

6. Known to be SEO Friendly

Traditional JavaScript frameworks have an issue in dealing with SEO. The search engines generally having trouble in reading JavaScript-heavy applications. Many web developers have often complained about this problem. ReactJS overcomes this problem that helps developers to be easily navigated on various search engines. It is because React.js applications can run on the server, and the virtual DOM will be rendering and returning to the browser as a regular web page.

7. The Benefit of Having JavaScript Library

Today, ReactJS is choosing by most of the web developers. It is because it is offering a very rich JavaScript library. The JavaScript library provides more flexibility to the web developers to choose the way they want.

8. Scope for Testing the Codes

ReactJS applications are extremely easy to test. It offers a scope where the developer can test and debug their codes with the help of native tools.

Disadvantages of React JS?

1. The high pace of development

The high pace of development has an advantage and disadvantage both. In case of disadvantage, since the environment continually changes so fast, some of the developers not feeling comfortable to relearn the new ways of doing things regularly. It may be hard for them to adopt all these changes with all the continuous updates. They need to be always updated with their skills and learn new ways of doing things.

2. Poor Documentation

It is another cons which are common for constantly updating technologies. React technologies updating and accelerating so fast that there is no time to make proper documentation. To overcome this, developers write instructions on their own with the evolving of new releases and tools in their current projects.

3. View Part

ReactJS Covers only the UI Layers of the app and nothing else. So you still need to choose some other technologies to get a complete tooling set for development in the project.

4. JSX as a barrier

ReactJS uses JSX. It's a syntax extension that allows HTML with JavaScript mixed together. This approach has its own benefits, but some members of the development community consider JSX as a barrier, especially for new developers. Developers complain about its complexity in the learning curve.

List of React JS Alternatives

1. Inferno JS

Inferno is one of the most high-profile alternatives to React JS. Clocking at 9k, Inferno JS is one of the quickest JavaScript libraries out there. It has been under active development since its first release in 2016.It supports hyper script, JSX, and Vanilla createElement method. Moreover, it provides support for several popular state management libraries such as Redux, MobX, and Cerebral JS.If you’re looking forward to building a high performing web app, then Inferno will be an amazing choice for you since it specialises in performance.

2. Preact

Clocked at 3k gzipped, Preact can be an excellent choice to build websites if performance is not the most profound concern for you. It is one of the smallest alternatives to React JS out there.It supports most of the modern-day browsers and IE9+. However, if you’re looking forward to a library that supports Facebook synthetic events system, then this is not the right choice.Preact offers several other features nifty features such as the rendering of both props and states, linked state, and the utilisation of ‘class’ instead of className.

3. React-Lite

The sole reason to create this library was to introduce the lighter version of React JS. Unlike Inferno and Preact, there is no compatibility package require. One can use it directly via webpack alias.Its compatibility level with other React components is much greater than the other two frameworks mentioned above. However, it is neither the fastest nor the smallest among all libraries.Neither does it supports server-side rendering, nor does it supports client-side hydration. Despite using React DOM servers for those functions, developers haven’t seen any seamless transitions.

4. Backbone JS

Backbone JS can be considered as the right alternative to React JS as it offers a structure to JS heavy applications by providing models with value-binding and custom events, collections with a rich API of various functions, views with declarative event handling, and connects all of them with your existing apps over a RESTful JSON interface.

5. Aurelia

Aurelia is written using ES2016. Without any external dependencies except polyfills, it seamlessly integrates with web components.Aurelia is made of smaller and more focused environments rather than following the monolithic framework approach. You can create applications using all or selected modules.It also offers two-way data binding to any object. Its extensible HTML compiler allows you to create custom HTML elements, control template generation, and attach new behaviours to the existing HTML elements.

6. Ember JS

It holds a strong position in top alternatives to React JS. Ember’s handlebars integrated templates allow you to do more by writing less code. This template updates automatically when the underlying data changes.It is designed to increase the productivity of a developer. It is API-friendly and helps one to enhance the development speed since it incorporates all the common idioms.

7. Riot JS

Riot JS allows us to create user interfaces with custom tags using simple and intriguing syntax. It also has a virtual DOM which is similar yet faster than React.If you’re looking for a small-sized UI library, then Riot is the right choice for you. It’s custom tags let you build complex views using HTML. Moreover, it does not require any extra HTML root elements, fancy custom attributes, or data attributes.

8. Mithril

Mithril is a modern-day client-side JS framework for developing Single Page Applications. It is fast, small (less than 10kb gzip), and offers routing and XHR utility out-of-the-box.

9. Vue JS

Vue is a progressive javascript framework that is used to create web user interfaces. The framework is entirely cerated and maintained by the community. Though it does have the backing of any tech giants, it is one of the best alternatives to React JS.Vue.js is flexible, handy conventions, developer-friendly, and considered as a trendiest JavaScript Frontend Framework. When it comes to performance, Vue.js is faster than React. Moreover, Vue makes the app development easy and smooth.The framework has a smooth learning curve so it is quite easy for developers to adopt it. Vue is a modular, high performant, and lightweight technology compared to React JS.

10. AngularJS

AngularJS is the best React JS alternative to build highly dynamic web, desktop, and mobile applications. It is an open source front-ed JavaScript framework that helps in simplifying and structuring the JavaScrpt Code.The technology allows building SIngle Page Application (SPA) in a very maintainable and clean way. The SPA could be an application or website that interacts with users not by loading entire new pages from a server, but by rewriting the current page dynamically.Invented by Google, it allows to build the fastest SPA that works 100% perfectly. Moreover, AngularJS is used by brands like Google, Amazon, Udemy, and more.Another reason that makes AngularJS as the best alternative to React JS is it empowers developers with a set of advanced AngularJS frameworks and AngularJS tools to build robust applications.

11. Cycle.js

Cycle.js is a reactive and functional JavaScript framework. It offers functional programming where the technology makes sure the functions should have only inputs and outputs, without any bug or side effect.With the help of Cycle.js, you can write clear asynchronous logic. The framework contains an API in its core. Apart from that Cycle.js contains streams, drivers, and functions.A Cycele.js app always covers three important components in it such as main(), driver, and run().

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