Introduction to ReactJS (Beginners guide)
Tags: react, javascript, beginners
Published: 2022-12-31 00:09:39

The most popular open-source JavaScript library nowadays is ReactJS. It facilitates the development of amazing web applications with little effort and coding. ReactJS's primary goal is to create User Interfaces (UI) that increase the speed of apps.
ReactJS has its advantages and disadvantages. The advantages are:
 
**Ease of learning and usage:**

ReactJS is considerably simpler to use and understand. It includes a substantial amount of instruction manuals, guides, and training materials. Any developer with experience with JavaScript can quickly learn React and begin using it to build web applications.

**Components can be re-used:**

Each of the several components that make up a ReactJS web application has its logic and controls. These parts are in charge of producing a brief, reusable chunk of HTML code that you may use anywhere you need it. Reusable code makes it simpler to create and update your apps. The ability to stack these components with other components enables the construction of sophisticated applications from basic building blocks.

**Improved Speed and Performance:**

The majority of developers encountered an issue whenever the DOM was modified, which decreased the application's speed. By adding virtual DOM, ReactJS addressed this issue. (The DOM is a virtual representation of the document object model, it is a tree structure comprising XML, HTML, or XHTML documents.)
The React Virtual DOM is a representation of the DOM found in web browsers, and it resides entirely in memory. As a result, we don’t write directly to the DOM while creating a React component. Instead, we create virtual components that when activated, transform into the DOM, resulting in a quicker and more fluid performance.
The virtual DOM operates quickly because it simply modifies certain DOM components as opposed to refreshing the whole DOM each time.
Thanks to it, developers can now quickly produce apps that meet current requirements.

Cons of React

**The high pace of development:**
 
ReactJS is a popular and widely-used JavaScript library for building user interfaces, and as such, it is constantly being updated and improved upon.
While this can be a good thing in terms of getting access to new features and functionality, it can also be a disadvantage for developers who may struggle to keep up with the rapid pace of change. This can require a significant time investment in terms of learning new ways of doing things and staying current with the latest updates.
 
**Poor documentation:** 
 
When a technology is evolving as quickly as ReactJS, it can be difficult to keep the documentation up to date and complete. This can be frustrating for developers who rely on documentation as a reference and may have to spend extra time figuring out how to use new features or tools on their own.
 
**Limited part:** 
 
ReactJS is specifically designed to handle the UI (user interface) layer of an app, but it does not provide a complete toolset for full-stack development. This means that developers who are using ReactJS will need to use other technologies in conjunction with it to build a complete application.
 
**JSX as a barrier:**
ReactJS uses a syntax extension called JSX, which allows HTML and JavaScript to be mixed. While this approach has some benefits, some developers find it to be a barrier, particularly for those who are new to the technology. JSX can be complex and may require a steep learning curve, which can be frustrating for developers who are trying to get up to speed with ReactJS.


These article helps explain what you will need on your journey to become a proficient react developer: 

https://dev.to/haltim/react-fundamentals-the-essential-skills-for-its-developers-17k6

I will be explaining to the best of my ability the fundamentals of ReactJS and how you can create your first project with it.