What is React and Why is React the Most Popular JavaScript Framework?

What is React and Why is React the Most Popular JavaScript Framework
React is a JavaScript library for building fast and interactive user interfaces.
It was developed in 2011 at Facebook and currently, it’s the most popular JavaScript library for building user interfaces.
Stackoverflow most commonly used web frameworks
Source: Stackoverflow most commonly used web frameworks

This means if you want to expand your job opportunities, you should know react.
At the core of all react applications are components.
What is React and Why is React the Most Popular JavaScript Framework
Add react design/boxes

A component is essentially a piece of the user interface. Hence a react application is a group of independent and isolated components grouped to form the user interface.
Every react application has at least one component which is called the root component. The root component represents the internal application and contains other child components.
So every react application is essentially a tree of components.

Add design

Component implementation

Class AlidaSchool
{State = {};Render ()
{ React element }}

A component is typically implemented as a JavaScript class that has some state and render method.
The state is the data that we want to display when the component is rendered.
The render method is responsible for describing what the UI should look like. The output of the render method is a react element.

React or Angular
Both react and angular are similar in terms of their component based architecture. However angular is a framework - a complete solution - while react is a library.
React only takes care of rendering the view and making sure that the view is in sync with the state. That’s all that react does nothing more and nothing less, due to this react has a very small API to learn.
So when building applications with react we need to use other libraries for things like routing or calling HTTP services and so on. This can be beneficial because you get to choose the libraries that you prefer as opposed to sticking with what angular gives you which often breaks from one version to another.
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