Lokesh

Posted on Nov 1

What Is React?

#react #frontend #beginners #javascript

React is a JavaScript library used to build user interfaces (UI).

It is mainly used to create interactive and dynamic web applications.

For example, websites and applications often have:

React helps developers build and manage these user interfaces more easily.

Why Do We Use React?

When building a large website using only HTML, CSS, and JavaScript, managing the code can become difficult.

React helps by dividing the user interface into smaller, reusable parts called components.

For example:

Website
   │
   ├── Navbar
   ├── Product List
   │      ├── Product Card
   │      ├── Product Card
   │      └── Product Card
   │
   └── Footer

Each part can be created as a separate component.

A component is a reusable piece of the user interface.

For example:

function Welcome() {
    return <h1>Hello, World!</h1>;
}

This creates a simple React component.

We can use components to build different parts of a website.

React commonly uses JSX.

JSX allows us to write HTML-like code inside JavaScript.

Example:

function App() {
    return <h1>Hello, React!</h1>;
}

Although it looks similar to HTML, JSX is written inside JavaScript.

React helps update the user interface when data changes.

For example, if a user clicks a button and a value changes, React can update the relevant part of the screen.

This makes it useful for building interactive applications.

React can be used to build: