In React, props (short for properties) are a powerful mechanism for customizing and passing data from a parent to a child component. This feature allows us to create reusable and flexible components within the app.

Passing Props

Imagine we're building an online store.

In this scenario, we have a main component called App, and we want to display product information using a Product component. We can pass the product name and price as props from App to Product.

Here's how it's done in practice:

// Parent Component (`App`)
const App = () => (
  <>
    <h1>Online Store</h1>
    <Product name="Green iguana" price={579} />
  </>
);

In the App component, we include the Product component and pass it the props: name with the value "Green iguana" and price with the value 579.

Receiving and Using Props

Now, let's take a look at the Product component, which receives these props:

// Child Component (`Product`)
const Product = (props) => (
  <>
    <p>Product name: {props.name}</p>
    <p>Price: ${props.price}</p>
  </>
);

In the Product component, we define it to accept a single argument called props. Inside the component, we can access the values of these props using the dot (.) notation followed by the property name (e.g., props.name and props.price).

Practical Use

With this approach, we've created a Product component that can be reused with different product information multiple times. We can easily customize the text content of each Product component by providing different props.

<Product name="Yellow cheetah" price={1099} />
<Product name="Panda" price={449} />

Now we have the flexibility to display various product details using the same Product component.

Full App Code: