Props in React: A Complete Guide

Props in React: Props in React, short for Properties, are used to pass data from one component to another. They allow components to be dynamic and reusable, enhancing the efficiency of React applications. Pro props enable communication between components, making it a fundamental concept in React development.

Understanding Props with an Example

To understand props, let’s take a simple example: passing a message prop to a Greeting component.

function Greeting(props) {
  return <h1>{props.message}</h1>;
}

function App() {
  return <Greeting message="Hello, React!" />;
}

In the above code:

• Greeting component receives message as a prop.
• The App component passes “Hello, React!” as a prop to Greeting.
• The output will display: Hello, React!

What is State in ReactJS?(3+ easy example)

How to Pass Props in React?

Props are passed like attributes in JSX syntax. The syntax follows:

For example:

Key Characteristics of Props in React

• Read-Only: Props are immutable, meaning they cannot be modified inside the component.
• Passed from Parent to Child: A parent component can send data to a child component using props.
• Enable Dynamic Content: Props allow the rendering of dynamic content.

Components Communication using Props

React follows a one-way data flow, meaning data moves from parent to child. Here’s an example demonstrating component communication:

function ChildComponent(props) {
  return <h2>Received: {props.data}</h2>;
}

function ParentComponent() {
  return <ChildComponent data="Hello from Parent!" />;
}

Props vs. State in React

Feature	Props	State
Mutability	Immutable	Mutable
Ownership	Passed by parent	Managed within component
Usage	Used for communication	Used for managing local data

Common Use Cases of Props

• Passing data from a parent to a child component.
• Configuring components dynamically.
• Handling component reusability.

Frequently Asked Questions (FAQs)