React Props :-
React Props (short for properties) are a way to pass data from a parent component to a child component. Props allow you to customize the behavior of a component and make it reusable.
In React, props are passed down as an object and are read-only within the child component. This means that a child component can't modify the props passed down from its parent.
Here's an example of how to use props in a React component:
import React from 'react';
function Greeting(props) {
return <h1>Hello, {props.name}!</h1>;
}
export default Greeting;
In this example, we have defined a functional component called Greeting that takes a single prop called name. The name prop is used to customize the greeting displayed by the component.
To use the Greeting component, we can pass a name prop to it like this:
import React from 'react';
import Greeting from './Greeting';
function App() {
return (
<div>
<Greeting name="Alice" />
<Greeting name="Bob" />
</div>
);
}
export default App;
In this example, we have defined an App component that renders two Greeting components with different name props. When the Greeting component is rendered, it will display a personalized greeting based on the name prop passed down from the parent component.
In addition to passing simple data types like strings and numbers, props can also be used to pass functions and even other React components. This makes it possible to build complex, reusable UI elements in React.
Overall, React Props are an essential part of building reusable components in React. By passing data down from a parent component to a child component, you can customize the behavior of the component and make it more flexible.
Props are passed down from a parent component to a child component using the props object. The props object is read-only within the child component, meaning that the child component can't modify the props passed down from its parent.
Props can be any JavaScript value, including strings, numbers, boolean values, functions, and even other React components.
When a component receives new props, it will re-render with the new data. This allows you to update the behavior of a component based on changes in its props.
Props can be validated using PropTypes, a type-checking library included with React. PropTypes can help catch errors early and ensure that your components are used correctly.
Here's an example of how to use PropTypes to validate props:
import React from 'react';
import PropTypes from 'prop-types';
function Greeting(props) {
return <h1>Hello, {props.name}!</h1>;
}
Greeting.propTypes = {
name: PropTypes.string.isRequired,
};
export default Greeting;
In this example, we have added a PropTypes validation to the Greeting component. The name prop is required to be a string, and if it's missing or not a string, React will throw a warning in the console.
Overall, React Props are an essential part of building flexible, reusable components in React. By passing data down from a parent component to a child component, you can customize the behavior of the component and make it more dynamic. With the help of PropTypes, you can catch errors early and ensure that your components are used correctly.
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