What is Props in React?

In React, “props” is short for “properties,” and it refers to a mechanism for passing data from a parent component to a child component. Props allow you to make your components more flexible and reusable by providing data and configuration to child components.

Here are some key points about React props:

Data Flow: React follows a unidirectional data flow, which means data is typically passed from parent components down to their child components using props. Child components receive and use this data but cannot modify it directly. This data flow pattern helps create predictable and maintainable code.
Immutable: Props are read-only. Once a component receives props, it cannot change them. This immutability ensures that child components can rely on the data passed to them without worrying about unexpected modifications.
Usage: To pass props from a parent component to a child component, you include them as attributes in the child component’s JSX when rendering it. The child component can then access these props as arguments in its function or class.

Here’s a simple example of how props are used in React:

import React from 'react';

function ParentComponent() {
  const greeting = 'Hello from Parent!';

  return (
    <ChildComponent message={greeting} />
  );
}

function ChildComponent(props) {
  return (
    <div>
      <p>{props.message}</p>
    </div>
  );
}

In this example, the ParentComponent renders the ChildComponent and passes the message prop to it. The ChildComponent receives this prop as an argument in its function and displays it in its rendered output.

Props are a fundamental concept in React and play a vital role in building reusable and composable components. They allow you to customize the behavior and appearance of child components based on the data and configuration provided by their parent components.

Here are some key points about React props:

Data Flow: React follows a unidirectional data flow, which means data is typically passed from parent components down to their child components using props. Child components receive and use this data but cannot modify it directly. This data flow pattern helps create predictable and maintainable code.
Immutable: Props are read-only. Once a component receives props, it cannot change them. This immutability ensures that child components can rely on the data passed to them without worrying about unexpected modifications.
Usage: To pass props from a parent component to a child component, you include them as attributes in the child component’s JSX when rendering it. The child component can then access these props as arguments in its function or class.

Here’s a simple example of how props are used in React:

import React from 'react';

function ParentComponent() {
  const greeting = 'Hello from Parent!';

  return (
    <ChildComponent message={greeting} />
  );
}

function ChildComponent(props) {
  return (
    <div>
      <p>{props.message}</p>
    </div>
  );
}

Props in React is the argument passed to React component through HTML Attribute. either String as argument or variable or object to React Component an attribute is used in HTML to pass to React Component is Called Props in React

Example

class Name extends React.Component {
  render() {
    return <h2>my name is  {this.props.name}!</h2>;
  }
}

ReactDOM.render(<Name name="yashpal"  />, document.getElementById('root'));

Table of Contents

How do pass variables in React Props?

to pass variable as an argument for React Props just use curly bracket for variable Props

Example

ReactDOM.render(<Name name={variable name} />, document.getElementById('root'));

How to object in React Props?

to pass object in React Props just use curly braket and pass object in HTML attribute

Example:

const fullname = {name: "yashpal", model: "singh"};
ReactDOM.render(<Name name={fullname}    />, document.getElementById('root'));

How to use Props in Constructor?

in-class Constructor props have to be passed to super() as an argument

Syntax

class Name extends React.Component {
  constructor(props) {
    super(props);
  }
  render() {
    return <h2>my name is {this.props.name} </h2>;
  }
}

ReactDOM.render(<Name name="yashpal"/>, document.getElementById('root'));

How do pass variables in React Props?

How to object in React Props?

How to use Props in Constructor?

Leave a Comment Cancel reply