How to use constructor in react js?

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To use constructor in react js, You can use constructor keyword in class component that is how can use initialize constructor in react js and any constructor you can define their state, and props like those think, even you can bind function.

Today, I am going to show you, how to use constructor in react js.

Table of contents

• Install and create a new React app.
• Import react component.
• Create a Component.

Let’s start with the first step.

Step 1: Install and create a new React app.

First you have to install the React project. You should use create-react-app command to create a new React project.

npx create-react-app my-app
cd my-app
npm start

Step 2: Import react component.

After installing, you have to import your React component.

import React, { Component } from 'react';

Step 3: Create a Component.

You can use {this.state.count} to use constructor in react js.

<div>
  <p>Count: {this.state.count}</p>
    <button onClick={this.incrementCount}>Increment</button>
</div>

Use constructor example.

The below code is an example of a React. You have to import react and any constructor you can define their state, and props like those think, even you can use bind function constructor in react js.

App.js

import React, { Component } from 'react';

class App extends Component {
  constructor(props) {
    super(props); // Must call super(props) to access `this.props`
    this.state = {
      count: 0, // Initialize state
    };

    // Bind event handlers if needed
    this.incrementCount = this.incrementCount.bind(this);
  }

  incrementCount() {
    this.setState({ count: this.state.count + 1 });
  }

  render() {
    return (
      <div>
        <p>Count: {this.state.count}</p>
        <button onClick={this.incrementCount}>Increment</button>
      </div>
    );
  }
}

export default App;

In the above code example, I have used the constructor keyword to use constructor in react js.

Check the output of the above code.

All the best 👍