React Constructor Method | Components Lifecycle

The Constructor Method -

The constructor() method is called when the component is initiated (before anything else). Here we can set up the initial state and other initial values.

The constructor() method is called with the props, as arguments and we should always start by calling the super(props) before initiated anything else.

Explore to Understand  - React Lifecycle Components

As an Example,

import React from 'react';

class Header extends React.Component {

  constructor(props) {

    super(props);

    this.state = {msg: "welcome!"};

  }

  render() {

    return (

      <h2>{this.state.msg} you anil</h2>

    );

  }

}