componentDidMount() method

React componentDidMount Method | Lifecycle Components

The componentDidMount Method -
The componentDidMount method is called after the component is rendered.
The componentDidMount method is called exactly once and when The component has been initialized.

Explore to Understand  - React Lifecycle Components

The componentDidMount method is used for -
1.      Handling the AJAX requests - GET/POST/PUT/DELETE
2.      Set timers using setTimeout or setInterval
3.      Set timers using setInterval

As an Example,
public class Header extends React.Component {
  constructor(props) {
    this.state = {msg: "welcome!"};

  componentDidMount() {
    setTimeout(() => {
      this.setState({msg: "welcome you Anil"})
    }, 1000)

  render() {
    return (

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