React Lifecycle Components

React Updating Render Method | Components Lifecycle

The Render Method -
The render() method is the only required method in a class component.

The render() method is called when a component gets updated and re-render the HTML to the DOM including the new changes.

Explore to Understand  - React Lifecycle Components

Note: The render() will not be invoked if shouldComponentUpdate() returns false.

As an Example,
class Header extends React.Component {
    constructor(props) {
      this.state = {color: "red"};
    changeColor = () => {
      this.setState({color: "blue"});
    render() {
      return (
            <h2>My Color is {this.state.color}</h2>
            <button type="button" onClick={this.changeColor}>Change color</button>

Result of this example is – My color is blue


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