mahdiyazdani/componentWillUpdate.jsx

## componentWillUpdate.jsx
import React from 'react';

export class Example extends React.Component {
  componentWillUpdate(nextProps, nextState) {
    alert('Component is about to update!  Any second now!');
  }

  render() {
    return <h1>Hello world</h1>;
  }
}
	import React from 'react';

	export class Example extends React.Component {
	componentWillUpdate(nextProps, nextState) {
	alert('Component is about to update! Any second now!');
	}

	render() {
	return <h1>Hello world</h1>;
	}
	}