1. require vs. Import
// ES5
var React = require('react');

// ES6
import React from 'react';

// ES5
module.exports = Component;

// ES6
export default Component;

// ES5
var MyComponent = React.createClass({
render: function() {
return(
<h3>Hello JavaTpoint</h3>
);
}
});

// ES6
class MyComponent extends React.Component {
render() {
return(
<h3>Hello Javatpoint</h3>
);
}
}

// ES5
var App = React.createClass({
propTypes: { name: React.PropTypes.string },
render: function() {
return(
<h3>Hello, {this.props.name}!</h3>
);
}
});

// ES6
class App extends React.Component {
render() {
return(
<h3>Hello, {this.props.name}!</h3>
);
}
}

A great use case for useImperativeHandle in React is to expose specific methods or actions of a child component (e.g., triggering a focus or clearing an input) to a parent component while keeping other internal logic encapsulated.