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Difference between Functional component and class-based component in React.

Functional component.Class-based component.
Functional component cannot have state ( before React hooks, now it can have state with React 16.8 or higher). It renders component only based on props that are supplied from the parent.A class-based component can have component level state.
Functional component are simple functions and light weighted. These are functions that accepts props as an argument and returns a React element.A class-based component is a complex structure. It is an instance of a class derived from React. Component class. The class must implement a render() member function which returns a React component to be rendered.
functional component cannot use lifecycle methods.The class-based component use lifecycle methods such as componentDidMount.

Functional component example:

function Hello(props) {
  return <h1>Hello, {props.userName}</h1>;
}

Class based component example:

class Hello extends React.Component {
  render() {
    return <h1>Hello, {this.props.userName}</h1>;
  }
}

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