What is the use of the arrow function?

The use of Arrow functions in React Native is to help reduce your application's memory consumption. It is done by reducing the CPU time required to iterate the over loops to generate the components necessary for your lists.

Here’s an example of Arrow function in render:
class Foo extends Component {
   handleClick() {
   console.log('Click happened');
}
render() {
   return <button onClick={() => this.handleClick()}>Click Me</button>;
}
}