How to call the function from another component in React Native?

Here’s an example to call a function from another component in React Native:

Create a function, sayHello and then use it as a named-function

const hellos = ['Hola', 'Salut', 'Ciao', 'Ahoj', 'Annyeong-haseyo', 'Aloha', 'Howdy', 'Ni Hao', 'Konnichiwa'];
const sayHello = function() {
return hellos[Math.floor((Math.random()*hellos.length))];
};

export { sayHello };

Now, you can import into whichever component you wish to share the functionality like this:

import { sayHello } from './hello';
class CompA extends React.Component {
    render() {
       return <span>{sayHello()}</span>;
    }
}
class CompB extends React.Component {
    render() {
       return <span>{sayHello()}</span>;
   }
}

render(<span>
<CompA />
<CompB />
</span>, document.querySelector('#app'));