ES6 Import and Export.

Person.js

const isAdult = (age) => {
    return age >= 18 ? true: false
}

export const isCanDrink = (age) => {
    return age >=20 ?true : false
}

//default export
const isSenior = (age) => {
    return age > 60 ? true : false
}

export default isSenior;

export {isAdult}



App.js

import isSenior, {isAdult, isCanDrink} from "./person";

console.log(isSenior(72));
console.log(isAdult(19));
console.log(isCanDrink(10));