default

switch (expression) {
  case value1:
    //Statements executed when the result of expression matches value1
    [break;]
  default:
    //Statements executed when none of the values match the value of the expression
    [break;]
}

export default nameN 

switch (expr) {
  case 'Oranges':
    console.log('Oranges are $0.59 a pound.');
    break;
  case 'Apples':
    console.log('Apples are $0.32 a pound.');
    break;
  default:
    console.log('Sorry, we are out of ' + expr + '.');
}

// module "my-module.js"
let cube = function cube(x) {
  return x * x * x;
};
export default cube;

// module "my-module.js"
import myFunction from 'my-module';
console.log(myFunction(3)); // 27