function doSomething(condition) {

  switch (condition) {

    case 'one':

      return 'one';

    break;

​

    case 'two':

      return 'two';

    break;

​

    case 'three':

      return 'three';

    break;

​

    default:

      return 'default';

    break;

  }

}

​

console.log(doSomething('one'));

console.log(doSomething('two'));

console.log(doSomething('three'));

console.log(doSomething('nothing'));