Can I safely pass an undefined object property to a switch in JavaScript?

Q. Can I safely pass an undefined object property to a switch in JavaScript?

A. Yes, I can!

let myObj = {};
let testIt = myObj => {
  switch(myObj.undef) {
    case 'Some Value':
      return 'undef is defined';
      break;
    default:
      return 'undef is undefined but there is no error';
      break;
  };  
};
console.log(testIt(myObj)); // => "undef is undefined but there is no error"

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