Javascript - Make switch: default restart prompt

Question

I am trying to ask the user a simple question:

// Write your code below!
var food = prompt("Do you like waffles?");

switch (food) {
    case "yes":
    case "Yes":
        alert("Good!");
        break;
    case "no":
    case "No":
        alert("But why!");
        break;
    default:
        var food = prompt("That's not an answer, Do you like waffles?");
        break;
}

The default works but only once. I want to re-prompt the user if he/she enters an answer that is not yes or no infinitely. What is going on here?

Answer 1

function askForFood( questionArgument ){
  var food = prompt( questionArgument );
  switch (food.toLowerCase()) { // be DRY! Use lowercase!
    case "yes":                 // And lowercase it is!
      alert("Good!");
      break;
    case "no":
      alert("But why!");
      break;
    default:
      askForFood("That's not an answer, Do you like waffles?"); // to hell with it
      break;
  }
}

askForFood("Do you like waffles?"); // First time ask nicely

Why the above works?
Cause the use of a function that's able to do repeat the work more times.
Simply pass your "Question" as an argument to the function.
case default: with that same function call, but usign a different question this time.

P.S: thanks to the use of toLowerCase() the user can also write "yeS" and your program will play ball with friends without caring much...

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If it's not for school, you could also play with your code and do it (I like it!) like this:

var questionary = {
  "yes" : "Good!",
  "no"  : "But why!",
};

function askForFood( question ){
  var answer = prompt( question ).toLowerCase();
  if(answer in questionary) alert( questionary[answer] ); // Self explanatory
  else askForFood( "That's not an answer" ); // ♫ do it again!
}
askForFood("Do you like waffles?");