var coffee, message;

message = "ready for some coffee ?";

coffee = function(msg = message) {
  var answer;
  answer = confirm(msg);
  return `Your answer is ${answer}`;
};

alert(coffee()); // <- parentheses needed.

alert(coffee("Chocolate ?"));

//`Best practice: parentheses always except at the outermost level.
alert(coffee("Tea, maybe ?"));

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