old_contents: function getFee(isMember) {
    return (isMember ? '$2.00' : '$10.00');
  }
  
  console.log(getFee(true));
  // expected output: "$2.00"
  
  console.log(getFee(false));
  // expected output: "$10.00"
  
  console.log(getFee(1));
  // expected output: "$2.00"
  
new_contents: function getFee(isMember) {
    return (isMember ? '$2.00' : '$10.00');
  }
  
  console.log(getFee(true));
  // expected output: "$2.00"
  
  console.log(getFee(false));
  // expected output: "$10.00"
  
  console.log(getFee(null));
  // expected output: "$10.00"
  
subject: Update expressions-conditionaloperators.js (#1620)