spinal tap case

function spinalCase(str) {
  //1. remove spaces, add - 
  //2. add - where capital letter
  //3. remove underscore, add -
  //4. remove spaces, add -
  //5. remove 
  
  var newStr = str.replace(/ ([A-Z])/g, '-$1');
  newStr = newStr.replace(/\s|_/g, '-'); 
  return newStr.toLowerCase();
}

spinalCase('thisIsSpinalTap');
//This Is Spinal Tap
//thisIsSpinalTap