String.toSpinalCase()

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function spinalCase(str) {
  // "It's such a fine line between stupid, and clever."
  // --David St. Hubbins
  let re = /[\s\_\-]/g;
  let newstr;
  newstr = str.replace(/([a-z])([A-Z])/g, '$1 $2').replace(re, '-').toLowerCase();

  return newstr;
}

spinalCase('This_Is_Spinal_Tap');

/* Note for the future: Improve this code, diminishing the number of lines and the length of the main line. 
    Tip: Place all the regex's in the first replace(), it will kill the first line and the long phrase. Also, make the return directly on the str parameter;) 
*/