http://www.freecodecamp.com/minsooshin 's solution for Bonfire: Spinal Tap Case

bonfire-spinal-tap-case.js

// Bonfire: Spinal Tap Case
// Author: @minsooshin
// Challenge: http://www.freecodecamp.com/challenges/bonfire-spinal-tap-case
// Learn to Code at Free Code Camp (www.freecodecamp.com)

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

spinalCase("This Is Spinal Tap");
spinalCase("thisIsSpinalTap");