freecodecamp problem

spinaltapcase.js

function spinalCase(str) {
    newString=str[0];
    for (i=1;i<str.length;i++) {
        console.log(str[i]);
        if (str[i] == ' ' || str[i] == '_') {
            if (newString[newString.length-1]!='-') {
                 newString+="-";     
            }
        } else if(str[i].toUpperCase()==str[i] && str[i]!=="-") {
            if (newString[newString.length-1]!='-') {
                 newString+="-";     
            }
            newString+=str[i];
        } else {
            newString+=str[i];
        }
        
    }
  // "It's such a fine line between stupid, and clever."
  // --David St. Hubbins
  return newString.toLowerCase();
}


spinalCase('This Is Spinal Tap');