function spinalCase(str) {


let arr = [];



for (let i = 0; i < str.length; i++) {

  arr.push(str[i]);

}


for (let i = 0; i < arr.length; i++) {

  if (arr[i].match(/[A-Z]/g)) {

    if (i > 0 && !arr[i - 1].match(/[A-Za-z]/g)) {

    arr.splice(i - 1, 1);

    }


  } else if (arr[i].match(/\s/g)) {

    arr.splice(i, 1, '-');

  }


}


arr = arr.join('');

console.log(arr);

arr = arr.replace(/([A-Z])/g, '-$1');

arr = arr.replace(/(\s)/g, '-$1');

arr = arr.toLowerCase();

if (arr[0] === '-') {

arr = arr.substr(1);

}


  return arr;
}




console.log(spinalCase('Teletubbies say Eh-oh'));