//Zero Dark Thirty

//takes in a num, strips zeros from that num, spits num back out.

function zeroDarkThirty(n) {
  if(!n){
    return NaN;
  }
  var str = n.toString();
  var newStr = '';
  // str[0] .. str[1] .. str[str.length-1]
  //initialization; continuing operation; change
  for(var i = 0; i < str.length; i++){
      var char = Number(str[i]);
      if (char){
        newStr += char;
      }
    }

    return Number(newStr);
}

zeroDarkThirty(13120123024014012401240)