docs: function UcFirst(str) {
      var firstChar = "";
      var leftChars = "";
      var retStr;
  
      if (typeof str == "string" && str.length > 0) {
          firstChar = str[0].toUpperCase();
          leftChars = str.slice(1, str.length);
      }
  
      retStr = firstChar + leftChars;
      return retStr;
  }