code: function(num) {
              if(typeof num !== "number") {
                  return NaN;
              }
              var isNegative = (num < 0),
                  result;
  
              if(isNegative) {
                  num = -num;
              }
              if(num < 10) {
                  num += (10 - num) / 10;
              }
              result = this.logBaseTen(num);
              return (isNegative) ? -result : result;
          }
docs: transforms numbers to a normalized log scale that can handle negative numbers rounds to four decimal points of precision