code: function sortedUniqBy(array, iteratee) {
        return (array && array.length)
          ? baseSortedUniq(array, getIteratee(iteratee, 2))
          : [];
      }
docs: This method is like `_.uniqBy` except that it's designed and optimized
  for sorted arrays.
  
  @static
  @memberOf _
  @since 4.0.0
  @category Array
  @param {Array} array The array to inspect.
  @param {Function} [iteratee] The iteratee invoked per element.
  @returns {Array} Returns the new duplicate free array.
  @example
  
  _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
  // => [1.1, 2.3]