code: function baseUniq(array, isSorted, callback) {
      var index = -1,
          indexOf = getIndexOf(),
          length = array ? array.length : 0,
          result = [],
          seen = callback ? [] : result;
  
      while (++index < length) {
        var value = array[index],
            computed = callback ? callback(value, index, array) : value;
  
        if (isSorted
              ? !index || seen[seen.length - 1] !== computed
              : indexOf(seen, computed) < 0
            ) {
          if (callback) {
            seen.push(computed);
          }
          result.push(value);
        }
      }
      return result;
    }
docs: The base implementation of `_.uniq` without support for callback shorthands
  or `thisArg` binding.
  
  @private
  @param {Array} array The array to process.
  @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted.
  @param {Function} [callback] The function called per iteration.
  @returns {Array} Returns a duplicate-value-free array.