function baseSortBy(array, comparer) {
	    var length = array.length;

	    array.sort(comparer);
	    while (length--) {
	      array[length] = array[length].value;
	    }
	    return array;
	  }
The base implementation of `_.sortBy` and `_.sortByAll` which uses `comparer`
to define the sort order of `array` and replaces criteria objects with their
corresponding values.

@private
@param {Array} array The array to sort.
@param {Function} comparer The function to define sort order.
@returns {Array} Returns `array`.