code: def _check_object_for_strings(values: np.ndarray) -> str:
      """
      Check if we can use string hashtable instead of object hashtable.
  
      Parameters
      ----------
      values : ndarray
  
      Returns
      -------
      str
      """
      ndtype = values.dtype.name
      if ndtype == "object":
          # it's cheaper to use a String Hash Table than Object; we infer
          # including nulls because that is the only difference between
          # StringHashTable and ObjectHashtable
          if lib.infer_dtype(values, skipna=False) in ["string"]:
              ndtype = "string"
      return ndtype
  
imports: from __future__ import annotations
  import operator
  from textwrap import dedent
  from typing import TYPE_CHECKING, Literal, cast
  import warnings
  import numpy
  from pandas._libs import algos, hashtable, iNaT, lib
  from pandas._typing import AnyArrayLike, ArrayLike, AxisInt, DtypeObj, TakeIndexer, npt
  from pandas.util._decorators import doc
  from pandas.util._exceptions import find_stack_level
  from pandas.core.dtypes.cast import construct_1d_object_array_from_listlike, infer_dtype_from_array, np_find_common_type
  from pandas.core.dtypes.common import ensure_float64, ensure_object, ensure_platform_int, is_array_like, is_bool_dtype, is_categorical_dtype, is_complex_dtype, is_extension_array_dtype, is_float_dtype, is_integer, is_integer_dtype, is_list_like, is_numeric_dtype, is_object_dtype, is_scalar, is_signed_integer_dtype, needs_i8_conversion
  from pandas.core.dtypes.concat import concat_compat
  from pandas.core.dtypes.dtypes import BaseMaskedDtype, ExtensionDtype, PandasDtype
  from pandas.core.dtypes.generic import ABCDatetimeArray, ABCExtensionArray, ABCIndex, ABCMultiIndex, ABCSeries, ABCTimedeltaArray
  from pandas.core.dtypes.missing import isna, na_value_for_dtype
  from pandas.core.array_algos.take import take_nd
  from pandas.core.construction import array, ensure_wrapped_if_datetimelike, extract_array
  from pandas.core.indexers import validate_indices
label_desc: Use image node_id 5 for calling a global function with example usage: _check_object_for_strings(values) and returns: ndtype