# xarray.IndexVariable.concat

#### *classmethod* IndexVariable.concat(variables, dim='concat_dim', positions=None, shortcut=False, combine_attrs='override')[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/variable.py#L3184-L3235)

Specialized version of Variable.concat for IndexVariable objects.

This exists because we want to avoid converting Index objects to NumPy
arrays, if possible.