<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_zarr(self, store=None, mode='w-', synchronizer=None, group=None, encoding=None, compute=True, consolidated=False):
 """Write dataset contents to a zarr group. .. note:: Experimental The Zarr backend is new and experimental. Please report any unexpected behavior via github issues. Parameters store : MutableMapping or str, optional Store or path to directory in file system. mode : {'w', 'w-'} Persistence mode: 'w' means create (overwrite if exists); 'w-' means create (fail if exists). synchronizer : object, optional Array synchronizer group : str, obtional Group path. (a.k.a. `path` in zarr terminology.) encoding : dict, optional Nested dictionary with variable names as keys and dictionaries of variable specific encodings as values, e.g., compute: bool, optional If True compute immediately, otherwise return a ``dask.delayed.Delayed`` object that can be computed later. consolidated: bool, optional If True, apply zarr's `consolidate_metadata` function to the store after writing. References https://zarr.readthedocs.io/ """

        if encoding is None:
            encoding = {}
        if mode not in ['w', 'w-']:
            # TODO: figure out how to handle 'r+' and 'a'
            raise ValueError("The only supported options for mode are 'w' "
                             "and 'w-'.")
        from ..backends.api import to_zarr
        return to_zarr(self, store=store, mode=mode, synchronizer=synchronizer,
                       group=group, encoding=encoding, compute=compute,
                       consolidated=consolidated)