Deletes the specified fields from the hash stored at key. The number of fields that were removed from the hash is returned on resolution (non including non existing fields).
|key||string||key holding the hash to delete the fields of.|
|fields||string||fields to delete from the hash.|
|Type||Resolves with||Rejected when|
|Promise<number>||On success, the promise resolves with the number of fields that were removed from the hash, not including specified, but non existing, fields.|