# xarray.CFTimeIndex.is_unique
#### CFTimeIndex.is_unique
Return if the index has unique values.
The uniqueness check is based on exact equality of values. An index
with no repeated values returns `True`, otherwise `False`.
* **Returns:**
[`bool`](https://docs.python.org/3/builtins/functions.html#bool)
#### SEE ALSO
`Index.has_duplicates`
: Inverse method that checks if it has duplicate values.
### Examples
```pycon
>>> idx = pd.Index([1, 5, 7, 7])
>>> idx.is_unique
False
```
```pycon
>>> idx = pd.Index([1, 5, 7])
>>> idx.is_unique
True
```
```pycon
>>> idx = pd.Index(["Watermelon", "Orange", "Apple", "Watermelon"]).astype(
... "category"
... )
>>> idx.is_unique
False
```
```pycon
>>> idx = pd.Index(["Orange", "Apple", "Watermelon"]).astype("category")
>>> idx.is_unique
True
```