# `GSFont indexOfFeature:`

*Instance Method*

Index of a layout feature, or `NSNotFound` when the feature is not in the font.

## Declaration

```objc
- (NSUInteger) indexOfFeature:(GSFeature *) feature;
```

```python
indexOfFeature_(feature: GSFeature) -> int
```

## See Also

### Layout Features

- [`GSFont.features`](/Core/GlyphsCore/GSFont/features) — Layout features used when compiling OpenType feature code.
- [`GSFont countOfFeatures`](/Core/GlyphsCore/GSFont/countOfFeatures) — Number of layout features.
- [`GSFont objectInFeaturesAtIndex:`](/Core/GlyphsCore/GSFont/objectInFeaturesAtIndex:) — Layout feature at an index, or `nil` when the index is out of range.
- [`GSFont featureForTag:`](/Core/GlyphsCore/GSFont/featureForTag:) — Returns the first layout feature with a tag.
- [`GSFont activeFeatureForTag:`](/Core/GlyphsCore/GSFont/activeFeatureForTag:) — Returns the first enabled layout feature with a tag.
- [`GSFont automaticFeatureForTag:`](/Core/GlyphsCore/GSFont/automaticFeatureForTag:) — Returns the first automatic layout feature with a tag.
- [`GSFont automaticFeatureForTag:hasAnyFeature:`](/Core/GlyphsCore/GSFont/automaticFeatureForTag:hasAnyFeature:) — Returns the first automatic layout feature with a tag.
- [`GSFont addFeature:`](/Core/GlyphsCore/GSFont/addFeature:) — Adds a layout feature.
- [`GSFont insertObject:inFeaturesAtIndex:`](/Core/GlyphsCore/GSFont/insertObject:inFeaturesAtIndex:) — Inserts a layout feature at an index.
- [`GSFont removeFeature:`](/Core/GlyphsCore/GSFont/removeFeature:) — Removes a layout feature.
- [`GSFont removeObjectFromFeaturesAtIndex:`](/Core/GlyphsCore/GSFont/removeObjectFromFeaturesAtIndex:) — Removes the layout feature at an index.
- [`GSFont replaceObjectInFeaturesAtIndex:withObject:`](/Core/GlyphsCore/GSFont/replaceObjectInFeaturesAtIndex:withObject:) — Replaces the layout feature at an index.
- [`GSFont updateFeatures:`](/Core/GlyphsCore/GSFont/updateFeatures:) — Updates automatic layout features and classes.
- [`GSFont importFeatures:error:`](/Core/GlyphsCore/GSFont/importFeatures:error:) — Imports OpenType feature code into the font.