---
title: "subscript(_:)"
framework: coremedia
role: symbol
role_heading: Instance Subscript
path: "coremedia/cmformatdescription/extensions-swift.struct/subscript(_:)-80zh8"
---

# subscript(_:)

## Declaration

```swift
subscript(key: CMFormatDescription.Extensions.Key) -> CMFormatDescription.Extensions.Value? { get set }
```

## See Also

### Finding Extension Elements

- [subscript(_:)](coremedia/cmformatdescription/extensions-swift.struct/subscript(_:)-1c6vg.md)