---
title: "buildPartialBlock(first:)"
framework: developertoolssupport
role: symbol
role_heading: Type Method
path: "developertoolssupport/previewcamerabuilder/buildpartialblock(first:)"
---

# buildPartialBlock(first:)

Builds a partial result component from the first component.

## Declaration

```swift
static func buildPartialBlock(first: [PreviewCamera]) -> [PreviewCamera]
```

## See Also

### Building a preview camera

- [buildArray(_:)](developertoolssupport/previewcamerabuilder/buildarray(_:).md)
- [buildExpression(_:)](developertoolssupport/previewcamerabuilder/buildexpression(_:)-5okdh.md)
- [buildExpression(_:)](developertoolssupport/previewcamerabuilder/buildexpression(_:)-5t9d2.md)
- [buildPartialBlock(accumulated:next:)](developertoolssupport/previewcamerabuilder/buildpartialblock(accumulated:next:).md)