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

# buildPartialBlock(accumulated:next:)

Combines an accumulated component with a new component.

## Declaration

```swift
static func buildPartialBlock(accumulated: [PreviewCamera], next: [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(first:)](developertoolssupport/previewcamerabuilder/buildpartialblock(first:).md)