---
title: "prefix(upTo:)"
framework: swift-package-manager
role: symbol
role_heading: Instance Method
path: "swift-package-manager/documentation/packageplugin/filelist/prefix(upto:)"
---

# prefix(upTo:)

Inherited from Collection.prefix(upTo:).

## Declaration

```swift
func prefix(upTo end: Self.Index) -> Self.SubSequence
```