---
title: "formIndex(_:offsetBy:)"
framework: swift-package-manager
role: symbol
role_heading: Instance Method
path: "swift-package-manager/documentation/packageplugin/filelist/formindex(_:offsetby:)"
---

# formIndex(_:offsetBy:)

Inherited from Collection.formIndex(_:offsetBy:).

## Declaration

```swift
func formIndex(_ i: inout Self.Index, offsetBy distance: Int)
```