---
title: ArraySlice.Index
framework: swift
role: symbol
role_heading: Type Alias
path: swift/arrayslice/index
---

# ArraySlice.Index

The index type for arrays, Int.

## Declaration

```swift
typealias Index = Int
```

## Discussion

Discussion ArraySlice instances are not always indexed from zero. Use startIndex and endIndex as the bounds for any element access, instead of 0 and count.