---
title: startIndex
framework: swift
role: symbol
role_heading: Instance Property
path: swift/unsafemutablebufferpointer/startindex
---

# startIndex

The index of the first element in a nonempty buffer.

## Declaration

```swift
var startIndex: Int { get }
```

## Discussion

Discussion The startIndex property of an UnsafeMutableBufferPointer instance is always zero.