---
title: freeCapacity
framework: Swift
role: symbol
role_heading: Instance Property
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: swift/uniquearray/freecapacity
---

# freeCapacity

The number of additional elements that can be added to this array without reallocating its storage.

## Declaration

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

## Discussion

Discussion note: O(1)