---
title: underestimatedCount
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/nsorderedset/underestimatedcount
---

# underestimatedCount

A value less than or equal to the number of elements in the collection.

## Declaration

```swift
@nonobjc var underestimatedCount: Int { get }
```

## Discussion

Discussion note: O(1).