---
title: describe
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/nshashtablecallbacks/describe
---

# describe

Points to the function that produces an autoreleased NSString * describing the given element. If NULL, then the hash table produces a generic string description.

## Declaration

```swift
var describe: ((NSHashTable<AnyObject>, UnsafeRawPointer) -> String?)?
```