---
title: isEqual
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/nsmaptablekeycallbacks/isequal
---

# isEqual

Points to the function which compares second and third parameters. If NULL, then == is used for comparison.

## Declaration

```swift
var isEqual: ((NSMapTable<AnyObject, AnyObject>, UnsafeRawPointer, UnsafeRawPointer) -> ObjCBool)?
```