---
title: expressionBlock
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/nsexpression/expressionblock
---

# expressionBlock

The block that executes to evaluate the expression.

## Declaration

```swift
var expressionBlock: (Any?, [NSExpression], NSMutableDictionary?) -> Any { get }
```

## See Also

### Related Documentation

- [init(block:arguments:)](foundation/nsexpression/init(block:arguments:).md)