---
title: "init(forBlock:arguments:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/nsexpression/init(forblock:arguments:)"
---

# init(forBlock:arguments:)

## Declaration

```swift
init(forBlock block: @escaping (Any?, [NSExpression], NSMutableDictionary?) -> Any, arguments: [NSExpression]?)
```