---
title: "init(forKeyPath:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/nsexpression/init(forkeypath:)-98by"
---

# init(forKeyPath:)

Creates an expression using a key path you specify.

## Declaration

```swift
convenience init<Root, Value>(forKeyPath keyPath: KeyPath<Root, Value>)
```

## Parameters

- `keyPath`: The key path that the new expression evaluates.

## See Also

### Creating an Expression for a Value

- [init(forConstantValue:)](foundation/nsexpression/init(forconstantvalue:).md)
- [expressionForEvaluatedObject()](foundation/nsexpression/expressionforevaluatedobject().md)
- [init(forKeyPath:)](foundation/nsexpression/init(forkeypath:)-1aqf5.md)
- [init(forVariable:)](foundation/nsexpression/init(forvariable:).md)
- [expressionForAnyKey()](foundation/nsexpression/expressionforanykey().md)