---
title: "JSObjectHasPropertyForKey(_:_:_:_:)"
framework: javascriptcore
role: symbol
role_heading: Function
path: "javascriptcore/jsobjecthaspropertyforkey(_:_:_:_:)"
---

# JSObjectHasPropertyForKey(_:_:_:_:)

Tests whether an object has the specified property using a JavaScript value as the property key.

## Declaration

```swift
func JSObjectHasPropertyForKey(_ ctx: JSContextRef!, _ object: JSObjectRef!, _ propertyKey: JSValueRef!, _ exception: UnsafeMutablePointer<JSValueRef?>!) -> Bool
```

## Parameters

- `ctx`: The execution context to use.
- `object`: The doc://com.apple.javascriptcore/documentation/JavaScriptCore/JSObjectRef to test.
- `propertyKey`: A doc://com.apple.javascriptcore/documentation/JavaScriptCore/JSValueRef that contains the property key to use when looking up the property.
- `exception`: A pointer to a doc://com.apple.javascriptcore/documentation/JavaScriptCore/JSValueRef to store an exception in, if any. Pass NULL to discard any exception.

## Return Value

Return Value true if the object has a property with a name that matches propertyKey; otherwise, false.

## Discussion

Discussion This function is the same as performing propertyKey in object from JavaScript.

## See Also

### Working with Objects

- [JSObjectCallAsConstructor(_:_:_:_:_:)](javascriptcore/jsobjectcallasconstructor(_:_:_:_:_:).md)
- [JSObjectCallAsFunction(_:_:_:_:_:_:)](javascriptcore/jsobjectcallasfunction(_:_:_:_:_:_:).md)
- [JSObjectCopyPropertyNames(_:_:)](javascriptcore/jsobjectcopypropertynames(_:_:).md)
- [JSObjectDeleteProperty(_:_:_:_:)](javascriptcore/jsobjectdeleteproperty(_:_:_:_:).md)
- [JSObjectGetPrivate(_:)](javascriptcore/jsobjectgetprivate(_:).md)
- [JSObjectGetProperty(_:_:_:_:)](javascriptcore/jsobjectgetproperty(_:_:_:_:).md)
- [JSObjectGetPropertyAtIndex(_:_:_:_:)](javascriptcore/jsobjectgetpropertyatindex(_:_:_:_:).md)
- [JSObjectGetPrototype(_:_:)](javascriptcore/jsobjectgetprototype(_:_:).md)
- [JSObjectHasProperty(_:_:_:)](javascriptcore/jsobjecthasproperty(_:_:_:).md)
- [JSObjectIsConstructor(_:_:)](javascriptcore/jsobjectisconstructor(_:_:).md)
- [JSObjectIsFunction(_:_:)](javascriptcore/jsobjectisfunction(_:_:).md)
- [JSObjectMake(_:_:_:)](javascriptcore/jsobjectmake(_:_:_:).md)
- [JSObjectMakeArray(_:_:_:_:)](javascriptcore/jsobjectmakearray(_:_:_:_:).md)
- [JSObjectMakeConstructor(_:_:_:)](javascriptcore/jsobjectmakeconstructor(_:_:_:).md)
- [JSObjectMakeDate(_:_:_:_:)](javascriptcore/jsobjectmakedate(_:_:_:_:).md)