---
title: "setObject(_:forKeyedSubscript:)"
framework: javascriptcore
role: symbol
role_heading: Instance Method
path: "javascriptcore/jscontext/setobject(_:forkeyedsubscript:)"
---

# setObject(_:forKeyedSubscript:)

Sets the specified JavaScript property of the context’s global object, allowing subscript setter syntax.

## Declaration

```swift
func setObject(_ object: Any!, forKeyedSubscript key: (any NSCopying & NSObjectProtocol)!)
```

## Parameters

- `object`: The value to set for the JavaScript property.
- `key`: The JavaScript property name to use in the context’s global JavaScript object.

## Discussion

Discussion This method first constructs a JSValue object from the key parameter, then uses that value in JavaScript to set the property in the context’s global object. Use this method (or Objective-C subscript syntax) to bridge native objects or functions for use in JavaScript. For example, the following code creates a JavaScript function whose implementation is an Objective-C block: JSContext *context = [[JSContext alloc] init]; context[@"makeNSColor"] = ^(NSDictionary *rgb){     float r = rgb[@"red"].floatValue;     float g = rgb[@"green"].floatValue;     float b = rgb[@"blue"].floatValue;     return [NSColor colorWithRed:(r / 255.f) green:(g / 255.f) blue:(b / 255.f) alpha:1.0]; };

## See Also

### Accessing JavaScript global state with subscripts

- [objectForKeyedSubscript(_:)](javascriptcore/jscontext/objectforkeyedsubscript(_:).md)