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# init()

Initializes a JavaScript virtual machine.

```
init!()
```

## Return Value

A new, independent JavaScript virtual machine.

## Discussion

Use this initializer to create a virtual machine for use with more than one JavaScript context. By default, creating a [`JSContext`](/documentation/JavaScriptCore/JSContext) object automatically creates an independent virtual machine—to share a virtual machine between contexts, obtain a [`JSVirtualMachine`](/documentation/JavaScriptCore/JSVirtualMachine) instance and then create contexts using the [`init(virtualMachine:)`](/documentation/JavaScriptCore/JSContext/init(virtualMachine:)) initializer.

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