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# init(domain:code:userInfo:)

Returns an `NSError` object initialized for a given domain and code with a given `userInfo` dictionary.

```
init(domain: String, code: Int, userInfo dict: [String : Any]? = nil)
```

## Parameters

`domain`

The error domain—this can be one of the predefined `NSError` domains, or an arbitrary string describing a custom domain. `domain` must not be `nil`. See `Error Domains` for a list of predefined domains.

`code`

The error code for the error.

`dict`

The `userInfo` dictionary for the error. `userInfo` may be `nil`.

## Return Value

An `NSError` object initialized for `domain` with the specified error `code` and the dictionary of arbitrary data `userInfo`.

## Discussion

This is the designated initializer for `NSError`.

## See Also

[`errorWithDomain:code:userInfo:`](/documentation/Foundation/NSError/errorWithDomain:code:userInfo:)

Creates and initializes an `NSError` object for a given domain and code with a given `userInfo` dictionary.


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