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# localeIdentifier(fromComponents:)

Returns a locale identifier from the components specified in a given dictionary.

```
class func localeIdentifier(fromComponents dict: [String : String]) -> String
```

## Parameters

`dict`

A dictionary containing components that specify a locale. For possible values, see `NSLocale Component Keys`.

## Return Value

A locale identifier created from the components specified in `dict`.

## Discussion

This reverses the actions of [`components(fromLocaleIdentifier:)`](/documentation/Foundation/NSLocale/components(fromLocaleIdentifier:)), so for example the dictionary `{NSLocaleLanguageCode="en", NSLocaleCountryCode="US", NSLocaleCalendar=NSJapaneseCalendar}` becomes `"en_US@calendar=japanese"`.

## See Also

[`ISOLanguageCodes`](/documentation/Foundation/NSLocale/isoLanguageCodes)

The list of known language codes.


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