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# isEquivalent(to:)

Returns a Boolean value that indicates whether this language and another language are equivalent after expanding missing components.

```
func isEquivalent(to language: Locale.Language) -> Bool
```

## Parameters

`language`

A language to compare equivalence with.

## Return Value

`true` if the two languages are equivalent; `false` otherwise.

## Discussion

The following example shows equivalence tests run on various ways of expressing the US English language, followed by a test against UK English.

```swift
let en = Locale.Language(identifier: "en")
let enUS = Locale.Language(identifier: "en-US")
let enLatn = Locale.Language(identifier: "en-Latn")
let enLatnUS = Locale.Language(identifier: "en-Latn-US")

let test1 = en.isEquivalent(to: enUS) // true
let test2 = en.isEquivalent(to: enLatn) // true
let test3 = en.isEquivalent(to: enLatnUS) // true

let enUK = Locale.Language(identifier: "en-UK")
let test4 = en.isEquivalent(to: enUK) // false
```

---

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