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# value(forKey:)

Returns an array containing the results of invoking [`value(forKey:)`](/documentation/Foundation/NSArray/value(forKey:)) using `key` on each of the array’s objects.

```
func value(forKey key: String) -> Any
```

## Parameters

`key`

The key to retrieve.

## Return Value

The value of the retrieved key.

## Discussion

The returned array contains `NSNull` elements for each object that returns `nil`.

---

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