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# subscript(_:)

Returns the value associated with a given key.

```
subscript(key: any NSCopying) -> Any? { get }
```

## Parameters

`key`

The key for which to return the corresponding value.

## Return Value

The value associated with `key`, or `nil` if no value is associated with `aKey`.

## Discussion

This method has the same behavior as the [`object(forKey:)`](/documentation/Foundation/NSDictionary/object(forKey:)) method.

You shouldn’t need to call this method directly. Instead, this method is called when accessing an object by key using subscripting.

```objc
id value = dictionary[@"key"]; // equivalent to [dictionary objectForKeyedSubscript:@"key"]
```

## See Also

[`-  setObject:forKeyedSubscript:`](/documentation/Foundation/NSMutableDictionary/setObject:forKeyedSubscript:)

Adds a given key-value pair to the dictionary.


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