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# decodeIfPresent(_:forKey:)

Decodes a value of the given type for the given key, if present.

```
func decodeIfPresent(_ type: Int16.Type, forKey key: Self.Key) throws -> Int16?
```

## Parameters

`type`

The type of value to decode.

`key`

The key that the decoded value is associated with.

## Return Value

A decoded value of the requested type, or `nil` if the
`Decoder` does not have an entry associated with the given key, or if
the value is a null value.

## Discussion

This method returns `nil` if the container does not have a value
associated with `key`, or if the value is null. The difference between
these states can be distinguished with a `contains(_:)` call.

> throws: `DecodingError.typeMismatch` if the encountered encoded value
> is not convertible to the requested type.

---

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