Contents

decodeIfPresent(_:forKey:)

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

Declaration

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

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.