JSONAPI/Sources/JSONAPI/Resource/Attribute+Functor.swift

//
//  Attribute+Functor.swift
//  JSONAPI
//
//  Created by Mathew Polzin on 11/28/18.
//

public extension TransformedAttribute {
	/// Map an Attribute to a new wrapped type.
	/// Note that the resulting Attribute will have no transformer, even if the
	/// source Attribute has a transformer.
	/// You are mapping the output of the source transform into
	/// the RawValue of a new transformerless Attribute.
	///
	/// Generally, this is the most useful operation. The transformer gives you
	/// control over the decoding of the Attribute, but once the Attribute exists,
	/// mapping on it is most useful for creating computed Attribute properties.
	func map<T: Codable>(_ transform: (Transformer.To) throws -> T) rethrows -> Attribute<T> {
		return Attribute<T>(value: try transform(value))
	}
}

public extension Attribute {
	/// Map an Attribute to a new wrapped type.
	/// Note that the resulting Attribute will have no transformer, even if the
	/// source Attribute has a transformer.
	/// You are mapping the output of the source transform into
	/// the RawValue of a new transformerless Attribute.
	///
	/// Generally, this is the most useful operation. The transformer gives you
	/// control over the decoding of the Attribute, but once the Attribute exists,
	/// mapping on it is most useful for creating computed Attribute properties.
	func map<T: Codable>(_ transform: (ValueType) throws -> T) rethrows -> Attribute<T> {
		return Attribute<T>(value: try transform(value))
	}
}