C# Coding Solutions—Transformer Functor

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The Transformer Functor

Another type of functor is the Transformer functor. It takes one type as a parameter and uses a mapping to return some equivalent of the original type to a new type. The big picture idea behind a Transformer functor is to make it possible for a user to continue using one type that will be converted dynamically into another type. For instance, the Transformer functor is useful in the context of integrating a new system with legacy objects, or vice versa.

The following is the delegate definition of the Transformer functor:

public delegate outType
    DelegateTransformer<inpType, outType>(inpType input);

The delegate DelegateTransformer<> is a .NET Generics type with two parameters, where the type inpType is the input, and the type outType is the output that the input is converted into.